[GreenKeys] off the shelf power supply for model 28 loop supply

[Virgil Bierschwale]

Thanks
I have a Hal ct-2200
Not sure if it works
But the manual says it doesn’t have a loop supply

I just bought one of his boards

What I want to do is have a arduino or raspberry send txt messages to the
model 28 for alarms on solar and aquaponics when an error occurs

Maybe the simplest way is to wait for a Hal st-6 to show up on eBay?

Or something along those lines?

On Fri, Sep 6, 2019 at 6:23 PM Paul Heller <paul0926 at comcast.net> wrote:

> Virgil,
>
> it depends on what you want to do. If you want to only use Jordan’s board,
> you only need a loop supply. The problem with many dedicated power supplies
> is having sufficient range to set the voltage and current to the levels you
> need. 5 volts is not enough. Most loop supplies are 130VDC and supply 60ma,
> so if you can find a variable supply that gets up into those ranges you
> will be ok. People have occassionally posted here different supplies they
> have found only that work well for them.
>
> If you want to do more, like hook it to ITTY, you will want a TU (which
> has a built in loop supply). They come up often on eBay or someone on this
> group might have a spare lying around.
>
> TUs vary from black boxes to ones with lights to ones with scopes. Blinken
> lights are always fun.
>
> Paul
>
> On Sep 6, 2019, at 5:07 PM, Virgil Bierschwale <vbiersch at gmail.com> wrote:
>
> I'm finally starting to think about hooking up my teletype.
> I don't think I have the skills to build a loop supply.
>
> Can I buy something like a 1 amp dc power supply from somebody like astron
> and use that?
>
>
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