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Striking Clock circuit - Answered

I am a hobbyist trying to add a striking feature to an existing clock.

My clock is a quartz movement with a set of contacts that close briefly every time the hour hand passes the 12 position. This pulse is used to trigger a solenoid which when energised causes a plunger to strike a bar and produce a resonant bell sound. I include the cct. I am currently using. The 6v. battery powers the 10 ohm solenoid coil & U2 the LD1117 IC which provides the 1.5v needed by the quartz movement.

My project is to change the hourly strike from a single stroke to one which strikes the hour the correct number of times to indicate the time, the same as a mechanical striking clock does - 1 stroke at one oclock - 2 strokes at 2 oclock etc.continuing to 12 and then beginning again at 1 oclock. Unfortunately my electronic ability does not extend to using counters and timer ccts so I am looking for help with my project. I would greatly appreciate any help with the circuitry needed to allow me to complete this project. TIA, RMHC.


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10 months ago

I have been thinking about this myself for a while and just read your post. As you will have guessed there is not a simple solution to this. If there was then the answer would be out there for all to see or at least there would be quartz carriage clocks available that struck the number of hours.

There are two routes to take, either electronic or electromechanical and each of those can be subdivided into two. With the electronic route there are programmers but I know nothing about using them and feel I would be way out of my depth here. Alternatively there are decade counters which could be used to count out the hours. I am currently working on this and think I may be getting somewhere but unless I can refine my ideas it will take about 30 ICs!

With the electromechanical route there are Strowger switches as once used in telephone exchanges. One or more of these could potentially be wired to advance the required number of positions upon successive activations. Otherwise a motor driving two wheels at about 15-20 rev/hour and notches around the circumference to operate micro switches. One switch keeps the motor running after activation while the other sends pulses to a striker circuit. I hope this gives you some food for thought and I will be happy to elaborate further on any of these ideas if you wish.

Good luck with your project!