Preamplifiers circuit diagrams
A microphone amplifier that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components.
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Stand-alone, 9V battery powered unit. Three-level input selector, three-band tone control
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This circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms.
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This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm.
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This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone.
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An electric guitar pre-amp with tone controls using dual supplies. The guitar pickup is high impedance, therefore good quality screened cable must be used between guitar pickup and the preamp.
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This circuit has an exceptionally fast high frequency response,as demonstrated by applying an 100kHz squarewave to the input.
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A low voltage preamplifier optimized for 3 Volt operation.
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A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance.
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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.
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