This alarm circuit with NC sensors in series was taken from an article in Radio Electronics magazine from May 1971. The SCR can be any of the 106 series.
This circuit uses an oscillator that generates a signal of approximately 1450 kHz to test...
Found in a 90s Maxim's documentation, this circuit applies to almost any comparator. | Clique na...
27 MHz Transmitter (CB14008E) This circuit was found in a Japanese publication from the 1970s. The...