Capacitive Proximity Sensor Alarm Circuit

The discussed capacitive proximity sensor alarm circuit is composed of a transistor TR1 NPN BC107 (or similar) fitted in oscillator and operating a Darlington TR2 NPN BC517 accustomed to push a 12V relay. The concept is very easy: TR1 can be an HF oscillator whose frequency relies on the JAF1 choke and also the parasitic […]

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Simple 220V Ding Dong Bell Circuit

The post explains how to make a simple 220V mains operated ding dong bell circuit which will generate a powerful ding dong sound each time someone presses the bell push button. This bell produces the classic “Ding-Dong” bell sound but does not use mechanical parts. With an integrated one designed for such use and some […]

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Simple Electronic Gong Circuit

The discussed electronic gong circuit initiates a couple of solenoids in sequence to affect two chimes or gongs one while your doorbell is pushed. another whenever it is released. Any time pushhutton S1 the front doorbell is first pushed C2 immediately charges. This stops switch rebound. that might result in solenoid L2 to activate ahead […]

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Doorbell With Memory Circuit

The post explains how to enahnce your doorbell with a circuit which would facilitate a doorbell with memory circuit and allow the user to know through an illuminated LED if somebody has pressed the doorbell button while he was out and unavailable at home. On situation it could be helpful to understand when a guest has […]

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