This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
This VCO with a common operational amplifier was found in an old American documentation. The...
We find this circuit in a manual of the 80's own used components. The circuit provides an...
This circuit keeps the courtesy lights of a car on for a while after the doors are closed. The...