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ELECTRIC POWER SUPPLY sa AUDIO AMPLIFIER POWER SUPPLY sa AUDIO PREAMPLIFIER POWER SUPPLY sa BATTERY sa BATTERY ELIMINATOR sa COMPUTER POWER SUPPLY sa CURRENT REGULATOR sa PHOTOVOLTAIC DEVICE sa RECTIFIER sa TRANSFORMER (ELECTRIC) sa UNINTERRUPTABLE POWER SUPPLY sa VACUUM TUBE POWER SUPPLY sa VOLTAGE & CURRENT CALIBRATION sa VOLTAGE CONVERTER sa VOLTAGE DIVIDER sa VOLTAGE MONITOR sa VOLTAGE MULTIPLIER sa VOLTAGE REGULATOR x POWER SUPPLY (ELECTRIC) xx ELECTRIC A family of regulated and current-limiting power supplies. Crowbar protection for power supplies. Power supply design software. BASIC language computer programs for (1) determining the transformer specifications to meet your DC voltage and current requirements and (2) calculating the DC output voltage and current of a specified transformer when operating a given load. Try synchronous rectification. A technique that replaces diodes with power MOSFETs in low-voltage, high-current power supplies. Solid-state power supply uses no transformer and can deliver up to (+/-) 15 volts when powered by a 5-volt supply or battery. Cyber Supply. Get precise volts from bench power supplies. Interface lets you digitally control a linear bench-type DC power supply to produce precise voltages in 100- or 50-millivolt increments (up to 2 amperes current). Est. cost: $70. A tiny switching power supply is designed to output +12 and -5 volts from a single 5-volt DC source. Ideal for use with many analog ICs. An adjustable, regulated, high-current DC power supply uses the LM317 and LM350 IC chips. The unit delivers 1.2-15 v.d.c. at up to 3 amps. A voltage-regulated, high-current 13.8 volt power supply that allows a 12-volt d.c. 2-meter amateur radio to be operated from 110-volt a.c. The Blockbuster. A simple variable lab power supply. Delivers 0-10 v.d.c. at 3 amps. Lab quality power supply features preset and variable output. Use it to power or charge Handi-Talkies or as a well filtered d.c. power supply. Bargain priced transceiver power supply will run a 200 watt PEP h.f. transceiver drawing a continuous 15-20 amperes. Est. cost: $23. A heavy-duty bench power supply delivers 13.8 volts at 5 amperes continuously (10 amps intermittent). Doubles as a transceiver power supply. A low-voltage breadboard power supply. Features an adjustable positive voltage, adjustable negative voltage, and 12 v. fixed voltage. Works in the range 0-15 volts at 0.5 amps. Regulated power supply uses the LM317 and UA7912 regulators. Provides 0 to +20 VDC and a fixed 12 volts negative. Flea market special. A bare bones 0- to 15-Vdc regulated power supply you can build from readily available surplus parts that will deliver up to 20-amperes. Unique power-supply chip from AT&T produces a regulated output of 5 to 24 volts DC from almost any 15-to-275 volt AC input. Tips on its use. The new 3.3 volt power supply standard for portable, battery-powered PCs and wireless equipment. DC power supply filtering schemes to eliminate AC ripple from the DC output. Three approaches illustrated. Well-regulated, modular, laboratory-grade power supply with dual DC supplies (0-50 volts, 0-5 amperes) and a single 5-volt, 3-amp DC supply. 5-volt power supply will provide voltage-regulated power for digital ICs needing up to 500 mA. Variable power supply circuit (0-12 volts DC, 1 ampere filtered output). Est. cost: $19 (kit). Regulated power supply (13.8-volts DC, 2 amperes) operates from 120-volts AC. Est. cost: $25 (kit). Configurable power supply will suit any device in need of 1.2- to 33-volts DC at up to 1.5 amps. Triple voltage power supply costs $10. Variable DC supply gives up to 30 volts at 500 ma. Multi-purpose bench power supply uses an IC regulator. Build either a 17-volt or 38-volt version, delivering up to 200 ma. A programmable laboratory-grade power supply for use with integrated circuits limits current and voltage supplied to the test circuit. Output from zero to 60 VDC within 0.001 v of the desired value. Est. cost: $60. Variable, high-voltage, bench top DC power supply. Build a 0-250 volt, 100-milliamp regulated power supply with short-circuit protection and output impedance of 15 ohms. Triple-output DC power supply. Adjustable (+/-)1.3-volt to (+/-)20-volt supplies (complete with meter and vernier controls) and a fixed 5-volt logic supply. Variable output up to 200 milliamps and fixed output to 300 milliamps. Constant DC voltage supply circuit can provide more than 5 amperes at two switchable current limits. Power supply regulation. Learn the strengths and weaknesses of the two principal off-line power supplies (linear-regulated and switching-regulated). Simple circuits for negative and positive 5-volt regulators and a bipolar power supply. Off-line linear voltage regulators. Includes instructions for building two miniature power supplies: (1) Adjustable DC output of 8 to 12 volts up to 100 milliamperes. (2) Precision 5-volt DC output. Handy hobby power supply provides both fixed (+5-volt) and variable DC outputs. Input can be either 7- to 20-volts AC or 7- to 30-volts DC. Est.cost: $19 (kit). Versatile bench power supply offers five different output voltages (+5, -5, +12, and positive and negative variable sources between 1.2 and 28 volts). Circuit for a positive/negative 12-volt regulated power supply which uses 7812 and 7912 regulators. Switching-mode power supplies. A closer look at the fundamentals of design and operation. Four essential test instruments. DC power supplies, function generators, bench digital multimeters, and frequency counters. An examination of their applications and key features. Tip on using old PC power supplies to power experimental digital circuits. All about switching power supplies. Two charts and a table simplifying design of transformerless DC power supply useful in many low current applications. A continuously variable low-voltage power supply. Delivers up to 20 volts with no load and up to 12 volts with a 500-milliampere load. Special section on power supplies. Design of an 11- to 32-volt, 700 mA power supply which has good regulation and built-in overcurrent protection. Design and construction of regulated supplies. Uses inexpensive non-critical parts. Universal regulated power supply. Most components are from a discarded TV chassis. Improvement to a typical solid-state regulated power supply circuit. Simple +9-volt power supply circuit for transistorized circuits. Special issues on commercial power supplies and design considerations. Circuit for a preamplifier power supply requiring 125-135 volts DC at 7 mA and 6.3 volts AC for the filament of a 6CB6 tube. Regulated DC supply from 150 to 400 volts with 1% or better regulation. Maximum current is 120 mA. Est. cost: $32. A basic primer on power supplies. Duo-Reg, a bipolar, adjustable, regulated power supply to power your IC and other solid-state circuits. Can be made capable of producing up to 600 mA output at (+ or -) 20 volts or (+ or -) 40 volts. Let's look at power supplies. How they work. A 9-volt regulated power supply at 250 mA. A designer's bipolar power supply uses IC technology to deliver 15 volts DC (+ or -). Output will not vary more than 0.004 volts if input is anywhere between 100 and 135 volts. Est. cost: $20. Professional power supply for hobbyists has the following features: 20-watts of output power, adjustable current limiting (0.1 amp to 1.0 amp), 0.5% regulation, adjustable output voltage of 0.6 to 30 volts, and short circuit protection. Est. cost: $35. Hobbyist power supply for TTL. A steady five volts is provided by this ultra-simple, high performance regulator. Output current is automatically limited to 1 ampere. Built-in short circuit protection turns off supply. A power supply offering +5, -15, and +15 volts is housed in a metal cabinet. With QT (quick test) sockets mounted on top of the cabinet, the unit becomes a flexible "breadboard" system. Has built-in fuse protection. Est. cost: $50. Antique radio power supply is suitable for operating the filaments of antique vacuum tubes. This unit can supply from zero to 13 volts DC, at currents up to 1.5 amperes. Also suitable as a general bench supply for transistorized car radios and can be used as a battery charger. Mini-Reg, the regulated IC power supply. Continuously adjustable from 3.4 to 15-volts DC and delivers up to 500 miliamperes. It is short-circuit proofed and features adjustable current limiting. The smart power supply delivers a regulated 5 and 8-volt output at up to 1-amp. LEDs show you how much current is currently being drawn (.25, .50, .75, or 1.0 amps). Est. cost: $20. Designing regulated power supplies. Includes basic design schematics along with charts of fuse sizes and commonly used transformer and regulator combinations for both positive and negative supplies. Restoring power supplies on vintage (antique) radios. Test bench power supply for vacuum tubes. This high-quality, adjustable supply can output voltages of more than 500V DC, but incorporates many safety features and is short-circuit proof. A high quality vacuum tube voltage regulator. Build a prototype power supply that features a 250V feedback-type regulator. Vacuum-tube regulator design. Circuits for regulators with 250-600V outputs which are varied over only a small range. The amount of current supplied can be any reasonable amount. Advice on choosing voltages and tubes. Electrolytic capacitor reforming unit which can also be used as a current-limited high-voltage DC power supply. The power line interface. This article takes you through the AC line interface of a typical piece of audio equipment. Provides practical suggestions to achieve optimum performance and safety in anything you build that plugs into the wall. Dual power supply. Construct a bench-top supply which is adjustable down to zero volts without loss of regulation and has a snap-action, current-overload protection circuit. Delivers 0- to 20-volts at 400-mA maximum. Designing practical DC power supplies. Engineering concepts and theory related to rectifiers, filters and regulators. Electrical safety tips when designing and building electronics projects that are powered by 117-volt AC line. Low-power polarity inverter circuit utilizes the multi-purpose 555 timer integrated circuit. Power supply balance indicator. Three LED's indicate when the positive and negative levels of a split power supply are within 1% of each other. Schematic for a power supply to provide both positive 9-volts and negative 9-volts. Dual-polarity power supply circuit. Supplies up to 200-mA of negative voltage from a 5-15 volt supply. Antique radio. Tracking down that uncontrollable hum. Problems with power supplies and filter capacitors in old radios. Antique radio. Starting up those old AC sets. Build this variable power-supply "start-up control console". It features an AC-voltmeter, DC ammeter, transformer tap switch, charging rate rheostat, etc. Using op-amps in power-supply circuits. Experimenting with op-amp power-supply circuits promotes a deeper understanding of op-amp applications. Alter the output of your power supply by adding a voltage doubler, voltage inverter, and/or voltage multiplier. Three circuits shown. Universal power supply can be tailored by plugging in the right components. The printed-circuit layout allows either individual diodes or an epoxy-packaged bridge rectifier to be used. Power Play. This universal power supply can output from 0-25 volts and provide up to 1 ampere of current, plus a negative voltage whenever needed. Incorporates a digital display to check voltage and current levels. Circuit built around the 7805 5-volt regulator can power low-current (1 amp or less) 5-volt circuits, such as TTL or CMOS based projects. Power supply circuit is capable of converting a positive 12- or 15-volt source to provide a negative 5.2-volt output, while delivering 0-50 mA of current. Design and build your own power supply. RF power cell circuit uses operating power generated by an antenna to power a crystal radio, transistor radio, etc. BASIC computer program for the PET computer will draw (design) the schematic for a power supply from 1.2 volts to 25 volts and load currents up to 5 amperes. The computer (or you) can specify the transformer. Construct a modular, multi-purpose power supply with fixed 5V and variable +/-22V output at 1.5 amps. How to use a bulb in the power supply leads to control the amount of current fed to an IC project. By controlling the amount of current fed, you may be able to prevent damage to ICs which are wired up incorrectly. Universal power supply for solid-state electronics. Provides 5-volts or 12-volts at up to 1 amp. Other output voltages can be achieved by changing regulators. Schematic shows how to convert a Radio Shack #22-124 regulated 12-volt supply to a regulated variable supply providing from 1.2 to 12-volts output. How to design and construct power supplies for your electronic projects. Includes schematics and circuit board pattern for a dual polarity, standard power supply which can deliver +/- 5-volts, 8-volts, 12-volts etc. depending upon components selected. Est. cost: $8 (less transformer). Circuit for adding a meter to a power supply to measure the output up to 15-volts. Schematic for a variable power supply which can deliver zero to 120 volts at about 4 mA. Supply is used in connection with a laser diode circuit, and can operate up to the 10 mA load range. Designing DC power supplies. Step-by-step procedure describes how to design the fixed power and adjustable power supplies you need for solid-state applications. An experimenter's multi-voltage power supply. Designed to provide all the voltages required by modern IC circuits. Offers simultaneous outputs at plus and minus 15, 12, and 5 volts. Power supply for an EPROM burner. Circuit for a switching dc-to-dc converter to boost +5-volt input up to +12, +21, or +24 volts. Est. cost: $5. How to design a filter capacitor for a power supply. Designing power supplies with switching regulators. IC switching regulators simplify design, increase efficiency and reduce size. AC-to-DC conversion. How a power supply really works, regulators you can build, and a computer program to aid design. Dual-polarity power supply project is adjustable from 1.2 to 37 volts (+/-) and has a built-in digital-numeric metering system that can be used to monitor output voltage or current. Variable-load box and power-transistor tester. Lets you check the regulation and set current limits of your DC power supply. Also checks the operating condition of npn and pnp bipolar power transistors. A laboratory-grade low-voltage DC power supply offers two output voltage ranges (0-to-150-millivolt and 0 to 9 volts) up to 2 amperes of current, is short-circuit protected and can go all the way down to 0 volt. Power supply for IC experimenting. An AC-operated transformerless DC power source that can be used for powering small, low-power circuits and projects. Delivers approximately 50 milliamperes at 5-volts or 12-volts. Universal power supply outputs from 5- to 15-volts DC at up to one ampere. Adapter cables make it easy to connect the power supply to a variety of devices. Light-controlled power supply goes from 0 to 25 volts. Est. cost: $13. High wattage reducer. Low voltage tap on high voltage bench supply powers transistors. Well-filtered, regulated semiconductor supply for transistorized equipment. Electronic power supply regulator. Shock-proof your power supply. Light-controlled power supply featuring either constant current or constant voltage. Schematic for transformerless transistorized power amplifier. Compaction regulated power supply (in the 150 to 250 voltage range) uses one tube. Circuit for extracting 9- to 12-volts from a 6.3-volt transformer to power transistor equipment. Learning to stack silicon diodes to get all the power supply voltage you need. Build a fail-safe transistor power supply. Circuit for low-cost, line-operated, half-wave power supply. A 15-watt, 50 mc. RF power amplifier circuit driven with 1-watt signal. Uses npn silicon power transistor. Circuit may be modified for other frequencies and power levels. Multi-purpose Sylvania-designed power supply circuit has a rating of 250 volts, 400 cycles, when used with 25 ma, 20% power factor capacitive load. Experimenter's "professional" power supply. Adjustable 0 to 10 volts DC. Adjustable 0 to 500 mA. Short circuit proof. Est. cost: $15 to $30. Experimenter's short-proof power supply will deliver 0 to 32 volts and 10 mA to 2 amperes, continuously variable. Est. cost: $36. A 3.6 volt power supply that will deliver up to 1.5 amps. Ideal for use with integrated circuits because it is very stable and will run cool even when operating 24 hours a day. Built-in ammeter. Circuit for a variable DC power supply will supply to 12 volts at currents up to 300 mA. Adjustable AC power supply uses an inexpensive Variac. Description of an integrated circuit that can be connected to the output of an unregulated power supply and make it perform like more expensive lab equipment. Est. cost: $5. Laboratory integrated circuit power supply delivers 0 to 20 volts at 0 to 2 amperes. Est. cost: $50. Precision lab power supply delivers up to 30 volts and 1.2 amperes of regulated power. Est. cost: $80. Simple adapter converts 6-volt lantern battery into RTL 3.6-volt integrated circuit power supply. Est. cost: $5. Slow turn-on circuit protects power supply. Build the little giant power supply. One IC makes blow-out-proof selectable voltage supply. Provides 5,6,8,12, or 15 volts DC at currents up to 1 ampere. Est. cost: $17. High-quality bench power supply has a regulation better than 0.06%. Select voltage of + or - 9, 10, 12, 15, and 20 volts with a current limit of 10 mA or 100 mA. Est. cost: $50. Insert some resistance onto a solid-state power supply circuit so that it turns on slowly and does not blow the rectifier. Circuit for a low-cost general purpose bench supply that can deliver between 5 and 16 volts at up to about 2 amperes. Three-way bench power supply. Two 0-15 volts at 750 mA are completely isolated. A third supply will go to 50 volts at 1 ampere. Circuits for two supplies. (1) A voltage-regulated DC supply usable from 3 to 25 volts. (2) An adjustable-current DC supply usable as a battery charger or speed control and power source of battery-operated toys. Experimenters power supply outputs 0- to 30-volts. It has a split output to provide both positive and negative supplies. Voltage regulation is 0.05% in worst-case conditions. Circuit for a 5-volt power supply for experimenting with TTL's. How to design your own power supplies. Following a step-by-step procedure, you can build a line-operated, professional power supply to your personal requirements. Building-block approach starts with the power transformer/rectifier/filter system that is basic to all line-operated systems. Circuit for a regulated output covering 50 to 200 mA with a 50 V input. Using diodes in power supplies. Design considerations when building power supplies. Build a preregulated power supply. It uses two inexpensive 723 voltage regulator IC's in a circuit that can deliver 3 to 35 volts dc at load currents up to 3 amperes. There is no need for massive heat sinks or cooling fans. A "junk-box" 5-volt power supply. Discrete circuit made from spare parts gives IC-regulator performance. Protecting your power supply from shorts, overloads, etc. How to control the transformer's primary circuit and the removal of base drive from a transistor in series with a load. Insert some resistance in series with capacitors (or use the circuit shown) to eliminate power surges when electronic equipment is first turned on. Full-protection power supply protects both itself and the load against overloads and short circuits. Uses a 723 integrated circuit which can be programmed to automatically drop the output current to a small fraction of maximum under overload or short circuit conditions. How switching regulators can be used in power supplies to lower heat loss and keep costs down by eliminating the need for cooling fans and/or large heat sinks. How to design and build power supplies. Part 1. Basics of transformers, rectifiers, filters, voltage regulators and protection circuits. How to design and build power supplies. Part 2. Some typical circuits including (1) 8-volt, 15-ampere for S-100 computer bus, (2) 5-volt, 4-ampere regulated supply, (3) 12-volt, 1-ampere supply and (4) 5-volt, 10-ampere supply. A simple precision power supply for your workbench. Delivers from 1.25 to 33 volts at up to 1.5 amperes with excellent regulation. Protection circuit senses any sudden increase (or decrease) in power supply output voltage and automatically shuts off power supply to regulator. Modify an HO power pack to include filtering and a means of varying the output voltage and you will have a simple variable-voltage power supply for electronic experimenting. Power supplies for operational amplifiers. Seven schematics shown. Circuit for a dual-polarity five-volt power supply is suitable for TTL, low-power Schottky TTL, op-amps, MOS and CMOS. Regulated power-supply circuit provides 6-, 9-, or 12-volts DC. Selection of the appropriate regulator devices (IC's) is discussed. Variable AC power supply circuit. Optional circuit can be added to provide a variable DC output. Designing power-supply circuits. Explains the principles of PS operation and construction using practical circuits as examples. Also covers limitations, safety practices, and interesting features. Transformerless DC power supply uses "scoop" capacitors. Delivers from 3.2 to 43.5 volts DC at currents ranging from 31 to 322 mA. Variable 10-amp unregulated AC/DC power supply also serves as a "universal" 1.5 hp AC or DC motor-speed controller. Choosing and using three-terminal voltage regulators. How they work, how they are used, and how to select the right one for a project. Includes several power supply circuits. Versatile unregulated dual-polarity DC power supply circuit has a potentiometer to vary the output voltage level. Power-supply circuit uses an LM317 regulator. Universal three-terminal power supply circuit. Can be configured to provide either positive or negative voltages; full-wave, full-wave bridge, or half-wave rectification; and can be fed from a single-winding, dual-winding, or center-tapped transformer. Fits into a 1"x2" space. Variable AC power supply circuit for a test bench utilizes a variable transformer. Build a 1.25- to 33-volts laboratory power supply with two variable outputs (one positive and one negative). Add precision potentiometers to control output to 1/100 of a volt. Experimenter's test-bench dual-polarity, multi-voltage power supply delivers 12, 8, and 5 volts, both plus and minus. Versatile circuit can be used to test Zener diodes or act as a stand-alone power supply. Inexpensive, configurable power supply will supply from 1.2 volts to 33 volts at up to 1.5 amps. Circuit for a simple dual (+/-) 15-volt unregulated power supply. Short-circuit protector for a regulated-DC power supply. All about current-crowbar circuits which can shut down a power supply if a preset current value is exceeded. Four circuits shown. Regulated power supply circuit is reliable, flexible, cheap and uses spare or recycled transistors. Simple, dependable circuit for a 12-volt DC power supply. The Crusher. Build a variable voltage (1.26 to 30-volt), high-current (5-ampere) power supply that is useful when testing or using ham radio gear. Dual-polarity low-current 9-volt power supply (for use with op amps, etc.). Build a versatile bench top power supply. Outputs between 5- and 15-volts DC up to one ampere. Output can be varied linearly or switched to specific levels. Using digital panel meters to enhance the look and performance of your next project. Circuits include: (1) AC power supply, (2) DC-to-DC supply, (3) DC ammeter, (4) automobile voltage monitor, (5) digital DC voltmeter, and (6) low-ohms meter. Op-amp applications. (1) CMOS-interface driver, (2) dual-voltage supply, (3) AC amplifier, (4) adjustable comparator, (5) dual-voltage comparator, (6) four-level voltage detector, and (7) voltage window. 15-volt DC power supply that requires only a 12-volt transformer. Circuit for a separate power source (+8 to +20 volts) to isolate one sensitive circuit from interfering with another. A simple and efficient overload-protected power supply circuit for DC voltages up to 22 volts. Circuit generates pulsating DC using four diodes and a plain transformer. Transformer-less DC power supply is equipped with a bridge rectifier to double the output current and cut the ripple voltage. Circuit for a 9-volt, dual-polarity unregulated DC power supply with current levels up to 100 mA (1 amp at reduced output voltage). DC power supply circuit, driven by an automobile battery, can provide regulated voltages from 4.5 to 13 volts with output currents up to 3 amps. Ideal for powering a handheld ham transceiver in your car. (1) Full-wave dual-polarity power supply circuit. (2) Half-wave dual-polarity power supply circuit. Build a zener regulated power supply. Features continuously adjustable output, from 0 to 15 volts DC at 1 ampere, electronic filtering and regulation, very low ripple output, and dual meters monitoring voltage and current output. Pulse-width modulated DC power supplies for TV's and how to troubleshoot them. Points to consider if you want to use a power supply voltage different than the one called for in a particular project. Schematics of typical hobby supplies are shown. Technology today. All about switching power supplies. Part 1. Technology today. All about switching power supplies. Part 2. Two regulator IC's and practical circuits designed around them. A switch-mode power supply controller IC (Signetics NE5561). What it does and tips on it's use. Tips on designing voltage regulators and power supplies. Increasing the current-handling capability of regulators found in power supplies. More about power supply regulators. Circuit to generate a negative supply from a two terminal transformer. Circuits for a variable power supply that can deliver 0 to 18 volts d.c. in two ranges. How to design power supplies for analog circuits. All about unregulated and regulated power supplies, IC regulators, and overvoltage-protection circuits. Circuit for a negative-voltage supply uses a 555 timer IC. How to generate both positive and negative (bipolar) voltages from one nine-volt battery. All about power-supply circuits. An in-depth look at practical power supplies and voltage regulators. Phantom power circuits. How a supply voltage for a device can be carried along the same line with the signal. Building a simple power supply to operate a 24-volt, 2-amp DC motor from 117 VAC. A simple solution to power-supply ripple (noise). Versatile bench power supply. Six-output supply includes two variable, precision voltage-reference outputs among the three pairs of complementary voltage sources supplying up to 100 ma of current. Switching power supplies. How to design switching power supplies. Theoretical background and several experimental circuits. Circuit for a power supply that delivers +/- 9-volts. Computerized power supply component selection. Computer program, written in BASIC, helps you select the correct transformer, diodes and capacitors for a linear type of power supply. Versatile bench top power supply provides any voltage between 3 and 30 volts, at any maximum current less than 1000 mA. Also includes short-circuit protection, load switching, and switchable voltage/current metering. Est. cost: $50. Transformerless 5-volt DC, 100-mA regulated power supply is built around the new MAX600 IC. Computer-assisted regulator design. Computer program, written in BASIC, selects power supply components to provide well-regulated voltages. Power supply circuit that will generate a variable supply with a 12-volt ceiling and up to 2 amps current draw. Op-amps show their versatility in instrumentation circuits. Includes circuits for rectifier, peak detector, AC/DC converter, voltmeter, ammeter, ohmmeter, voltage reference, and power supply. How to pick the correct value of ripple-filter capacitance for a line-operated power supply. Universal laboratory-grade power supply. Well-regulated supply features modular construction, dual 0-50 volt, 0-5 amp DC supplies and one 5-volt, 3-amp DC supply. Simple circuit to give both 1.2- to 12-volts DC (variable) and 5-volts DC (fixed) voltages when powered from another 12-volt supply. Generic linear power supply board can deliver two fixed-positive or one fixed-positive and one fixed (or variable) positive (or negative) voltage. Rugged 5-volt, 5-amp test bench power supply circuit based on the 78-series of voltage regulators. Inside switching power supplies. Part 1. Learn the basics of switching regulators. Inside switching power supplies. Part 2. An in-depth look at two switching regulator IC families, some applications, and basic troubleshooting techniques. Test bench power supply. A variable DC supply with 0 to 15 volts at 1 ampere with less than 2% ripple at full load and better than 3% regulation from no load to full load. Est. cost: $20 Theory of the Zener diode and how to design your own Zener diode-controlled power supply. Experimenter's QV power supply. Designed for either tube or transistor experimenter circuits. Provides B-plus voltage between 125 and 175 VDC up to 40 mA. Filament supply of 6.3 VAC at approximately 1 A. Regulated 6 VDC up to 40 mA. Circuit for a power supply with a 110-volt AC input and a 6- or 12-volt DC output, at up to 3 amps. Universal regulated power supply for solid state devices. A 10-volt output at a maximum of 300mA that is both voltage and current regulated. Modular test instruments. Part 1. Build your own voltmeter boards and power supply boards which will be incorporated into other instruments. | |||||||||
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