This power source was found in a 1968 Electronics World. The transistors are from that time. The current of each output is limited by the transformer.
Found in Harris' 90s documentation, this circuit uses a zener as a stabilizer. The signals...
The integrated circuit used in this small transmitter is not very common today. The coil has its...
The resistors R1 and R2 consist of 8 220 ohms x 2 W resistors connected in parallel. The...