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Last Updated
03/31/2019
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WELCOME to the Web version of the Index To How To Do It Information . The Index To How To Do It Information (HTDI Index) was created to aid public and college libraries in locating how-to articles in magazines to which they subscribe. Therefore, you must contact your local public library to see if they have the issue referred to by the index within their magazine collection or will secure a copy from another library. Also ask your librarian to provide you with the current address of the publisher of the magazine and check to see if the publisher can provide a copy of the article. In November 2012, the magazine collection accumulated by Norman Lathrop Enterprises and itemized in the UNION LIST was donated to the Akron-Summit County Public Library (60 S.High St., Akron OH 44326). For a fee, they may be willing to provide a copy of most articles cited in the HTDI Index. Contact them at 330-643-9075 or online at www.akronlibrary.org. New visitors to this site are encouraged to take a few minutes to read the Introduction, Organization, and Past & Future pages. Access to the Web version of the Index To How To Do It Information (HTDI) is being made freely available to individuals and institutions subject to the understanding that the entire HTDI Index is a copyrighted work and all rights are reserved to Norman Lathrop Enterprises (2342 Star Dr., Wooster OH 44691). The contents of this database, in whole or in part, may not be offered for sale by anyone except Norman Lathrop Enterprises. Online users of the HTDI Index are subject to monitoring by NLE using statistical and analytical programs. Access to the online version of the HTDI Index is offered solely at the discretion of Norman Lathrop Enterprises and access is not guaranteed to continue. The following two book formats of the Index To How To Do It Information are considered to be the only archival versions. |
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CURRENT REGULATOR sa VOLTAGE REGULATOR x AMPERAGE REGULATOR x REGULATOR (CURRENT) xx ELECTRIC xx ELECTRIC POWER SUPPLY xx VOLTAGE REGULATOR Circuit schematic for a constant current source. Constant-current regulator. Build a low-cost version with two ranges (0-40mA and 0-400mA) and ways to use a constant-current regulator. Circuit for an electronic load resistor that can be preset for any current desired (0 to 10 amperes) over a voltage range (1.2 to 50 volts). Allows only that pre-set current to flow through. Inrush current limiter. Protect sensitive electronics from startup power surges with this stand-alone or embedded soft start circuit. Simple circuit to "float charge" a 12-volt battery (or to power a heavy load that operates intermittently, such as a ham radio transmitter) uses two 12-volt 1-amp light bulbs as current limiters. Using the constant-current source (CCS), a circuit that will sink or source the same current regardless of changes in load resistance or power supply voltage. Safe transformer sleuthing. This current-limiting circuit combined with a Variac provides a safe way to track down the primary leads to a transformer. Current limiter circuit is adjustable from 0.5 to 8 mA and can be used with circuits having supplies ranging up to 30-volts. Can be modified to handle current from 5 mA up to 200 mA. Electronic overload protection. Current limiter for your semiconductors. Adjustable for 10 to 100 mA. Current-limiting techniques. How to protect power transistors from overload damage. Voltage regulator applications. (1) In-rush current limiter circuit keeps current at the rated operating level of the device to be protected. (2) Visible-light transmitter circuit. (3) Visible-light receiver circuit. (4) Using two common voltage regulators to vary both voltage and current. (5) Circuit to control a small DC motor or small lamp. All about current-crowbar circuits which can shut down a power supply if a preset current value is exceeded. Four circuits shown. Precision current source is used to test LED's, laser diodes, Zener diodes, and bipolar transistors. Incandescent-lamp life-extender circuit works with lamps that operate from 1.5 to 12 volts and a current of 1 amp or less. It works by controlling the maximum current getting to the lamp. Simple single-transistor circuits. (1) Voltage regulator outputs 6-volts DC. (2) Constant-current output. (3) Simple audio amplifier. (4) Impedance-matching circuit. (5) LED-control circuits turn either off or on in the presence of a DC voltages from 5- to 9-volts. (6) Relay-driver circuit has a latching feature that keeps the relay on once energized. How to use adjustable or programmable DC power supply (voltage) regulators to control current instead of voltage. | |||||||||
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