This circuit is used in magnetic tape recorders, having been found in documentation in the 1960s. The circuit uses Japanese transistors, and the critical components are transformers.
A modulated (intermittent) siren, using the four gates of the 4001 integrated circuit is shown in the...
This circuit was found in specialized microwave documentation from the 1960s. The circuit makes use...
The integrated circuit used in this 80's application is very hard to find today. The circuit is of an...