This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
This circuit generates approximately sinusoidal signals from the rectangular signals generated by a 4093...
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
This circuit activates a recorder from the signal obtained from a telephone line in the service. It is...