There are 43 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Saturday, January 28, 2023.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
Bat detector microphone pre-amplifiersPreamp Status8 vote up vote down
Voltage follower with 1G ohm input resistance based on LM11 opampPreampOct 21, 2024Status0 vote up vote down
Low impedance microphone amplifierPreampMar 23, 2024Status-6 vote up vote down
General purchase audio preamplifier based on pair of 2N2222 transistorsPreampJan 31, 2025Status-8 vote up vote down
Magentic phono cartridge phono preamp circuit diagramPreampFeb 05, 2025Status-3 vote up vote down
Selection of audio preamplifiers including circuits suitable for battery operationPreampJan 31, 2025Status-4 vote up vote down
IC tone control preamplifier using single 741 opampPreampJul 03, 2024Status-5 vote up vote down
Two transistor audio preamplifier with volume controlPreampJul 03, 2024Status0 vote up vote down
Basic logarithmic amplifier using op-amp and NPN transistorPreampJul 03, 2024Status-5 vote up vote down
Low voltage microphone preamplifier using LM10PreampMay 25, 2024Status0 vote up vote down
Mono audio preamplifier using single 2SC732 transistorPreampMay 25, 2024Status-6 vote up vote down
Low Noise Microphone PreamplifierPreampJun 04, 2024Status-3 vote up vote down
Collection of phono preamplifier circuitsPreampApr 21, 2024Status6 vote up vote down
Simple Car Preamplifier and Artificial EarthPreampJan 29, 2025Status-2 vote up vote down
High quality audio preamplifier (OPA2134)PreampSep 13, 2024Status-8 vote up vote down
Automatic Charger for Battery Operated Hi-Fi PreampsPreampJun 17, 2024Status0 vote up vote down
Basic low frequency preamplifier circuitsPreamp Status2 vote up vote down
Microphone pre-amp with high emphasisPreamp Status-4 vote up vote down
Microphone preamp for portable transceiversPreamp Status-1 vote up vote down
Intercom preampPreampAug 12, 2024Status0 vote up vote down
JFET Bass PreampPreamp Status-1 vote up vote down
Simple microphone preamplifierPreampJan 26, 2025Status1 vote up vote down
Hi-Fi Preamp with remote-control and other advanced featuresPreamp Status-2 vote up vote down
Balanced microphone preampPreampNov 01, 2024Status2 vote up vote down
RIAA Equalized Stereo Phono PreampPreampJun 08, 2024Status-2 vote up vote down
Electret mic amplifierPreampJan 26, 2025Status2 vote up vote down
Audio preamplifierPreampJan 26, 2025Status-12 vote up vote down
LM358 preamp circuit diagramPreampJan 26, 2025Status-1 vote up vote down
Audio preampPreampJan 26, 2025Status0 vote up vote down
FET Preamp CablePreampNov 01, 2024Status-3 vote up vote down
Altec 1564A Preamp Power SupplyPreampSep 13, 2024Status3 vote up vote down
Neumann U67 microphone preamp power supplyPreampSep 13, 2024Status-2 vote up vote down
Altec 428B Microphone Preamplifier schematicPreampSep 13, 2024Status0 vote up vote down
API 321 mic preamp schematicPreampSep 13, 2024Status2 vote up vote down
RCA BA-1A two-stage preamp schematicPreampSep 13, 2024Status0 vote up vote down
RCA BA-21A preamplifier schematicPreampSep 13, 2024Status0 vote up vote down
RCA BA-31A preamplifier schematicPreampSep 13, 2024Status3 vote up vote down
Hi Fi preampPreampJan 26, 2025Status-2 vote up vote down
Carbon Mike Preamp BPF - W6GXNPreampSep 07, 2024Status-2 vote up vote down
Microphone Preamp MC-80PreampSep 07, 2024Status3 vote up vote down
Dynamic Mike Preamplifier for IC-706 - W5RKPreampSep 28, 2024Status-2 vote up vote down
Mike Preamplifier with Dynamic CompressorPreampSep 28, 2024Status-4 vote up vote down
Microphone Preamplifier with Variable Gain LM358PreampSep 28, 2024Status-8 vote up vote down