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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 Voice-Over Circuit - (electronic design added 6/07) |
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Balanced Low Noise Microphone Preamp - very low noise, close to
oretical minimum, high hum rejection and variable gain with a single rotary pot,
similar to that used in many professional grade mixing desks (added 8/03) |
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Basic electret microphone powering circuits - This is basic electret
microphone powering circuit which you can use as generic reference when receivign
circuits which use electret microphones. The putput impedance is determined by R1 and
R2. If you leave out R2 output impedance is roughly resistance of R2.
(added 2/06) |
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Bat detector microphone pre-Amplifiers - The microphone pre-amplifier has
the job of amplifying and conditioning the signal coming from the microphone. In case
of an electret microphone, the amplifier must have a gain that increases with
frequency to compensate for the low sensitivity of the microphone for high
frequencies. Also the low frequency part must be filtered out. In case of a piezo
transducer,(circuit added 08/08/08) |
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Bat detector microphone pre-amplifiers - I have found this circuit to have
better sensitivity, both in distance to a visible bat and in audio frequency, than
some other published circuits using a 40kHz transducer with 4000x gain amplification,
though the 40kHz transducer I used for the comparison may have a bearing on these
results. [Circuit design by Chris Eve] |
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Battery powered electret microphone - Note: scroll down to this this
circuit. This circuit can be used with normal tape recorders and sound cards
which usually are designed for dynamic microphones. When you build this circuit inside
microphone case (or to small external box) you can make yourself an universal
microphone out of an electret capsule. (added 2/06) |
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Battery Powered Electret Microphone #2 - Note: scroll down to this this
circuit. This circuit can be used with normal tape recorders and sound cards
which usually are designed for dynamic microphones. When you build this circuit inside
microphone case (or to small external box) you can make yourself an universal
microphone out of an electret capsule. (added 6/06) |
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Big Ear Stereo Parabolic Microphone - This device is a stereo amplifier for
a high sensitivity stereo parabolic microphone. It can be used for listening to
distant sounds. Typical parabolic microphones are monophonic, this unit has a stereo
audio path that helps produce more realistic sounding audio. The Big-E can be used
with headphones or as an audio source for a stereo tape recorder(added 6/06)
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Big-E Stereo Parabolic Microphone - This device is a stereo amplifier for a
high sensitivity stereo parabolic microphone. It can be used for listening to distant
sounds. Typical parabolic microphones are monophonic, this unit has a stereo audio
path that helps produce more realistic sounding audio. The Big-E can be used with
headphones or as an audio source for a stereo tape recorder(added 10/05) [(C) G.
Forrest Cook January 1, 2005] |
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Binaural M ICs - (electronic schematic / circuit added 4/02) |
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Binaural Microphone System - A low-cost, hi-fi binaural mic setup for
unencumbered recording of stereo sound, typically with new Minidisc recorders.
(Circuit design added 9/06) |
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Boundary Layer Dish Microphone - ideas for a directional microph1-assembly
(added 5/02) |
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