[GreenKeys] Newbie setting up an m26

[Jomar Quilatan]

Thanks everyone for your input so far!  Yes, I had a hunch it had to do
with some parameter of the magnet - so it was high inductance.

Before I consider getting my hands on a bench power supply capable of
120VDC (my first go-to guess), are there any recommendations of potentially
cheaper solutions?  I have reached out to Paul to see if any 152950s are
still kicking around.

After that I assume it’s just a quick series connection between the power
supply, the resistor and the machine’s connectors? Obviously prior to any
relays and comm connectivity.

Regards,

Jomar


On Mon, Feb 5, 2024 at 2:28 PM Harold Hallikainen via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Welcome to heavy metal RTTY!
>
> As others have pointed out, due to the high inductance of selector
> magnets, a high voltage supply is needed (it is possible to capture the
> "kickback voltage" from the selector magnet and use it on the next space
> to mark transition, though is is more complex). I use a Teletype 152950
> supply from RTTY electronics as shown at https://w6iwi.org/rtty/ .
>
> On interfacing the high voltage loop to a microcontroller, I use an SSR as
> shown in https://w6iwi.org/rtty/DspTU2/kicadA/DspTuShemA.pdf (see K1).
>
> Good luck!
>
> Harold
> https://w6iwi.org/rtty
>
>
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