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.
This circuit is more elaborate than the previous one. It was obtained from an 80s circuit manual. The...
This CMOS circuit divides the frequency of a rectangular signal up to 2 MHz by 6. The supply...
This circuit triggers a warning oscillator if you forget the lights on when you leave the car. The...