Assembled with SMD components, this FM transmitter fits into a pen. We have already published a similar project on this site. This is from an Australian publication from 1991. Printed circuit board is provided.
This circuit turns a lamp on and off with alternate touches of a switch. Modern Darlingtons can be used....
This circuit with the CK722 was found in a Raytheon publication from the 60's. The relay is of the...
This circuit was found in Radio Electronics magazine from July 1960. The components used are...