Op-Amp Mic Preamp

Published:2012/11/19 23:47:00 Author:muriel | Keyword: Op-Amp, Mic, Preamp

A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high performance type, e.g. NE5534,TL071, OPA 371 etc   (View)

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Vinyl Pre-Amplifier

Published:2012/11/19 23:44:00 Author:muriel | Keyword: Vinyl , Pre-Amplifier

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The GEM Class-A//AB Amplifier

Published:2012/11/19 23:43:00 Author:muriel | Keyword: GEM, Class-A//AB , Amplifier

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker.   (View)

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Headphone Amplifier

Published:2012/11/19 23:42:00 Author:muriel | Keyword: Headphone, Amplifier

An amplifier to drive low to medium impedance headphones built using discrete components.   (View)

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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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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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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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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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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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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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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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2 Watt Amplifier

Published:2012/11/19 21:33:00 Author:muriel | Keyword: 2 Watt , Amplifier

A 2 Watt audio amplifier made from discrete components.   (View)

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Novel Buzzer

Published:2012/11/19 1:13:00 Author:muriel | Keyword: Novel Buzzer

Circuit NotesThis novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very quickly...so fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary. The speakers tone is thus proportional to relay operating frequency. The capacitor C can be used to tune the note. The nominal value is 0.001uF, increasing capacitance lowers the buzzers tone.   (View)

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High-speed current feedback operational amplifier circuit OPA603

Published:2012/11/18 21:10:00 Author:Ecco | Keyword: High-speed , current feedback , operational amplifier

Internal schematic: Zeroing method is shown in Figure:   (View)

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The input changing circuit using operational amplifier

Published:2012/11/18 21:07:00 Author:Ecco | Keyword: input changing , operational amplifier

Figure a shows a voltage follower, the input signal source resistance RE > 20MΩ, voltage amplification coefficient Vu = 1. In figure b, it uses the first connected field effect source follower circuit to further increase the RE. The RE value is related to FET parameters, and it can be high to 1GΩ. The bypass connected FET can be used to increase the put.   (View)

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Wide Band RF Amplifier for 10MHz - 500MHz Input

Published:2012/11/15 21:14:00 Author:muriel | Keyword: Wide Band, RF Amplifier, 10MHz - 500MHz Input

This is a wide band amplifier cicuit which is suitable for the frequencies between 10MHz and 500MHz. Wide band amplifiers are used in communication receivers, RF measuring equipment and tons of other devices. The circuit described here uses a state of the art transistor to get maximum performance at high frequencies. It can be used as a low noise pre-amplifier due to his low noise characteristics.   (View)

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UHF-TV Preamplifier2

Published:2012/11/15 20:54:00 Author:muriel | Keyword: UHF-TV , Preamplifier

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UHF-TV Preamplifier

Published:2012/11/15 20:53:00 Author:muriel | Keyword: UHF-TV, Preamplifier

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