This simple 220V light dimmer circuit can be used to adjust the brightness of mains lights. It also can be used to adjust the speed of AC motors. It uses a triac, diac and has a radio-frequency interference (RFI) noise suppression circuit built into it as well.
Schematic diagram:
Component part:
R1 = 10K
R2 = 2K2
R3 = 180K
Potentiometer 250K
C1 = 150nF/400V dipped polyester
C2 = 47nF/630V dipped polyester
C3 = 220nF/250V AC dipped polyester
Triac = 2N6075 or BT136-500D
Diac = HT-32
FUSE 2A or 3A
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 220V LED flasher circuit which is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. This a cheap circuit and easy to build.
Schematic diagram:
Component Parts:
R1_________ 100K R2,R5______ 1K R3,R6______ 470R R4_________ 12K C1_________ 1000µF 25V D1-D4______ 1N4007 D5_________ SCR P0102D Q1_________ BC327 Q2_________ BC337 SK1________ Female Mains socket
