In this video, I’ll show you how to make a Bass Microphone Preamp Circuit using a BC549 transistor, specially tuned to capture deep, bass-rich audio. This circuit is designed to amplify low-frequency signals — perfect for vocals, instruments, or ASMR-style recordings using a dynamic or electret mic.The circuit uses large-value coupling capacitors to allow more bass frequencies to pass through without distortion or filtering. You can connect the output directly to a smartphone (TRRS jack) or a speaker amplifier for powerful, clear sound.
Key Features:
Low-noise amplification using BC549 transistor
Strong response to low (bass) frequencies
Works with electret or dynamic (coil) microphones
Portable — runs on a 3V to 9V power supply
Ideal for mobile recording, YouTube videos, and DIY audio setups
Circuit Design:
Common-emitter amplifier topology
Large capacitors (10µF – 100µF) for better bass
Proper DC biasing for stable audio gain
Audio output through coupling capacitor to TRRS/mobile
Components Used:
1 × BC549 NPN transistor
1 × Microphone (Electret or Dynamic)
Resistors: 10kΩ, 100kΩ, 47kΩ, 1kΩ
Capacitors: 10µF, 100µF
Power supply: 3V–9V battery or DC adapter
Optional: TRRS jack for mobile phone connection
Perfect For:
Deep voice or bass instrument recordings
YouTube or podcast audio
Low-frequency sound detection
DIY audio and electronics enthusiasts
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#BassMicrophone #MicPreamp #BC549 #DIYAudio #VoiceAmplifier #ElectronicsProject #MicrophoneAmplifier #ASMRMic
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