LM386 - Revision history

Chao at 06:11, 3 April 2025

2025-04-03T06:11:13Z

← Older revision		Revision as of 14:11, 3 April 2025
Line 1:		Line 1:
			new documentation == https://w2.electrodragon.com/gollum/search?q=MSP1014-dat.md
	== ~~Schematic ==~~
	~~<gallery>~~
	~~File~~:~~LM386_board_schematic~~.~~png \| Schematic 1~~
	~~File:Lm386_mic_amp1~~.~~png \| Schematic 2~~
	</~~gallery>~~

	~~[[category: Audio Amp]]~~

Chao at 06:06, 3 April 2025

2025-04-03T06:06:52Z

@@ Line 5: / Line 5: @@
 File:Lm386_mic_amp1.png | Schematic 2
 </gallery>
 [[category: Audio Amp]]

Chao: /* Demo Code */

2025-04-03T05:57:32Z

Demo Code

@@ Line 29: / Line 29: @@
 # R2	1 ~ 10K	Microphone load resistor
 # VSS	4 ~ 12V	Supply voltage
 [[category: Audio Amp]]

Chao at 13:08, 16 January 2020

2020-01-16T13:08:05Z

New page

== Schematic ==
<gallery>
File:LM386_board_schematic.png | Schematic 1
File:Lm386_mic_amp1.png | Schematic 2
</gallery>
{| class="wikitable sortable"
|-
! Gain !! C1 !! R1 !! R4
|-
| 20x, 14x, 10x || - || - || 2k, 5k, 10k
|-
| 20x || - || -
|-
| 50x || 10UF || 1.2K
|-
| 200x || 10UF || -
|}
* Amplification is controlled by R2 in schematic 2
# C1 1~10uF Bypass capacitor
# C2 10uF Gain 200x. Optional, without 10uf is 20x gain.
# C3 220uF Output coupling capacitor
# C4 47nF Boucherot cell
# C5 100nF Power supply decoupling
# C6 100uF Power supply decoupling
# C7 10uF Microphone coupling capacitor
# MIC Electret microphone
# R1 10R Boucherot cell
# R2 1 ~ 10K Microphone load resistor
# VSS 4 ~ 12V Supply voltage
== Demo Code ==
* Only generate very simple sound for testing.
<syntaxhighlight lang="Arduino">

#define SOUNDOUT_PIN 9

void setup(void){
//Set the sound out pin to output mode
pinMode(SOUNDOUT_PIN,OUTPUT);
}

void loop(void){
//Generate sound by toggling the I/O pin High and Low
//Generate a 1KHz tone. set the pin high for 500uS then
//low for 500uS to make the period 1ms or 1KHz.

//Set the pin high and delay for 1/2 a cycle of 1KHz, 500uS.
digitalWrite(SOUNDOUT_PIN,HIGH);
delayMicroseconds(500);

//Set the pin low and delay for 1/2 a cycle of 1KHz, 500uS.
digitalWrite(SOUNDOUT_PIN,LOW);
delayMicroseconds(500);
}
</syntaxhighlight>

* Arduino audio player project on this [http://arduino.cc/en/Tutorial/SimpleAudioPlayer page.]
[[category: Audio Amp]]