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This is a compact electronic siren circuit based on three transistors.This circuit is suitable for in corporating with other alarm or siren projects such as burglar alarms, automatic factory sirens etc or a simple push to on alarm.
The circuit is working, but how do i add a crystal to stabilise the frequency when battery voltage drops.
The circuit presented here show using a four 7-segment LED displays if mailbox is empty or full.
CAPTCHAThis question is for testing whether you are a human visitor and to prevent automated spam submissions. How to Build an Electronic Circuit Breaker?How to Build an Electronic Short Stop Circuit Breaker?

In this article we are going to discuss the simple construction of a very useful circuit breaker device, which can be used to eliminate the possible hazards of an electrical short circuit.
When the switch P1 is released, the outputĀ  frequency decreases slowly as C2 is charged to theĀ  positive voltage through resistance R6 and the Base-Emitter junction of tramsistor Q2.
In idle state, the transistor T2 conducts, the show is word Leer for assembly work, you must mount light barrier where mail enter in the box.
But before that, it is interesting to know the possible sources of a short circuit, and the drawbacks of the conventional protection devices. If the power supply is very far away from the circuit , the supply wires may catch stray noises from the surroundings and this cannot be corrected by the filter and decoupling capacitors inside the power supply circuit.The capacitor connected across the supply lines will by pass these induces noises, making the circuit perform better.

Domestic mains electric power, available in every house, carries high voltages and currents and thus is potentially very dangerous.
Any way this is just an extra precaution and there wont be much problem in the practical performance of the circuit even if you don’t use this capacitor. This word remains on display until it is acted S1 button which returns circuit to its initial state.

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