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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 18th Dec 2017, 4:34 pm   #1
merlinmaxwell
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Default New Magneta 36 (PO 36) clock power supply.

I have made a new, completely over the top, power supply for my Magneta master clock which runs a few dials over the house too. The supply did develop a fault soon after introducing it, see https://www.vintage-radio.net/forum/...04#post1000804

Now working well, the meters are top to bottom...

Various voltages, Hipp supply (5V), dial supply (15V), sync/system/battery at 21V and the input to the regulators (about 33V).
Fast/Slow meter, using MSF and the one minute pulses from the 60 second wheel.
Various currents, 5, 15 and 21V plus battery which is a centre zero.

Below is the three 6V sealed lead acid batteries for backup, float charged at 21V with switch and fuse, I put negative to the switch body so I can measure the battery voltage to the fuse.

The synchroniser is pulsed (again from MSF) at 8 and 2 am/pm to reset the 30 second pulse wheel, this is done twice with a six second gap to stop the +/- one second error a single pulse can give to a synchroniser depending upon which way it is corrected.

All jolly good fun, very OTT and very pretty.
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Old 18th Dec 2017, 4:40 pm   #2
M0FYA Andy
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Default Re: New Magnata 36 (PO 36) clock power supply.

Excellent.
Can you give some details of the MSF to synchroniser circuitry, please?
I have a PO36 with a synchroniser which I really should get running.
Many thanks,
Andy
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Old 18th Dec 2017, 5:13 pm   #3
merlinmaxwell
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Default Re: New Magneta 36 (PO 36) clock power supply.

Quote:
Can you give some details of the MSF to synchroniser circuitry, please?
It's done with a PIC and an MSF receiver, you should be able to work out how to wire it from the source code, would you like that by PM? I have found some MSF receivers too if one would be of use.
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Old 18th Dec 2017, 9:53 pm   #4
M0FYA Andy
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Default Re: New Magneta 36 (PO 36) clock power supply.

I've no experience of PICs, and have too many other projects to find time to learn, so thanks but I'll pass on that one!
I do have a unit which I bought years ago from chap in Holland which is supposed to do the whole job, I really ought to get it working!
Andy
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