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Last Updated on: Friday, August 29, 2008 02:32 PM

Circuits Designed by Dave Johnson, P.E. :

AUDIO AMP + 3KHz FILTER
This circuit is the audio amp section for a complete optical transmitter. The circuit amplifies and filters the voice audio signals from an electret microphone. The circuit is described in more detail in the receiver section of Dave Johnson's Handbook of Optical Through the Air Communications.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

2 Channel Power Amplifier: 2-Channel Power Amplifier based on NTE1606. circuit is powered by a12V,10-Amp power supply. power of output channels is4 W connected to 8-ohm loudspeakers (added 2/07)

2 Tone Audio Oscillator use for SSB Tests: (electronic schematic / circuit added 2/07)

2 Tone Train Horn: (schematic / circuit added 10/02)

2 Watt Amplifier #1: (circuit added 9/04)

2 Watt Amplifier #2: Low distortion Amplifier using discrete components (added 5/02)

2 Watt Amplifier: (schematic / circuit added 9/06)

2 Tone Audio Oscillator use for SSB Tests: (electronic schematic / circuit added 2/07)

2 Tone Train Horn: (schematic / circuit added 10/02)

2 Watt Amplifier #1: (circuit added 9/04)

2 Watt Amplifier #2: Low distortion Amplifier using discrete components (added 5/02)

2 Watt Amplifier: (schematic / circuit added 9/06)

2 Wire Remote Microphone Amplifier: uses special Amplifier module from Op-Amp Labs (added 4/02)

20 dB Amplifier and High Current Balanced Line Driver: AS023 Jenson Transformer Application Note (app note 6/07)

20 W/Ch Stereo IC Amplifier: Based on the versatile LM1875 from National Semiconductor (added 6/07)

20 Watt Amplifier: (schematic added 9/06)

20 Watt GaAs-FET Power on 2.3 GHz: (circuit / schematic added 6/03)

20 Watt Power Amplifier: Designed to be used as car Amplifier (added 4/02)

20 Watt/Channel Stereo Power Amplifier: Based on the versatile LM1875 from National Semiconductor (circuit / schematic added 6/03)

200 Watt Amplifier: (electronic schematic / circuit added 4/02)

20W Amplifier: (electronic circuit added 4/05)

22 Watt Audio Amplifier: (electronic design added 6/07)

22 Watt Class a Power Amplifier: (circuit / schematic added 6/03)

22 Watt Stereo Amplifier: (electronic design added 6/07)

220 Watt Power Amplifier: This is a building plan for an audio Amplifier with2 x220-Watt output power. Text is in Finnish. (added 4/02)

25 Watt MOSFET Amplifier: High Quality simple unit. No need for a PreAmplifier (added 9/04)

25 Watt MosFet Audio Amplifier: (electronic design added 6/07)

250 Watt Amplifier: (electronic circuit added 9/06)

2-Input Mixer: As simple as it gets. mixer consists of two transistor-based preAmplifiers. first one (designated "Mike in") offers higher gain. it works well with a regular dynamic microphone. second one can be used to control audio input from a tape recorder/CD player. (added 10/05)

2N2222 40 Meter CW/DSB Tranceiver: (electronic Circuit added 7/06)

2-Step Power Conversion: Portable Power for the Future: Design Solutions 8 Design Notes (Linear Technology) (app note added 73/06)

2-Transistor Amplifier: A simple two-stage Amplifier. Use any general-purpose NPN with high gain. It will drive low impedance headphones directly. A speaker will probably require furr boost. (added 10/05)

2W Amplifier: Amplifier operates in Class AB mode; single 470R preset resistor controls quiescent current flowing through BD139/140 complimentary output transistors. Adjustment here, is a trade-off between low distortion and low quiescent current. Typically, under quiescent conditions, standby current may be 15 mA rising to 150 mA with a 50 mV input signal. A simulated frequency response is ... (added 4/05)

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