The movement of the LEDs in this circuit mimics the back-and-forth movement of a pendulum, making it suitable for clock projects. The circuit is from a Radio Electronics magazine from May 1978.
In fact, we can say that this circuit found in documentation from the 90s, consists of an intercom...
The basic integrated circuits of this 1988 multimeter are no longer very common today, but if...
This circuit is from an old publication of the 70's. It can be implemented with modern transistors like the...