Clock Tick-Tock Sound Generator & LED Pendulum
Wall clocks with pendulums that have a wooden case and are powered by batteries can be purchased on the market. Some of these clocks feature a tick-tock sound generator. Some of them even…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Clock Tick-Tock Sound Generator & LED Pendulum is a electronics project. Wall clocks with pendulums that have a wooden case and are powered by batteries can be purchased on the market. Some of these clocks feature a tick-tock sound generator. Some of them even…
- Source pages
- 250-252
- Named parts
- 4
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
Speaker
An output component turns an electrical control signal into light, sound, motion, switching, or displayed information.
What it does hereIt presents the circuit result or acts on the physical world.
Buy / compare this part ↗Advantages
- Makes system state visible
- Can be tested separately
- Supports clear troubleshooting
Limitations
- Loads may exceed controller current
- Polarity or driver direction can matter
- Inductive loads create voltage spikes
Handling
- Use the documented driver stage
- Check polarity and load current
- Add flyback protection for inductive loads
Specifications to verify
- Use the exact model, value, package, and rating listed for Speaker; similar-looking parts are not always interchangeable.
- Confirm voltage, current, polarity, interface, driver requirements, and duty cycle.
What's this?Image, role, pros, cons, handling & specifications
PASSIVE LEARNING VIEW1N4148
A passive component sets current, voltage, timing, filtering, or signal behaviour without adding gain.
What it does hereIts exact value and tolerance determine how the surrounding stage behaves.
Buy / compare this part ↗Advantages
- Simple and dependable
- Low cost
- Easy to measure before installation
Limitations
- A wrong value can stop or damage the circuit
- Ratings must not be exceeded
- Polarized parts require correct orientation
Handling
- Measure unclear values
- Observe capacitor polarity
- Avoid overheating leads while soldering
Specifications to verify
- Use the exact model, value, package, and rating listed for 1N4148; similar-looking parts are not always interchangeable.
- Confirm value, tolerance, power or voltage rating, polarity, and package size.
What's this?Image, role, pros, cons, handling & specifications
LED1, LED2, LED3, LED8 - indicator LEDs identified in the circuit
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for LED1, LED2, LED3, LED8 - indicator LEDs identified in the circuit; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
PART LEARNING VIEWVR1, VR2 - preset potentiometers identified in the circuit
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for VR1, VR2 - preset potentiometers identified in the circuit; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Clock Tick-Tock Sound Generator & LED Pendulum: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 3 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteWall clocks with pendulums that have a wooden case and are powered by batteries can be purchased on the market. Some of these clocks feature a tick-tock sound generator. Some of them even have bells. The sound of old-fashioned mechanical pendulum clocks ticking away is something that is lacking.
Fig.1 Circuit of tick-tock sound generator The schematic for a sound generator that goes "tick-tock" is displayed up there. It is constructed around a timer IC 7555 that has been wired as an astable multivibrator (IC1). The preset VR1, resistor R1, and capacitor C1 work together to generate frequencies, and those frequencies can be adjusted with the help of the preset VR1. Wooden clock design The sound of a tick-tock is generated by a small speaker that is connected to the output pin 3 of IC1 by means of the capacitor C3. Additionally, two yellow LEDs are attached to pin 3 of IC1 on the face of the clock so that they flash in sync with the sound (see Fig. 2). Adjust the preset VR1 so that the ticking sound is quite similar to the tick-tock that is produced by traditional pendulum clocks. The wooden clock looks great with the yellow LEDs (LED1 and LED2) that are on it.
LED pendulum circuit The circuit for the LED pendulum may be seen in the image below. It makes use of a different timer 7555 wired in astable mode, and the clock pulse from that timer's pin 3 is supplied to the clock pin 14 of the decade counter 4017. (IC3). The outputs of IC3 are connected with the assistance of the switching diode 1N4148 in such a way that the six LEDs (LED3 through LED8) flash in succession in one direction at first, and subsequently in reverse sequence. With the use of a 10-kilohm setting on VR2, one is able to alter the rate at which the LEDs flash. For the purpose of resetting the decade counter, capacitor C6 has a value of 6.8 nanofarads, and resistor R11 has a value of 100 kilobohms.
You built Clock Tick-Tock Sound Generator & LED Pendulum.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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