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Doorbell Circuits
Last Updated on: Friday, October 03, 2014 10:36 AM

Circuits Designed by Dave Johnson, P.E. :
  • 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
    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... 
  • Illuminated 16vac Doorbell Lamp Replacement 
    A while back I noticed that the lamp inside the illuminated pushbutton switch for my doorbell burned out.  I carefully removed the doorbell, opened the switch housing and then replaced the incandescent lamp inside with the circuit shown below.  The circuit uses two small but very bright green LEDs from King Bright.  The resistor sets the average LED current at about 3ma. The diode prevents reverse biasing the LEDs.  The two lamps emit plenty of light and should last much longer than the incandescent lamp they replaced.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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. …. [Hobby Corner Circuit by Dave Johnson]
Birdie Doorbell Ringer -  P1 is of experimental value. Start with 220 Ohms or so and modify to suit your needs. The transistor is a general purpose kind and is not critical, almost any PNP type will work. L1 is a bell-transformer which is usually already present in the house. If you wish, you could use a battery instead of the bell transformer. Just hookup a 9-volt battery (or wall adapter)to points 'A' and 'B' (A=+) the diode (D1) is to protect the circuit from accidental polarity reversal and is optional, but required as a rectifier for use with the bell transformer.…. [Tony van Roon's circuit]

Counter with Doorbell -  This circuit uses a synthesized sound chip from Holtek, the HT-2811.  This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.....(electronic design added 6/07) [Circuit by Andy Collison]
Ding-Dong Bell -  .....
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 -  ....
Doorbell for the Deaf -  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..... by Andy Collison]
Doorbell Indicator -  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.... [Circuit Design by Andy Collison]
Doorbell with Counter -  This circuit uses a synthesized sound chip from Holtek, the HT-2811.  This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors.… by Andy Collison]
Electronic Canary Doorbell -  This circuit is a modified "Hartley Oscillator" with a couple extra parts.  T1, the LT700 (Tony van Roon's or equivalent, is a small center tapped (Tony van Roon's 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 (Tony van Roon's 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..... [Tony van Roon's circuit]
Fix Adds Door Chime Repeater -  05/13/99 EDN-Design Ideas.....Electromechanical door chimes can enhance your home, but they are vulnerable to costly repair problems. A defective pushbutton switch or a careless visitor can maintain the chime in an energized state for a prolonged period, thereby damaging the chime. The circuit in Figure 1 prevents damage to the chime and improves the chime's effectivenessElectromechanical door chimes can enhance your home, but they are vulnerable to costly repair problems. A defective pushbutton switch or a careless visitor can maintain the chime in an energized state for a prolonged period, thereby damaging the chime. The circuit in Figure 1 prevents damage to the chime and improves the chime's effectiveness..... [Design Idea by Dennis Eichenberg, Parma Heights, OH]
Illuminated 16vac Doorbell Lamp Replacement  - A while back I noticed that the lamp inside the illuminated pushbutton switch for my doorbell burned out.  I carefully removed the doorbell, opened the switch housing and then replaced the incandescent lamp inside with the circuit shown below.  The circuit uses two small but very bright green LEDs from King Bright.  The resistor sets the average LED current at about 3ma. The diode prevents reverse biasing the LEDs.  The two lamps emit plenty of light and should last much longer than the incandescent lamp they replaced. [Circuit Designed by David Johnson, P.E.]
Multi Pulse Generator - I used this circuit to ring my doorbell rapidly three times when a car pulled into my driveway.  R2 and C2 set the output frequency.  Use a diode and resistor to change the duty cycle, if desired.  R1 and C1 set the cycle time which sets the number of pulses.  R3 can be deleted if you have other loads on the power supply.  The circuit is activated by applying power to it.  The first pulse with be longer than the others. [Designed by Andrew R. Morris]
Parasitic Power Supply - This circuit powers a remote doorbell transmitter when a passive IR sensor light was triggered.  It had no noticeable effect on the sensor light performance. [Designed by Andrew R. Morris]
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..... by Andy Collison]
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.....Electromechanical door chimes can enhance your home, but they are vulnerable to costly repair problems. A defective pushbutton switch or a careless visitor can maintain the chime in an energized state for a prolonged period, thereby damaging the chime. The.....PDF contains many circuits, scroll to find this one.… [Design Idea by Dennis Eichenberg, Parma Heights, OH]
Three Flashing LED Doorbells -  These circuits combine a buzzer with one or more LED displays. When the push switch is operated, the buzzer will sound and the LEDs will flash. When the switch is released, the buzzer will stop, but the LEDs will go on flashing for another 30 seconds or so.,,, [Ron J.'s circuit]
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..... [Posted by Jospfh]
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)

 

Doorbell Circuits


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