[GreenKeys] Building my own power supply

[Skip Macaulay]

If I recall it had the perforator on the left side of the machine.. It was
quite a long time ago but I have pixs of it.. I know for a fact I didnt
have more than around 60 ma going through it.. All my machines back then
were on a common loop, I could switch them in and out.. The only one
seperate was the 28 I still have today and it was seperate cause it was
geared for 100 wpm and used a electronic UART circuit to convert it up from
the 19 set..  It was a long time ago..
My 28 perforator unit now is only 60 milliamps, same paper but different
machine I  guess..  I just dont recall using anything more than around 150
volts DC at 60 milliamps.. Always just used a 110 to 110 transformer,
simple rectifier and cap and a large resistor for current regulation to 60
ma...

I dont know more than that...  Skip

Skip MacAulay
VE6BGT

On Sat, Aug 12, 2023, 10:48 PM Jim Cooper, <jim.w2jc at gmail.com> wrote:

> On 12 Aug 2023 at 22:23, Skip Macaulay 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 ... did you have a perforator
> on your Model 19?   the perf magnet
> needs to SLAM the pins thru the paper
> tape, and it takes a lot more than 60 mA
> to do that !!     Have you ever seen the
> REC-29 power supply that went under
> (inside) the Model 19 table?
>
> w2jc
>
>
>
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