Public Address System Schematic

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Audio Input
C1
C1 P2 - U1 +INPUT
J2 3 - C1 P1

Searching for datasheet info.

Running multiple web searches.

Found 9 results.

Found 10 results.

Looking for "Pin function table for MH-M18 including KEY MUTE VCC GND L R" in M18-M28-M38-R0.pdf?srsltid=AfmBOorm20CZ-2wf0jTgjqYiZCWWTzzE6RKK1YngsiorA68H22ZBvW8y

Looking for "Wiring diagram or application diagram showing KEY MUTE VCC GND L R connections" in M18-M28-M38-R0.pdf?srsltid=AfmBOorm20CZ-2wf0jTgjqYiZCWWTzzE6RKK1YngsiorA68H22ZBvW8y

Looking for "Pin function table for MH-M18 including KEY MUTE VCC GND L R" in MH-M18.pdf

Looking for "Wiring diagram or application diagram showing KEY MUTE VCC GND L R connections" in MH-M18.pdf

Yes. For your current PA schematic, the real MH-M18 should be connected like this.

MH-M18 pin connections for your PA circuit

MH-M18 pinDatasheet functionConnect to in your schematic
1KEY - button control terminalLeave unconnected for now, unless you want play/pause/track control buttons
2MUTE - outputs 3.3 V high when muted, 0 V during playbackLeave unconnected in this simple design
3VCC - 5 V supplyConnect to +5V, same rail as U2 output and C5 positive side
4GND - power negative / audio signal groundConnect to GND, same ground as U1 pin 4, U1 pin 2, J1 negative, and SPK1 return
5L - left audio outputConnect through input coupling capacitor C1 to U1 pin 3 (+INPUT)
6R - right audio outputLeave unconnected for a simple mono design, or mix to mono later with resistors

For your exact LM386 hookup

SignalConnects to
MH-M18 pin 3 VCC+5V
MH-M18 pin 4 GNDGND
MH-M18 pin 5 LC1 input side
C1 output sideU1 pin 3 (+INPUT)
U1 pin 2GND
U1 pin 4GND
U1 pin 6+9V
U1 pin 5C2 -> SPK1
Important correction to your current placeholder mapping
Your current J2 should not be interpreted as:
  • pin 1 = +5V
  • pin 2 = GND
  • pin 3 = audio
  • pin 4 = audio ground
  • pin 5 = optional audio
For a real MH-M18, it should be:
  • pin 1 = KEY
  • pin 2 = MUTE
  • pin 3 = VCC
  • pin 4 = GND
  • pin 5 = L
  • pin 6 = R
Recommended simple mono use
For the cleanest version of this project:
  • use L only from MH-M18
  • leave R, KEY, and MUTE unconnected
  • use GND as both power ground and audio ground
If you want, I can update the project schematic so J2 matches this MH-M18 pin mapping exactly.
@schematic check J2 pins
Mono MH-M18 mapping
Ask about R output
Review input stage
10m

Plan completed.

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C2
Capacitance
220uF
U2
U1 -INPUT - U2 GND
U1 -INPUT - U2 GND
J1 POS - U1 VS
C5
Capacitance
10uF
U1 GAIN_2 - C3 P2
J2 4 - J1 NEG
U1 -INPUT - U2 GND
J1 POS - U1 VS
C1
Capacitance
10uF
U1 VOUT - C2 P1
U1 GAIN_2 - C3 P2
J1 POS - U1 VS
C1 P2 - U1 +INPUT
U2 OUT - C5 P1
C1 P2 - U1 +INPUT
J2 3 - C1 P1
C2 P2 - SPK1 ~
U2 OUT - C5 P1
C3
Capacitance
10uF
J2 4 - J1 NEG
U2 OUT - C5 P1
J2 4 - J1 NEG
U1 GAIN_1 - C3 P1
U1 -INPUT - U2 GND
C4
Capacitance
10uF
U1 VOUT - C2 P1
C2 P2 - SPK1 ~
J2 3 - C1 P1
J1 POS - U1 VS
U1 GAIN_1 - C3 P1
GND
U1 -INPUT - U2 GND
J1
J2
SPK1
U1
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Public addressing system thumbnail
Welcome to your new project. Imagine what you can build here.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$2.57–$2.91

Digi-Key

$2.78–$3.30

LCSC

$2.96–$3.09

Mouser

$6.19

TME

$1.07

Verical

$2.40–$3.17

Assets

Assets are files uploaded to this project which can be used in various ways.

Controls