Transistor time relay circuit

Five of the transistor time relay circuit b (a) for the exchange of time relay, Figure (b) is a linear flow of time following, the use of only two different power supply,
Transistor time relay circuit - schematic

the circuit is the same. Adjust the potentiometer can change the delay time. Time delay element JsJ transistor relay parameters listed in Table 12-1. Delay error: 1-50s when the soil 3%; 2-5min when 6%.

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