This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced with equivalents, only with care so that the doubles are exchanged for matched pairs.
We found this circuit in a 1981 publication, when it was still possible to find 22.5 V batteries (used...
This circuit was found in an old Popular Electronics. It causes an LED to pulse and, at the same...
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...