This video detector switch controller circuit uses the video output from a VCR or camera to control a relay.
| PARTS LIST | |
| R1 | 10KΩ |
| R2 | 10KΩ |
| R3 | 1KΩ |
| R4 | 33KΩ |
| C1 | 1µF 16V |
| C2 | 100µF 16V |
| D1 | 1N4148 |
| D2 | 1N4148 |
| D3 | 1N4001 |
| Q1, Q2, Q3 | 2N2222 |
| RL1 | 12V or 9V Relay |
A1 = To video output
A2 = To circuit under control
Video turns on Q1, cutting off Q2, allowing Q3 to be forward biased, activating relay RL1.
You can use the timer in your VCR and this unit to generate long time delays as well.
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