Timer circuit with 106 fixed preset time

The foot 13 between valve value 1 and valve value 2 will suck the transistor base current. If relay releases, after recovery time 0.5s, to press key then it will start to switch process again. The timer is composed ofwindow discriminator TCA965 to. After pressing the key Ta, decision time capacitance C will charge. transistor T1 obtains base curren..

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