Thank you kindly for allowing me to join your forum.
Through an unusual and unexpected circumstance, I became the owner of my old elementary school's master clock about 30 years ago after a brief conversation with my former and retired principal who had kept it stored in his garage after it had outlived its usefulness. To say I had developed an obsession with the Standard Electric classroom slave clocks as a kid would be an understatement.
Since 2013, I have been slowly collecting vintage Standard secondary clocks ranging in age from 1939 to 1972 off of Ebay, successfully running them in sync using a little $90 Piexx 2" x 2" impulser that I power with a 5v adapter.
My greatest desire is to run my clocks from the master but my knowledge of things electrical is probably just enough to get me into trouble.
My understanding to date (if correct) is that the three cam driven contacts on the master open and close according to their respective designs, one that controls the minute by minute secondary clock impulse, one for the corrective reset on the 58th minute of each hour and one for regulating the length of time the bells ring.
I am hoping to learn two things:
(1): What specific type of power source(s) or transformer(s) would be used to convert or transform the voltage to 24vdc to drive the secondary clocks as well as the 58th-minute 48vdc override that releases the mechanism for any corrections?
(2): Which terminal points or leads on the master would be used to connect to these sources.
I have the punch tape that would drive the bell program (which I think is what most of the electronics on the lower half of the master clock contains), however, I am only interested in running the clocks?
Thank you again.
Geoff
Through an unusual and unexpected circumstance, I became the owner of my old elementary school's master clock about 30 years ago after a brief conversation with my former and retired principal who had kept it stored in his garage after it had outlived its usefulness. To say I had developed an obsession with the Standard Electric classroom slave clocks as a kid would be an understatement.
Since 2013, I have been slowly collecting vintage Standard secondary clocks ranging in age from 1939 to 1972 off of Ebay, successfully running them in sync using a little $90 Piexx 2" x 2" impulser that I power with a 5v adapter.
My greatest desire is to run my clocks from the master but my knowledge of things electrical is probably just enough to get me into trouble.
My understanding to date (if correct) is that the three cam driven contacts on the master open and close according to their respective designs, one that controls the minute by minute secondary clock impulse, one for the corrective reset on the 58th minute of each hour and one for regulating the length of time the bells ring.
I am hoping to learn two things:
(1): What specific type of power source(s) or transformer(s) would be used to convert or transform the voltage to 24vdc to drive the secondary clocks as well as the 58th-minute 48vdc override that releases the mechanism for any corrections?
(2): Which terminal points or leads on the master would be used to connect to these sources.
I have the punch tape that would drive the bell program (which I think is what most of the electronics on the lower half of the master clock contains), however, I am only interested in running the clocks?
Thank you again.
Geoff








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