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Audio Amplifiers - techlib.com
http://techlib.com/electronics/audioamps.html
Modest power audio amplifiers for driving small speakers or other light loads can be constructed in a number of ways. The first choice is usually an integrated circuit designed for the purpose such as the LM386 or newer class D switching types …
High Fidelity Audio Amplifier - techlib.com
http://techlib.com/area_50/LowDistortionAudioAmp.htm
This low-distortion audio amplifier will supply about 5 watts into 8 ohms when configured as shown in the schematic. Power calculates to about 7.5 watts when driving a 6 ohm "satellite" speaker often left over from surround-sound systems. The total distortion measures to be only 0.015% at 1 and 5 kHz using an HP8903B audio analyzer.
Crystal Radio Circuits - techlib.com
http://techlib.com/electronics/crystal.html
Here is a simple audio amplifier using a TL431 shunt regulator. The amplifier will provide room-filling volume from an ordinary crystal radio outfitted with a long-wire antenna and good ground. The circuitry is similar in complexity to a simple one …
Audio Projects - techlib.com
http://techlib.com/electronics/audio.htm
Audio Projects Many audio projects should be approached with a bit of caution; It is usually illegal to record someone without their knowledge. Incidental recordings aren't usually a problem but intentional 'bugging' is a no-no. Simply listening when the subject has no 'reasonable expectation' of privacy is usually fine, but not necessarily, so ...
techlib.com - Technical Library
http://techlib.com/default.htm
1uV Noise Source for Audio: New Curiously Low Noise Amplifier: Precision Temperature Measurement: Synthetic Ground Generators: Spreadsheet Look-Up for Thermistors: Simpler Hi-Fi Audio Amplifier: Old Parts Lightning Detector: Emery's Inductance Meter: Robert's Magic Eye Radio: RF "Flashlight" Probe: Hi-Fi Audio Amp Redux: Popeye Power Distribution
Audio Oscillators - techlib.com
http://techlib.com/electronics/audiooscillators.htm
Audio Oscillators. Here is a phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm resistor to a point just below where oscillation stops.
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