Line level to Mic level converter PUBLIC

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 the ratio between them.

Example:
1 volt in and trimpot on 0 -> 100k/1k -> 0.01V ("max" mic level).

Ref.
* Mic level: ~  -60 dBV (0.001 volt) to -40 dBV (0.010 volt)
* Line level: 0 dBV (1.000 volt). Swing is 1.414 to -1.414V for consumer levels
* AUX/phono level: Around -10 dBV (0.300 volt)

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 the ratio between them.

Example: 1 volt in and trimpot on 0 -> 100k/1k -> 0.01V ("max" mic level).

Ref. Mic level: ~ -60 dBV (0.001 volt) to -40 dBV (0.010 volt) Line level: 0 dBV (1.000 volt). Swing is 1.414 to -1.414V for consumer levels * AUX/phono level: Around -10 dBV (0.300 volt)