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STD Sound activated switch circuit PCB
Mode: Editors' pick
- 1
Update time：
2021-04-10 21:04:45
Creation time：
2015-08-05 03:52:17
Description
lap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp.
555 timer IC acts as mono-stable multi-vibrator then flip-flop changes the state of output relay on every two-clap sound. This can be used to turn ON/OFF lights and fans. Circuit activates upon two-clap sound and stays activated until another sound triggers the circuit.
Specifications:
– Supply 12V DC @ 60mA
– On board preset to set the sensitivity
– On board LED to indicate the Relay on/off state
– On board Microphone
– Relay switch 5Amps, 110V-230V
http://www.electronics-lab.com/project/sound-activated-switch/
Design Drawing
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | NE555 | U1 | SO08 | 1 |
| 2 | CD4013B | U3 | SOP-14 | 1 |
| 3 | 10UF/35V | C1,C2,C4 | C_ELEC_4X4.5 | 3 |
| 4 | 1UF/50V | C3 | C_ELEC_4X4.5 | 1 |
| 5 | 4.7K | R1,R11 | R0805 | 2 |
| 6 | 10K | R2,R6 | R0805 | 2 |
| 7 | 1K | R3 | R0805 | 1 |
| 8 | 100K | R4,R5,R8 | R0805 | 3 |
| 9 | 180K | R7 | R0805 | 1 |
| 10 | 22K | R9 | R0805 | 1 |
| 11 | 0.1UF | C5,C6,C11,C13 | C0805 | 4 |
| 12 | 100k | R10 | TRIM_POT_PTH | 1 |
| 13 | BC847 | T1 | SOT323 | 1 |
| 14 | LED | D1 | LED_0805 | 1 |
| 15 | 1N4007 | D2 | DIODE_SMC | 1 |
| 16 | electret_mic | MINI | MIC-9.7MM | 1 |
| 17 | SIP2 | P1 | HDR1X2 | 1 |
| 18 | 12V RELAY | U4 | RELAY-SRD-12VDC | 1 |
| 19 | SIP3 | P2 | SCREWTERMINAL-3.5MM-3 | 1 |
| 20 | 1k | R12 | R0805 | 1 |
| 21 | SO8 | U2 | SOP-8 | 1 |
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