Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today. D3 is an LED. The circuit monitors 12 V batteries.
This transceiver is also low power, but this time, it can generate signals in the 144 MHz band. In the...
This circuit is from a 1992 PE Hobbyst Handbook. The circuit fires an old electronic flash using an...
Only when a board with the programmed coding is inserted in the slot does the circuit arm a lock...