This category lists Alarm Circuits service manuals schematic diagrams and links to owner manuals and repair sites. If the Alarm Circuits information you are looking for is not listed here please use the forums and we will try and add it for you.
Oscillating output improves system security Many electronic-control systems have digital outputs that use transistors. One method of improving the security in these outputs is to use an oscillating signal to represent a logic-high state instead of a fixed voltage level (Figure 1). This type of signal, a dynamic variable, can drive the circuit shown in Figure 2.
Power-line outage flashes red alert This Design Idea expands on a circuit in a previous one to configure a power-outage detector with a flashing alarm (Figure 1, Reference 1). The circuit plugs into a mains outlet and uses trickle-charged nickel-cadmium batteries. The green-LED monitors the presence of line voltage. The BZV55-C4V3 zener diode, D1 protects the batteries against overvoltage.
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