The sensor is S1 in this alarm that we found in a Radio Electronics magazine from May 1971. Several sensors can be used in series. The SCR supports equivalents from the 106 series.
The components of this circuit from the 70's are no longer common on the market, but it is...
This circuit produces rectangular and triangular signals using two 741 operational. The source must...
The basis of this 90s circuit is a CA3130 operational amplifier. The circuit does not need a...