[GreenKeys] Building my own power supply

[Skip Macaulay]

This punch unit has to be something different that I am used to playing
with..
Skip

Skip MacAulay
VE6BGT

On Sat, Aug 12, 2023, 10:58 PM w9ddd at tapr.org, <w9ddd at tapr.org> wrote:

> An original  power supply for the 19 was to supply the current for punch
> magnet.
>  I'm thinking the original bell system PS I had was rated at 900 mA. There
> must have been
> 3 or 4 different designs over the years.  There was the one with the nice
> blue glow tubes,
> The simple transformer with a selenium rectifier stack and L C filtering.
> Then there were
> The ones that regulated with some weird combination L and C that was
> called something like
> Ferromagnetic resonance regulation.  (Sola made a line of these just to do
> a range of
> 100-150? AC Input, 117 AC regulated output)
>
> Navy Radio has a document or 2 with schematics of the various types.
>
> ---
> ----
> You said "tomorrow" yesterday.
>
>
> The above comments or recommendations are SWAG. Use at your own risk.
>
> John, W9DDD
>
> On Aug 12, 2023, at 11:23 PM, Skip Macaulay <ve6bgt at gmail.com> wrote:
>
> Why a switching supply and also why a high current rating of 830
> milliamps?? Isnt this just for the magnet loop supply? Unless I dont get
> what your doing the loop supply for my model 19 was only 60 milliamps..
>  Skip
>
> On Sat, Aug 12, 2023, 9:13 PM Windows XD, <antech6586856 at gmail.com> wrote:
>
>> Also I'm fine with, almost prefer if it were tube operated, although I'm
>> not sure if that would push it beyond my skill level.
>>
>> On Sat, Aug 12, 2023 at 11:10 PM Windows XD <antech6586856 at gmail.com>
>> wrote:
>>
>>> Dear Greenkeys community,
>>>
>>> I'm trying to build my own power supply for my Teletype model 19, it
>>> needs 120-130VDC of power @ 830Ma. I'm working on a circuit for it, but I
>>> don't exactly know what I am doing because I've never done this before.
>>> Would you let me know if I am on the right track to building a switching
>>> power supply?
>>> P.S. I know it needs a snubber circuit somewhere and none of the actual
>>> switching circuitry is there, I don't know enough to know what goes where.
>>> [image: circuit.png]
>>>
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>
> Skip MacAulay
> VE6BGT
>
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