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Doorbell Circuits
Door Bell Circuits:  #-D      E-R      S-Z

Last Updated on: Sunday, July 26, 2015 07:09 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 . . . [Circuit by Dave Johnson P.E.,  06/04/00]

 

Basement Remote Doorbell -  This circuit will activate a beeper alarm whenever the AC line voltage is less than 100vac . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/11/06]

 

Door Knob Alarm -  Many companies offer simple alarm devices for personal use in bedrooms or hotel rooms. A metal chain attached to a box holding the electronics is placed around the inside doorknob of a wood door. Anyone grabbing the knob from the outside is detected . . . [Circuit by David Johnson P.E.,  05/29/00]

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 . . . [Circuit by Dave Johnson P.E.,  06/14/09]

 

Doorbell heard in Basement -  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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

2-tone doorbell using 555 timer -  No circuit description, schematic only. . .  [CdS Electronic's website]

 

3 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]

 

Add a door-chime repeater -  05/13/99 EDN Design Idea   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 effectiveness by repeating the chime strike for as long as the pushbutton remains depressed. The circuit controls both front and rear chimes. The heart of the circuit is timer IC2, which you configure as an astable multivibrator. The timing components, R1, R2, R3, and C3, provide the required pulse widths. . .  [by Dennis Eichenberg, Parma Heights, OH]

 

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 . . . [Circuit by Dave Johnson P.E.,  06/04/00]

 

Basement Remote Doorbell -  This circuit will activate a beeper alarm whenever the AC line voltage is less than 100vac . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/11/06]

 

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. . .  [Circuit by Andy Collison]

 

Crank Doorbell -  Here is an interesting hobby circuit of a “crank” door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact battery is enough for powering the whole gadget. Timer IC (NE555) is wired in monostable mode to produce a time out. . .  [Circuit Posted by T.K. Hareendran]

 

Ding Dong Touch Bell -  “Ding dong bell” is a popular nursery rhyme. Shake-speare used the phrase “ding dong bell” in several plays. Today, ding dong is a popular ringtone used in phones and door bells. Here is a simple ding dong tone generator circuit built around a dedicated analogue IC. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Ding-Dong Bell -  . . . 

 

Door Knob Alarm -  Many companies offer simple alarm devices for personal use in bedrooms or hotel rooms. A metal chain attached to a box holding the electronics is placed around the inside doorknob of a wood door. Anyone grabbing the knob from the outside is detected . . . [Circuit by David Johnson P.E.,  05/29/00]

 

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 . . . [Circuit by Dave Johnson P.E.,  06/14/09]

 

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 heard in Basement -  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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]

 

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]

 

Doorbell with Security Feature -  This doorbell system works such that when someone presses your calling bell switch during the night, not only the bell rings but the bulb connected to it also glows. In order to turn the bulb off, just press the reset pushbutton switch provided in the circuit. Place the bulb near the calling bell switch so that you can see the person pressing the calling bell before opening the door. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Doorbell-Controlled Porchlight -  This add on circuit automatically turns on your porchlight when your doorbell rings, so you can see the person ringing the doorbell at the doorstep. This also helps to guard against burglars, who usually press the doorbell switch to confirm that there is no one at home. By turning on the porchlight, the circuit will trick them into believing that someone is inside the home. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Doorbell-controlled Security Switch -  One way to check whether anybody is at home is to ring the doorbell. Burglars too use this very technique. The circuit described here comes handy in such a situation. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Doorbell-Cum-Visitor Indicator -  This doorbell circuit can also give identification of the visitor to your home in your absence. When you’re home, you can use it simply as a normal doorbell. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

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Door Bell Circuits:  #-D      E-R      S-Z


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