Using circuits from Analog Devices, this circuit does not need a symmetrical power supply. It is also offset adjustable and is based on the LT1498 and LT1167 op amps.
This control panel allows the use of NO and NC sensors, turning the alarm on after 30 seconds...
This circuit, found in a 1989 publication, only works with incandescent lamps. The maximum power...
We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR...