Integrated signal generator appeared in Radio Electronics magazine in January 1968. The integrated circuits are from the time and the generator produces signals from 5 Hz to 50 kHz.
This circuit works with only 1.5 V and can be powered by a solar panel. The circuit is from 1991....
This digital timer provides timings from 1 minute to 10 hours with indication on a 3-digit...
This sensitive Japanese mid-wave receiver from the 1960s has an output power of 45 mW and is...