Gents GPO master clock 30 seconds impulse debouncer.<br />By adding this circuit into the drive circuit of the GPO, the occasional double bouncing of the contacts can be avoided. It also improves the accuracy of the GPO's timekeeping.<br />The 220 mA slave dial current has been taken away from the clock contacts. When these get older and a bit worn, the bouncing problems start gradually appearing.<br />The latter switches now only the base current to the BD647 or eq. transistor.<br />Time constant is set by a capacitor.<br /><br />In the second part of the video I have used the same circuit to drive a synchroniser to keep an other pendulum clock in synch. This can be duplicated for more clocks, and I will add an other video to show the set up, when I have wired it all up in my spare time.<br />On the second circuit I made the timeconstant shorter (1/2 to 3/4 sec) to have the perfect pulse duration to keep the pendulum in synch.<br /><br />Dependant upon the weight of the other slave pendulum a longer or shorter impulse may be required.<br />This can easily be changed by changing the capacitor or the bleed resistor to a different value.<br />I forgot to add the schematic to this video. Just drop me an email and I will sent it to you.<br /><br />17 Oct 09. I have synched two more Bürk master clocks from this set up. basically these 3 similar Bürk clocks all run off the same relay and run in perfect synchronisation with the Gents GPO.
