This static switch or triac contactor was obtained from Philips 1969 documentation. The SCR is from the era, but modern equivalents depending on the load can be used.
This circuit was obtained in an old Argentine publication, using germanium transistors and...
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
Found in old documentation, this simple test checks both the polarity and the existence of voltage...