12/24V pulse driver

 89,00 incl. tax

The 12/24V pulse driver provides adjustable 12-volt or 24-volt pulses and can also work on batteries.

  • Includes battery box for 4x 1.5V AA batteries (batteries not included)
  • Including connection terminals
  • Included Velcro for attachment
iDEAL Bancontact Sepa GiroPay Paypal

Suitable for electric slave clocks from CTW Siemens TN Pragotron Moser Baer Favag Bosch Inducta Nedklok Solari Udine Westerstrand IBM / Simplex Ericsson Rolex Bürk and more...

  • Choose between 12 or 24 volt pulses by means of a switch.
  • For one or two clocks (double-sided clock)
  • Power supply: DC jack and micro-USB connection.

The 12/24V pulse driver provides adjustable 12 or 24 volt pulses every minute and can also run on batteries. It is not radio-controlled and must be manually set to the correct time using a button to generate pulses. Since there is no time synchronization, daylight saving time changes are not adjusted automatically. The electronics inside the pulse generator generate the higher pulse voltage of 12 or 24 volts from the low supply voltage, so no separate power supply is required.

By default the 12/24V pulse driver is delivered with the following configuration. This is suitable for the vast majority of 12/24V clocks:

Configuration-option Setting
Pulse frequency one pulse per minute or one per second
Pulse durations 150, 200, 250 of 300 milliseconds (medium)
Pulse polarity Alternating (bipolair)

Check 'configuration options' for all possibilities. It can also be adjusted later by yourself.

Measure the resistance of a clock movement with a multimeter to get an indication of whether it is still working properly.

The measured resistance is expressed in ohms, symbol Ω. Values higher than 1000 are often displayed in kilo-ohms (k=1000). 4500 Ω would then be written as 4.5 kΩ.

Measured resistance

This table shows the expected resistance values for different pulse voltages.

Clock movement with pulse voltage Resistance (approx)
6V c.a. 600 Ω
12V 1 kΩ tot 3,5 kΩ
24V 3,5 kΩ tot 5 kΩ
48V 9 kΩ tot 11 kΩ
60V 14 kΩ tot 16 kΩ
  • Measure without the clock electrically connected.
  • A very low value hints at a short, possibly in the coil
  • A very high resistance most likely means a coil that is defective or a bad electrical connection between the connector and the coil

Clocks are often adjustable to work on different pulse voltages. By setting them to 24 volts, for example, a 60-volt clock can still be used with this pulse generator. This can often be achieved by rearranging the connections between a row of screws

A 6V clockwork measures a low resistance of approximately 600 Ω. These clockworks occur sporadically, almost always pre-war. Ask for our special 7/12V pulse generator for this!

There are clockworks that deviate from the expected resistance values described above, for example
Westerstrand pulse clocks. These measure approximately 1500 to 1700 Ω, but are driven by 24V pulses
Westerstrand pulsklokken. Deze meten circa 1500 tot 1700 Ω, maar worden met 24V pulsen aangestuurd.

Connecting a double-sided clock (two separate clockworks) to 1 pulse generator is possible!

This pulse generator provides voltage-controlled pulses. Multiple clockworks are thus connected in parallel to the pulse generator

Sometimes one of the clockworks remains 1 minute behind after setting the time. In this case, the magnetic field of the coil points in the opposite direction. Rotate the pulse connection of this clockwork. By swapping the plus and minus, the polarity between the odd and even minutes is reversed. Set the hands to the correct time again, and give a few pulses to see the result

Battery powered!

The pulse generator can be connected to a fixed power supply in addition to batteries. A generic USB adapter (phone charger) can also serve as a power supply through the micro-USB connection

For details about the power supplies, see:


Dimentions pulse driver
65 x 40 x 20 mm (LxBxH)

Dimentions battery box
70 x 65 x 20 mm (LxBxH)

On time!

The pulse generator uses a crystal oscillator as a time base. The crystal is temperature-compensated and deviates a maximum of 4 seconds per month.

For each pulse generator, we adjust the internal time base as precisely as possible. However, after a few years, there may be some aging, which is why we use the four-second range as the bandwidth within which the deviation lies.

Changing the configuration

The basisconfiguratie kan bij de nieuwste generatie pulsgevers aangepast worden via het configuratie-menu.