Transistor time relay circuit 5b

Transistor time relay circuit 5b

 (a)
is an AC time relay, and Figure (b) is
a DC time relay. They only use different power supplies, but
their circuits are the same.
    Adjust the potentiometer to change the delay time. The delay component parameters of
    JsJ type transistor time relay
are listed in Table 12-1. Delay error:
±3% when 1-50s; ±6% when 2-5min.