This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output switch of this circuit is act by a relay.
Component Parts list:
R1, R7 1K R2, R4, R8 10K R3 2K2 R5 1M R6 200K R9 39K D1, D4 1N4004 D2, D3 1N4148 C2, C5 2.2uF/16V mini ecap | C1 10uF/16V mini ecap C4 100pF C3 100nF Q1 BC548 IC1 LM358 (of Hitachi HA17358) 8 pin IC socket Relay AX-SH-112L LED 3mm Electret microphone |
This is a sound activated switch circuit. It’s will turn on and turn off based on a loud sound such as clapping your hands. You can adjust the sensitivity (how loud of a sound will activate the circuit) from a pin drop to a Mack Truck Horn. Very practical for a variety of projects. Add a relay to turn on a light when your dog barks, or set of a siren when an intruder makes a loud noise.
Here the circuit diagram:
Component Part:
| R1, R5, R16 = 10kΩ R3 = 22kΩ R2, R6, R9, R13 = 220kΩ R4, R10, R12, R14 = 100kΩ R7 = 270kΩ R8 = 4.7MΩ R11 = 1MΩ R15 = 330kΩ R17 = 4.7kΩ P1 100kΩ Trim Pot | C1, C3 = 10nF C2, C4 = 100nF C5, C6, C8, C9 = 1nF C7 = 1μF/16V Electrolytic C10 = 100μF/16V Electrolytic Q1 = 2N3904 Q2 = MPS6531 U2 = 4001 Integrated Circuit U1 4011 Integrated Circuit LED = LED Red MIC = Electret Microphone |
This is a motor speed controller circuit diagram built based Maxim MAX4295. This with this circuit you will be able to control the speed of motor rotation.
Resistor R1 biases the potentiometer to match the input range of U1. Full counter-clockwise rotation of the pot corresponds to maximum-speed reverse rotation of the motor. Mid-scale on the pot corresponds to motor off, and full clockwise rotation of the pot produces maximum-speed forward rotation in the motor.
