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Audio Amplifier Output Relay Delay - This is a simple circuit which I built
to one of my audio amplifier projects to control speaker output relay. The
purpose of this circuit is to control relay which turns on speaker output
relay in audio amplifier. The idea of circuit is wait around 5 seconds
after power up until speakers are switched to amplifiers....
(added 11/05) |
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Audio Auto Shutoff - The purpose of this circuit is to automatically turn
off any device plugged into its power outlets after a certain period of time. Shutoff
is activated by an absences of an audio signal or by a standard timer function.
This unit would be connected to speaker terminals of a stereo system, tape outputs, TV
earphone jack or audio outputs etc. Once the audio signal drops below a predetermined
level a …. [Randy Linscott] |
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Audio Detector Circuit - (diagram added 2/07) |
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Audio Graphic Equaliser - Simple 7 band eqalizer (diagram added 2/07)
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Audio Level Meter - Audio levels can be monitored using a small panel meter
with this circuit built from discrete components. The circuit has a flat
frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for
a full scale deflection on a 100uA meter. Built on two common emitter amplifiers, the
first stage has a preset resistor which may be adjusted for a FSD. The last stage is
biased to operate at roughly half the supply voltage for maximum ac voltage swing.
Audio frequencies are passed through the 10u dc blocking capacitor and the full wave
bridge rectifier converts the signal to a varying dc voltage....(schematic design
added 01/2010) |
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Audio line isolator - (electronic circuit added 2/07) |
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Audio Line Isolator #1 - (electronic circuit added 1/03) |
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Audio Line Isolator #2 - (electronic schematic added 8/02) |
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Audio notch filer - (electronic circuit added 2/07) |
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Audio Peak Reading Meters - (circuit added 7/02) |
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Audio Signal Source - (diagram added 2/07) |
