[GreenKeys] Fwd: TELETYPE CORP. power supply ?

[Paul Kasley]

I have the schematic. It is not a linear supply. The line is transformer 
coupled, rectified, and filtered. The bulk DC is then fed to bucking 
converters to regulate to the output voltages. The bucking converters 
operate at variable frequency instead of variable pulse width. I don't 
know how dirty the 40PSU101 is WRT it's suitability for powering a 
radio. At the time TTY designed the M40, they had concerns about the 
safety of off-line switchers vs transformer input.

Paul Kasley W9TS

On 3/19/2015 5:27 AM, Nick England wrote:
>
> 40PSU101 schematic needed
>
> Begin forwarded message:
>
>> *From:* "Hue Miller" <kargo_cult at msn.com <mailto:kargo_cult at msn.com>>
>> *Date:* March 18, 2015 at 11:22:20 PM EDT
>> *To:* <tetrode at googlegroups.com <mailto:tetrode at googlegroups.com>>, 
>> <milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net>>
>> *Subject:* *[Milsurplus] TELETYPE CORP.  power supply ?*
>>
>> I removed an abandoned TELETYPE CORP. printer desk from a work office 
>> and removed a power supply from it before I sent it to metal scrap. The
>> power supply is ' 40PSU101 '.  I know  this is a real longshot, but 
>> I'd appreciate any leads on getting a schematic. From papers that came
>> with it, for various datacom and printer interface cards, I gather the
>> build date was around 1977. It looks to me like an analog, not 
>> switching supply; the power transformer is pretty hefty and I don't 
>> see any complex switching parts including HV lytics.  The outputs
>> are +-12. Altho it hadn't seen power in 20+ years, I went ahead and
>> plugged it in - nothing to lose. The + and - 12 DC were good, but 
>> after a few minutes the transformer started to complain. I shut it
>> off and felt the heat sink around one transformer, quite hot. I think 
>> I'll
>> have a look and see if anything looks toasted. I found references to
>> it on the net but all just places to request quote or cross reference
>> numbers. It looks like if working it could drive various mil-surplus
>> 24DC driven radios, but if it looks too difficult to figure out, it
>> will go to the cauldron also.
>> - Hue Miller
>
>
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