This programmable electronic musical door bell circuit is really simple since the integrated circuit really does all the things! It should be stated that we now have created some substantial modifications to the application plan. As shown in the below diagram the power supply is extracted from the 230 V mains: the TF1 secondary (2 […]
Alarm
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 […]
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 […]
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 […]
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 […]
Simple Electronic Gong Circuit
This electronic gong circuit simulates the sound of a bell or a gong; The circuit consists of a resonant filter, built around IC2 and IC3, which rings at its resonant frequency when a short pulse is fed to the input. In this circuit the trigger pulse is provided by a 555 timer connected as a […]