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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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FILTER (ELECTRONIC) sa AUDIO FILTER sa LOUDSPEAKER CROSSOVER & FILTER sa Q MULTIPLIER sa RADIO FREQUENCY INTERFERENCE FILTER xx ELECTRONIC COMPONENT Op amps for audio. Part 3. Regulated power circuits (RC filter, voltage regulator, power supply). Build an A-weighting filter. Building a meter preamp to make measurements at very low (microvolt) signal levels using a vacuum-tube voltmeter, digital voltmeter, or oscilloscope. How to simulate electronic filters on your home computer and thus simplify the process of designing the correct filter for a specific application. An easy-to-use universal active filter IC and typical applications. Cut-off frequency formulas for identical cascaded RC filter sections. How to build a c.w. filter for the novice operator. Part 1. Est. cost: $15. How to build a c.w. filter for the novice operator. Part 2. Build a switched capacitor bandpass CW filter. Includes separate bandpass controls, a frequency control, and an output volume control. Some receiver design aids. Methods for employing simple two-section HF bandpass filters at the front end of any homemade receiver. Getting to know RF filters. Workings of harmonic filters and the advantages of using filters that are capable of "laundering" the transmitter output signal. Using inexpensive L and C components for constructing low-frequency IF filters with toroids. Filter eliminates spurious harmonic radiation from any low-power transmitter (under 100 watts input). Resistive-capacitive (RC) filters and applications. Inductive capacitive (LC) filters. How they work and typical applications. Active filters. Boost the performance of any resistive-capacitive filter by combining it with one or more operational amplifiers. Potpourri of circuits utilizing bipolar junction transistors. Circuits to amplify signals, filter high and low frequencies, generate white noise, flash lamps, etc. Understanding electronic digital filters. Designing a linear phase digital filter. Designing electronic frequency-selective active AC filters. Looks at low-pass, high-pass, band-pass, and notch filters. Special section on electronic filters. Explanation of the new Piezoelectric or mechanical IF (intermediate frequency) filters and how to use them. Get in the swing of simple filters. A review of filter theory written for the hobbyist. Instructions on designing and making your own filters. Getting filter design to come easy. Novice hams may want to install a CW filter on their receivers to improve selectivity. Some tips. Electronic fundamentals. Resonance and filters. Ripple Suppressor circuit reduces AC adaptor ripple of 450 mV down to less than 5 mV. E-Z math (for electronics). Low and high pass filter design. A universal active filter. Circuits utilize a Motorola MF10 switched-capacitor active filter which may be configured to handle any of the four basic filter rolls (bandpass, notch, lowpass, and highpass). Using op amps. Practical applications of the ubiquitous op amp as an amplifier, a filter, and a limiter. Designing active filters. A short-cut method for practical design of first-through-third-order active filters. Part 1. Filter basics and how to design first-order active filters. Designing active filters. Part 2. Second- and third-order filters. Active-filter circuits which use Linear Technology's LTC1062 active-filter IC. Switched-capacitor filter ICs. Includes circuits for a fourth-order Chebyshev bandpass filter, low-pass filter, and a notch filter. Passive wave-shaping circuits. Using resistors, capacitors, inductors and diodes to do a job that has traditionally been the task of op amps and other active elements. Using sweep frequencies in electronics troubleshooting. This technique greatly reduces the time needed to trace a fault to a particular component in a circuit. Looks at RC filter characteristics and how to read and interpret abnormal filter frequency-response curves. Deep-notch resonate filters. Practical advice for designing these extremely useful electronic filter devices. Output filters for SWB reception. Tips on selecting and using a filtering system between a SWL receiver and a good comfortable headset. Figuring out filters. Advice on the selection and use of optional filters and outboard filtering devices to improve DX radio reception. Mechanical filter sharpens bandwidth for optimum reception of AM, CW, SSB, and CB. Impulse noise suppressor can be added to any SWL, Ham or CB receiver. Single-frequency filtering method, called digital filtering, uses no critical elements and operates from a digital oscillator. Active filter sharpens CW reception. Provides 6-dB selectivity of less than 100 Hz. Uses an op-amp in the circuit. Est. cost: $15. Experimenting with phase-locked loops. Circuits include an ultrasonic switch, tunable filter, touch switch, and SCA decoder. Circuit for a decoupling filter uses the NSL4944 Universal LED. Circuit for a high-pass TV filter for use with 75-ohm coaxial lines. Understanding active filters. Using op-amps makes filter design easy and low cost. How to design high-pass, low-pass or band-pass frequency selective filters. Clipper circuit filters out bursts of noise caused by atmospheric and power switch noise interference. The clipping threshold is adjustable. Active filters. Includes a practical circuit for an active band-pass filter using an op amp and a discussion of bandpass design equations. Circuit for a fifth-order, high-pass filter with a cutoff frequency of 25Hz and a rolloff of 30 dB per octave. Filter analyzer circuit is used with an oscilloscope to display the filter's frequency response. An introduction to filter circuits (a frequency-selective electronic network that alters the amplitude and/or phase of an electronic signal). Filters for QRM radios that can help prevent overload from local AM and FM broadcast stations. Two circuits shown. Notch filters. How to eliminate unwanted frequencies from circuits, or dislodge unwanted in-band signals from frequencies, by using a narrow bandwidth version of the bandstop filter. Audio testing accessories. (1) High-power load bank. (2) IHF-standardized reactive load. (3) Pinking filter. (4) Step attenuator for input signals. (5) RIAA-Equalization inverter. (6) Input/output loads. How to design high frequency analog filter circuits. How to design analog filter circuits of both active and passive types. Resonate circuit design. A generic BASIC program for technicians and experimenters who work with RF circuits or RF filters. Will calculate the frequency, capacitance and inductance values for a resonate circuit and then go on to calculate the design of an air-wound coil. Comb filters for your TV. Learn all about comb filters, how they work, and how they can be used to improve the performance of your video system. Part 1. Comb filters for your TV. Part 2. Build a highly effective FM notch filter from a section of coaxial transmission line. Use it to screen out a local FM station so you can pick up a remote station very near the same frequency. Basic design concept of a helical resonator trap. Circuit for (1) an active bandpass filter that can be used to drive the midrange amplifier of a tri-amped three-way speaker, and (2) a subsonic filter to eliminate turntable rumble and tape-recorder flutter. Both circuits use SGS Semiconductor Corp's TDA2320A stereo preamplifier IC. Working with op-amps. Circuits included for both inverting and non-inverting amplifiers (both AC and DC), voltage followers, audio mixer, adders and subtractors, phase-splitter, and active filters. State-variable active filter circuit provides lowpass, bandpass, and highpass outputs. Electronic filter fundamentals. (1) Passive filters. (2) Active filters. (3) Other filter types. | |||||||||
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