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• BASEMENT DOORBELL BEEPER
  If you can't hear your doorbell when you are in your basement try this circuit. This circuit takes advantage of the 24vac power source located near the furnace. Using a simple current transformer technique, the circuit sounds a beeper whenever the main door chime is activated.

• Basement Doorbell
  This circuit will activate a beeper in the basement, whenever the front doorbell is pressed.

• Door Knock Beeper  NEW
  In some apartment buildings and homes, not equipped with a door bell, it may be hard to hear someone knocking on the front door.  The circuit below provides a means to activate a loud beeping sound inside, whenever someone knocks on the door from the outside.  The circuit is powered by a 9v battery, which should provide years of service.  An on/off switch allows the device to be turned off if desired... 

Basement Doorbell - This circuit will activate a beeper in the basement, whenever the front doorbell is pressed. ….(designed by David A. Johnson)

Basement Doorbell Beeper - If you can't hear your doorbell when you are in your basement try this circuit. This circuit takes advantage of the 24vac power source located near the furnace. Using a simple current transformer technique, the circuit sounds a beeper whenever the main door chime is activated. ….(designed by David A. Johnson)

Birdie Doorbell Ringer - (schematic / circuit added 10/02)

Counter with Doorbell - (electronic design added 6/07)

Ding-Dong Bell - (electronic Circuit / Schematic added 10/04)

Door Knock Beeper - In some apartment buildings and homes, not equipped with a door bell, it may be hard to hear someone knocking on the front door.  The circuit below provides a means to activate a loud beeping sound inside, whenever someone knocks on the door from the outside.  The circuit is powered by a 9v battery, which should provide years of service.  An on/off switch allows the device to be turned off if desired.... ….(designed by David A. Johnson)

Doorbell Chime - (electronic circuit added 6/07)

Doorbell for the Deaf (Andy Collinson) - This circuit provides a delayed visual indication when a door bell switch is pressed. In addition, a DPDT switch can be moved from within the house which will light a lamp in the door bell switch. The lamp can illuminate the words "Please Wait" for anyone with walking difficulties...... (schematic / circuit design added 9/02)

Doorbell Indicator-Remote - (electronic design added 6/07)

Doorbell with Counter - (circuit added 7/02)

Electronic Canary Doorbell - This circuit is a modified "Hartley Oscillator" with a couple extra parts.  T1, the LT700 (or equivalent, is a small center tapped (ct) audio transformer with an impedance of 1000 ohms at 1000 hertz.  The secondary of this transformer has an impedance of 8 ohms.  Usually noted as 1K:8 ct.  I tried a couple other models like the red and green types (taken out of a $5 made-in-china am pocket radio) and they both work good.  You may have to adjust the caps to get the sound... (added 2/06)

Fix Adds Door-Chime Repeater - 05/13/99 EDN-Design Ideas / (added 11/05)

Multi-Switch Doorbell with Indicators - (electronic Circuit / Schematic added 10/04)

Remote Doorbell Indicator - (schematic / circuit design added 9/02)

Remote Doorbell Warning Switch - This circuit should only be used with the solenoid type chime doorbells, the electronic type that play tunes will not work here. The hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if you are watching TV , this circuit gets round the problem by providing a visual indication, i.e. a lamp....(added 2/06)

Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells.  Two-LED display, no power supply required.   (electronic circuit added 06/07/08)

Simple Fix Adds Door-Chime Repeater - 05/13/99 EDN-Design Ideas / (added 11/05)

Two Tone Generator - This two-tone generator includes 3 ICs NE555 Astable Multivibrators. You can vary the duration of each tone by changing the 10k resistor or 100MF capacitor at IC1 or changing resistors and capacitors at IC1/2 for higher or lower tone. Designed by Andrew R. Morris  (added 6/03)

Universal Ding-Dong - One frequently finds gongs or chimes for sale in antique shops or Eastern markets. But supposing one would want to wire these to a pushbutton at the front door to create a ding-dong doorbell? How would this be done? Or consider, for a moment, more creative possibilities. How would one e.g. cause wine-glasses or African drums to resonate when a doorbell is pressed? The circuit shown in Fig. 1 provides a mechanical means of striking two gongs or chimes in sequence -- one when the doorbell is pressed, the other when it is released. This it does by briefly activating two solenoids in...

Wireless Doorbell - The transmitter circuit is made up of two building blocks - the 303MHz RF oscillator and the 32kHz crystal controlled oscillator. The 303MHz oscillator consists of a self-oscillating circuit made up of the coil….(diagram added 05/07)