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Doorbell Circuits
Last Updated on:
Monday, October 03, 2011 06:07 PM |
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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.
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- Basement
Doorbell
This circuit will activate a beeper in the basement, whenever the front doorbell is
pressed.
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- 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...
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Basement Doorbell - This circuit will activate a beeper in the
basement, whenever the front doorbell is pressed..... [Designed by David
A. Johnson] |
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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. …. [Hobby Corner Circuit by Dave
Johnson] |
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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] |
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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] |
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Ding-Dong Bell - ..... |
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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] |
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Doorbell Chime - .... |
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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] |
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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] |
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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] |
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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] |
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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]
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Multi-Switch Doorbell with Indicators - ..... |
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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] |
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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)
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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] |
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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] |
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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) |
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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] |
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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) |
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Doorbell Circuits |
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