Re: DC Power sources for a 1920's Synchronome master & Current Regulation?

Andrew Nahum

I use 2 Duracells in series and the clock works well but it has to be in good adjustment on all the contact arm gaps etc. They last about a year. My impression is that more volts give more noise.

On Tue, Mar 2, 2021 at 3:54 PM John Hubert <jfphubert@...> wrote:
The master draws 300 - 350 mA …….. but the duty cycle is low; approximately 100 - 150 mS every 30 seconds, so the average is low.


On 2 Mar 2021, at 15:31, Thomas D. Erb <tde@...> wrote:

I'm not familiar with this type of master - but if it is really voltage-sensitive you can also use a diode - each diode will subtract .7 volts from the power supply.

alkaline batteries nominal voltage is 1.5VDC so 3 in series would give you 4.5VDC. 

If the master really draws 350ma - you would'nt get a lot of life - 
A D cell battery will give you 12000-18000 mAh
12000/350=34.2857 to 18000/350=51.4286

so between 34 and 50 hours of run time.  

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