We found this small FM transmitter in an Australian publication from 1991. The 3-transistor circuit has a range on the order of 400 meters.
This circuit should be used with low frequency signals only. The circuit is from a documentation from the...
Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be...
The operational amplifier for this circuit found in a 1979 documentation may be the 741. We can...