There are 41 circuit schematics available in this category. Click here for all circuit diagrams. Last circuit added on Thursday, 30 July 2015.

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CircuitCategoryDate AddedOK?Votes 
Bat detector microphone pre-amplifiersPreamp 0
Voltage follower with 1G ohm input resistance based on LM11 opampPreampOct 21, 20090
Low impedance microphone amplifierPreampMar 23, 20031
General purchase audio preamplifier based on pair of 2N2222 transistorsPreampJan 31, 20100
Magentic phono cartridge phono preamp circuit diagramPreampFeb 05, 20100
Selection of audio preamplifiers including circuits suitable for battery operationPreampJan 31, 2010-1
IC tone control preamplifier using single 741 opampPreampJul 03, 2011-1
Two transistor audio preamplifier with volume controlPreampJul 03, 20110
Basic logarithmic amplifier using op-amp and NPN transistorPreampJul 03, 20110
Low voltage microphone preamplifier using LM10PreampMay 25, 20120
Mono audio preamplifier using single 2SC732 transistorPreampMay 25, 20120
Low Noise Microphone PreamplifierPreampJun 04, 20100
Collection of phono preamplifier circuitsPreampApr 21, 20100
Simple Car Preamplifier and Artificial EarthPreampJan 29, 20100
High quality audio preamplifier (OPA2134)PreampSep 13, 20060
Automatic Charger for Battery Operated Hi-Fi PreampsPreampJun 17, 20030
Basic low frequency preamplifier circuitsPreamp 0
Microphone pre-amp with high emphasisPreamp 0
Microphone preamp for portable transceiversPreamp 0
Intercom preampPreampAug 12, 20010
JFET Bass PreampPreamp 0
Simple microphone preamplifierPreampJan 26, 20010
Simple microphone preamplifierPreampJan 26, 20010
Hi-Fi Preamp with remote-control and other advanced featuresPreamp 0
Balanced microphone preampPreampNov 01, 20020
RIAA Equalized Stereo Phono PreampPreampJun 08, 20020
Electret mic amplifierPreampJan 26, 2001-1
Audio preamplifierPreampJan 26, 2001-2
LM358 preamp circuit diagramPreampJan 26, 2001-1
Audio preampPreampJan 26, 20010
Vacuum Tube Microphone PreampPreampNov 01, 20020
FET Preamp CablePreampNov 01, 20020
Altec 1564A Preamp Power SupplyPreampSep 13, 20060
Neumann U67 microphone preamp power supplyPreampSep 13, 20060
Altec 428B Microphone Preamplifier schematicPreampSep 13, 20060
API 321 mic preamp schematicPreampSep 13, 20060
RCA BA-1A two-stage preamp schematicPreampSep 13, 2006-1
RCA BA-21A preamplifier schematicPreampSep 13, 20060
RCA BA-31A preamplifier schematicPreampSep 13, 20060
ECM Mic preampPreampJan 26, 20010
Hi Fi preampPreampJan 26, 2001-1