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Ding Dong Bell Circuit that Saves Electricity

Last Updated on January 1, 2024 by Swagatam Leave a Comment

This circuit goes beyond being a simple two-tone doorbell. Instead, it utilizes envelope modulation to produce an authentic 'ding-dong' chime sound.

Table of Contents
  • Circuit Diagram
  • How the Circuit Works
  • Parts List
  • Ding Dong Bell Circuit using Two IC 555
  • Parts List

Additionally, it incorporates a power-saving feature, consuming zero power in standby mode.

Circuit Diagram

warning message: electricity is dangerous, proceed with caution
ding dong bell circuit schematic
The IC 4017 is mistakenly shown as IC1, it should be IC2

How the Circuit Works

When SW1 is pressed, it triggers Q1 to power the remaining circuitry.

IC1a serves as a low-frequency oscillator, generating clock pulses for the decade counter IC2.

Q2 activates when the counter reaches zero, sustaining power for a complete cycle.

The envelope, characterized by rapid attack and gradual decay, is shaped by D4, C3, and R8 during the initial count.

Q4 modulates the output of the audio oscillator IC1d, which then feeds into amplifier Q5 and the loudspeaker. When the counter reaches count 5, a new envelope begins using D5, C3, and R8.

Simultaneously, the carry-out pin goes low, introducing C4 in parallel with C5 to produce the deeper 'dong' sound.

Upon reaching count 9, the counter is reset, and Q1 and Q2 are deactivated through IC1b, making the circuit ready for another ringing cycle.

Parts List

  • All Resistors are 1/4 watt 5% CFR
  • R1 = 330 Ohms
  • R2, R3 = 2.7 K
  • R4 = 47 K
  • R5 = 6.8 K
  • R6, R9, R10, R12 = 100 K
  • R7, R11 = 22 K
  • R8 = 12 K
  • R13 = 150 K
  • R14 = 220 K
  • Capacitors
  • C1 = 220 uF / 25 V Electrolytic
  • C2, C3 = 10 uF / 25 V Electrolytic
  • C4 = 200 nF Ceramic
  • C5, C6 = 100 nF Ceramic
  • Semiconductors
  • Q1 = 2N2907
  • Q2, Q3, Q4 = BC547
  • Q5 = BC517
  • IC1a, b, c, d = Gates from IC 4093
  • IC2 = 4017
  • SW1 = push button
  • LS1 = 64 ohm Loudspeaker

Ding Dong Bell Circuit using Two IC 555

555 ding dong bell circuit

This circuit generates the iconic chime of the Big Ben clock. When activated, it emits the characteristic "ding dong" sound.

Fundamentally, the circuit switches back and forth between two frequencies, which can be customized. This action results in the formation of the "ding-dong" sound.

The initial integrated circuit (IC1) generates oscillations at approximately 1Hz. The subsequent integrated circuit (IC2) is influenced by the fluctuating voltage from the first IC, which modulates the tone.

The speed of the transition between the two frequencies is governed by IC1, determining the switching pace. On the other hand, IC2 influences the quality of the sound produced in the end.

By manipulating potentiometer VR1, the rate of frequency alternation can be fine-tuned, and by adjusting potentiometer VR2, the pitch of the sound can be modified.

Parts List

  • Resistors are 1/4 watt 5% CFR
  • 2.2 K = 2nos
  • 100 K = 1no
  • 47 K preset = 1no
  • 100 K preset = 1no
  • Capacitors
  • 0.01 uF Ceramic = 1no
  • 0.1 uF Creamic = 1no
  • 100 uF / 25V = 1 no
  • Semiconductors
  • IC 555 = 2nos
  • Loudspeaker 8 ohms 1/2 watt = 1no
  • Battery 9 V = 1no
  • Push button Switch = 1no

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Filed Under: Audio and Amplifier Projects Tagged With: Bell, Ding, Dong, Electricity, Saves

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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