Standard Circuit for Electromagnetic Gear Clock

For those building the Electromagnetic Gear Clock from Gizmos and Gadgets magazine or Making Wooden Gear Clocks magazine, we offer a complete electronics kit with circuit board, battery box, coil, and magnet.


If kits are in stock, I normally ship within 2 business days.  If out of stock, there can be up to a 2 week delay.

In the US

             US only

Shipping via Priority Mail is $7.05. Click the Buy Now button to order and pay via PayPal or credit card.



If ordering multiple kits, DO NOT click Buy Now. Email dick@carveshop.com with your shipping address, and I will send you an invoice with correct shipping cost for multiple kits.


Outside the US

Shipping via Priority Mail is $20.85.  Shipping via First Class Package is much less expensive and varies by your location. Email dick@carveshop.com with your shipping address, and shipping preference.  I will contact you regarding shipping options and cost.

Gizmos and Gadgets Clock Building Tips

The clock designer used AA batteries.  These will work, but the clock will not run very long.  I use 4 D cells in my clocks, which will run about 2 months. You can also use a 6 volt DC power supply (which you would need to wire yourself).

I do not provide a slide switch, as it is not really needed. The circuit is triggered by the passing magnet.  If the magnet is not moving, the circuit draws virtually no current at all.

Locate the magnet as close to the coil as possible.

The build photos show the electronics and battery box in line with the swing of the pendulum.  It is better to locate these away from the pendulum so that the magnet does not pass directly over them.

Set the Gain to 50.  Set the Pulse as low as possible while still allowing the clock to operate properly - generally about 20%.

The magnet and coil polarities must be aligned. Without changing the Pulse, flip the coil. Whichever orientation yeilds the larger swing angle of the pendulum is correct.

If you are building a different clock, the Standard Circuit is quite versatile and can be used in a variety of clocks.


The standard electromagnetic drive circuit uses a fixed pulse width that can be adjusted via a trim potentiometer. The gain of the trigger can also be adjusted. This drive is suitable for a wide variety of pendulum designs.



The microcontroller drive adjusts the pulse to the pendulum to maintain accurate time. It works only with a 1 second period pendulum, and the pendulum and mechanism must be able to tolerate variation in swing angle of at least 15 to 25 degrees. This circuit will not work with the Electromagnetic Gear Clock published plans!



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