- 5V power supply
- 2 Relay SPDT
- make input 0V to activate relais
- sink current per input pin: 1.8mA
- power supply with one relais on: 73mA
- power supply with two relais on: 140mA
- power supply with no relais on: 0mA
- FL817C - 4 Pin Dip - Optocoupler
- LED indicates relais on
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