Circuit Diagram

Low Voltage Preamplifier

Published:2012/11/19 23:41:00 Author:muriel | Keyword: Low Voltage , Preamplifier

A low voltage preamplifier optimized for 3 Volt operation.   (View)

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ECM Mic Preamplifier circuit

Published:2012/11/19 21:50:00 Author:muriel | Keyword: ECM Mic, Preamplifier circuit

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components.   (View)

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Doorphone Intercom circuit

Published:2012/11/19 21:49:00 Author:muriel | Keyword: Doorphone Intercom circuit

A simple Intercom made with a single transistor and low power audio amplifier LM386. The circui uses 8 ohm speakers, which also double as a microphone.   (View)

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Dynamic Microphone Preamp

Published:2012/11/19 21:48:00 Author:muriel | Keyword: Dynamic Microphone, Preamp

A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance.   (View)

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Audio Level Meter circuits

Published:2012/11/19 21:48:00 Author:muriel | Keyword: Audio Level , Meter circuits

Audio levels can be monitored using a small panel meter with this circuit built from discrete components.   (View)

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Amp with Tone Controls & Soft Switching

Published:2012/11/19 21:47:00 Author:muriel | Keyword: Amp , Tone Controls, Soft Switching

Built around an LM380, this amplifier includes tone controls and electronic soft switching . The soft switching circuitry ensures power is built up gradually eliminating the dc thump.   (View)

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Audio VU Meter circuit

Published:2012/11/19 21:46:00 Author:muriel | Keyword: Audio, VU Meter circuit

This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.   (View)

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15 Watt Amplifier circuits

Published:2012/11/19 21:45:00 Author:muriel | Keyword: 15 Watt, Amplifier circuits

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Quadraphonic Amplifier circuits

Published:2012/11/19 21:45:00 Author:muriel | Keyword: Quadraphonic , Amplifier circuits

This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.   (View)

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Audio Voice-Over Circuits

Published:2012/11/19 21:43:00 Author:muriel | Keyword: Audio Voice-Over Circuits

This is a circuit where a microphone and preamp circuit (voice circuit) have priority over any other audio signal. You can think of this as a one way intercom, if the main amplifier is used for listening to music, then when the push to talk switch is pressed, the amplifier is switched to the voice signal.   (View)

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3 Band Equalizer circuits

Published:2012/11/19 21:42:00 Author:muriel | Keyword: 3 Band , Equalizer circuits

  (View)

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Computer Microphone

Published:2012/11/19 21:41:00 Author:muriel | Keyword: Computer Microphone

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Doorphone Intercom

Published:2012/11/19 21:39:00 Author:muriel | Keyword: Doorphone Intercom

A simple Intercom made with a single transistor and low power audio amplifier LM386. The circui uses 8 ohm speakers, which also double as a microphone.   (View)

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Audio Peak Level Meter

Published:2012/11/19 21:38:00 Author:muriel | Keyword: Audio, Peak Level , Meter

Using a single MOSFET Op-amp this circuit samples the audio input and displays peak readings.   (View)

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Hi-Fi Preamplifier

Published:2012/11/19 21:36:00 Author:muriel | Keyword: Hi-Fi , Preamplifier

This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response,as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro.   (View)

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6 Input Mixer

Published:2012/11/19 21:36:00 Author:muriel | Keyword: 6 Input , Mixer

A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts.   (View)

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Notch Filter

Published:2012/11/19 21:35:00 Author:muriel | Keyword: Notch Filter

A variable notch filter with both high and low pass filters.   (View)

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TDA2030 8w Amplifier

Published:2012/11/19 21:35:00 Author:muriel | Keyword: TDA2030 , 8w, Amplifier

An 8 watt amplifier made with the TDA2030 IC. Built two such units for a stereo amplifier.   (View)

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Line Driver

Published:2012/11/19 21:34:00 Author:muriel | Keyword: Line Driver

A stereo line driver for feeding long cables or buffering an audio source.   (View)

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ECM Mic Preamplifier

Published:2012/11/19 21:33:00 Author:muriel | Keyword: ECM Mic , Preamplifier

A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components.   (View)

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