In this circuit of a 1968 publication the unijunction may be 2N2646 and the transistor BC548. The power must be according to the relay and the adjustment potentiometer of 1 M. R2 is 100k and R3 is 470-ohm.
Shutdown After 60 Seconds using an UJT (CB12335E)
- Details
- Written by: Newton C. Braga
