This is the Dual Electret Microphone Pre-Amp — a compact stereo front-end for your DIY microphone projects. It’s not a finished preamp box; it’s the raw circuit board that powers your imagination. Designed for two electret capsules, it buffers, amplifies, and delivers a clean stereo signal ready for recorders, mixers, or effects.

Think of it as a minimalist studio front-end — two matched mic channels with independent gain control and balanced output options. You can use it to build a binaural head, a stereo field recorder, or simply as a clean dual preamp for experiments with sound.

Where commercial preamps hide their circuits in aluminum boxes, this one lays everything bare — encouraging learning, tweaking, and sonic discovery.

What makes it special

• Dual-channel design — power and amplify two electret capsules for true stereo capture.

• Compatible with probably any Electret Capsule you can find.

• Buffered & amplified outputs — clean, low-noise signal ready for line-level devices.

• Gain-tunable — customize the input sensitivity by swapping resistors or op-amps.

• Op-amp flexibility — Compatible with TL072, NE5532, OPA2134 and LM358.

• Simple power — runs on 5-12 V DC.

• Maker-friendly layout — large pads, through-hole components, clear silkscreen, and optional headers for external connectors.

What you get

• 1 × Dual Electret Microphone Pre-Amp PCB (silkscreen + drilled).

• PDF including schematic, suggested BOM, and quick-start wiring guide.

Who it’s for

• DIY audio builders and circuit tinkerers.

• Field recordists crafting compact stereo rigs.

• Students learning about impedance buffering and mic biasing.

• Musicians exploring spatial or experimental recording setups.