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| | | new documentation == https://w2.electrodragon.com/gollum/search?q=MSP1014-dat.md |
| == Schematic == | |
| <gallery>
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| File:LM386_board_schematic.png | Schematic 1
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| File:Lm386_mic_amp1.png | Schematic 2
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| </gallery>
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| {| class="wikitable sortable"
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| |-
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| ! Gain !! C1 !! R1 !! R4
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| |-
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| | 20x, 14x, 10x || - || - || 2k, 5k, 10k
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| |-
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| | 20x || - || -
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| |-
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| | 50x || 10UF || 1.2K
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| |-
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| | 200x || 10UF || -
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| |}
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| * Amplification is controlled by R2 in schematic 2
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| # C1 1~10uF Bypass capacitor
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| # C2 10uF Gain 200x. Optional, without 10uf is 20x gain.
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| # C3 220uF Output coupling capacitor
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| # C4 47nF Boucherot cell
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| # C5 100nF Power supply decoupling
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| # C6 100uF Power supply decoupling
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| # C7 10uF Microphone coupling capacitor
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| # MIC Electret microphone
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| # R1 10R Boucherot cell
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| # R2 1 ~ 10K Microphone load resistor
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| # VSS 4 ~ 12V Supply voltage
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| == Demo Code ==
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| * Only generate very simple sound for testing.
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| <syntaxhighlight lang="Arduino">
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| | |
| #define SOUNDOUT_PIN 9
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| | |
| void setup(void){
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| //Set the sound out pin to output mode
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| pinMode(SOUNDOUT_PIN,OUTPUT);
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| }
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| | |
| void loop(void){
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| //Generate sound by toggling the I/O pin High and Low
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| //Generate a 1KHz tone. set the pin high for 500uS then
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| //low for 500uS to make the period 1ms or 1KHz.
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| | |
| //Set the pin high and delay for 1/2 a cycle of 1KHz, 500uS.
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| digitalWrite(SOUNDOUT_PIN,HIGH);
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| delayMicroseconds(500);
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| | |
| //Set the pin low and delay for 1/2 a cycle of 1KHz, 500uS.
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| digitalWrite(SOUNDOUT_PIN,LOW);
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| delayMicroseconds(500);
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| }
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| </syntaxhighlight>
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| | |
| * Arduino audio player project on this [http://arduino.cc/en/Tutorial/SimpleAudioPlayer page.]
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| [[category: Audio Amp]]
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