Public Address System Schematic
Thought for 1 min
For a real MH-M18, R is the right-channel audio output.
Where R should be connected
It depends on whether your amplifier is mono or stereo.
In your current mono LM386 design
Your amplifier U1 is a single-channel amplifier, so the simplest choice is:
Table
| MH-M18 pin | Connect to |
|---|---|
| R | Leave unconnected |
Use only:
If you want both left and right audio in the mono speaker
Do not connect
Instead, mix them to mono with resistors, then feed the mixed node through C1 into U1.
Based on the MH-M18 document
R directly to L.Instead, mix them to mono with resistors, then feed the mixed node through C1 into U1.
The file states:
- pin 5 = L left channel output
- pin 6 = R right channel output
- pin 4 = GND is the audio signal ground
- the module can wire L / R / AGND to an amplifier input
For your present PA circuit:
- R should be left unconnected
- L should drive the LM386 input
- If you want stereo-to-mono summing, I can help you update the schematic properly with a resistor mixer first.
Mono mixer values
Check MH-M18 pins
Add stereo-to-mono
Verify input coupling
