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 can be used in alarms to generate a warning signal. The circuit is from a 1960s...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
This power supply uses integrated voltage regulators for 1 A of the 78xx series. The output...