Found in RCA documentation two years 70, this circuit triggers an incandescent lamp at dusk. The circuit uses an LDR of the time.
A configuration that can be used to do frequency division, and that uses only a current amplifier, is...
This circuit is from an old American publication. It divides a 40 to 60 MHz TTL signal by integer...
This circuit was originally recommended for an electric oven warning system. However, we can use...