This circuit was found in a documentation of the 80s, having didactic purpose. For R1 values between 10k to 1M can be used. Transistors are general purpose types.
The TTL 74123 integrated circuit consists of a monostable that can be configured to generate...
This constant current source from a 1980 publication can be used on a battery charger. Transistor Q1 may...
This circuit uses one of two D-type flip-flops available on an integrated circuit 4013. The...