Found in an American documentation from the 90's, this 1.5 A power supply provides 1.5 to 22 V of output. The integrated circuit must be mounted on a heat sink.
This simple blocking oscillator using a transistor can be used in alarms or call systems. The...
The circuit in figure 10 uses two of the 4001's four ports to trigger a relay in a timed manner. The...
Other series comparators such as the LM239 and LM339 can be used in this oscillator circuit. The...