Different types

We have four different regular pulse drivers, as shown above. Each is suited to a particular type of movement, depending on its (electro)technical control.

Voltage and current

Many clocks have a fixed pulse voltage, for example 24 volts, and pulse once per minute. But there is also the 'French system'. These do not have a fixed voltage, but a fixed current. And then there is the 'English system', which also works with a fixed current, but with higher values than the French system.

How often does it pulse?

Most 12/24V clocks use 1 pulse per minute. French and English clocks generally require 1 pulse every 30 seconds. However, this so-called pulse frequency can vary. For example, there are 24V clocks that require a pulse every 30 seconds.

Special

And then there are three types classified as special (not yet included in the overview):

• Type 12/24V MIN + SEC pulse output; for clocks with two pulse movements: one for the minutes/hours and a separate one for a seconds hand (or 2.5-second hand/“Suchzeiger”). Note: the NS station clock does have a seconds hand, but it runs on 230V mains voltage.
• Type 7/12V; this is similar to the 12/24V pulse generator, but with adjustable 7 or 12 volt pulses.
• Type ‘Special‘, with settings tailored to one particular clock!