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.
This circuit is from a 1991 publication, but it can be assembled with more modern components. We...
We found this circuit in an old neon lamp application manual. The circuit stores a call. The...
This circuit multiplies the frequency of a signal by 100. The circuit was found in the October 1994...