Line level to Mic level converter - CircuitLab

Convert line level signal to mic input signal level. Level out = V1 * (R2 +R3)/(R1 + R2 + R3). The actual R values are not so important. Important is

Public circuits tagged audio - CircuitLab

Public circuits tagged microphone - CircuitLab

Public circuits tagged audio - CircuitLab

Linear Circuit Lab (2) - Electronic Circuits Lab

Simple Microphone to Speaker Amplifier Circuit Diagram

Public circuits tagged amplifier - CircuitLab

June, 2012, Gas station without pumps

Online circuit simulator & schematic editor - CircuitLab

How to Switch a Transistor

resistors - Line level to microphone level to record - Electrical Engineering Stack Exchange

Graham's Quick Build #Line2: to Mic Level Attenuator

Mic, line & instrument level signals: their differences and how to

20-dB Premium Stereo Amp/Preamp W/Volume Controller For TV CD Player Recorder

ST-DA3 Line Level Distribution Amplifier - RDL®