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> Switching Power Supply, Aarrgghh!
cgriggs
Posted: June 10, 2017 03:58 pm
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From our local ham club I was able to obtain a Motorola Police radio that had been converted to two meters. Knowing the dependability, etc of the brand I felt that it was a terrific bargain.

Then I realized I'd need a 12 volt power supply for it. Well, the "plug-in" units wouldn't allow me to transmit so I checked out ebay. (In the old days I'd begin looking for the parts to build one from scratch.)

I found a 360 watt switching power supply that I felt should be hefty enough to do the job. It was less than 20 dollars so I bought it.

All went well as far as the hooking up, but the instant I hit the mike all hades broke out with the DC-40 receiver on the bench. If I could sell spurious radiation for a dime a bushel basket full, I'd be one happy man!

The saying comes to mind: "From everything bad, comes something good." After a dismantling, I have a great looking box for a future project. I'm happy.
Now, to look for parts to build a power supply! LOL

Charlie

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dmg
Posted: June 10, 2017 04:21 pm
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can you findle with the output voltage ?
if so you may be able to bump it up a bit to allow headroom for a proper regulator and stuff to filter it..
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cgriggs
Posted: June 10, 2017 06:43 pm
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I don't know, but I'm going to leave well enough alone. I'm looking for parts, although I'm wondering about the transformer. It may be a stumbling block to the project. In that case, a motorcycle, (or should I say a "motorhertz)", battery should do the job, with a trickle charger attached.
Time will tell.
Charlie
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MacFromOK
Posted: June 11, 2017 02:54 am
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If you're going the battery route, you might look into an SLA (sealed lead-acid) battery such as computer backup supplies use.

Vehicles batteries are not sealed and require ventilation to prevent ka-boom gasses from forming. biggrin.gif


--------------------
Mac *

"Basic research is what I'm doing when I don't know what I'm doing." [Wernher Von Braun]

* is not responsible for errors, consequential damage, or... anything.
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cgriggs
Posted: June 11, 2017 04:57 am
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Thank you, Mac! exactly what I'll do. Good thinking!
Charlie
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