[GreenKeys] Newbie setting up an m26

[Jomar Quilatan]

In reply to my location (Sorry for the delay on this reply), I'm in the
Toronto area in Canada - replying to the list in case anyone may also be
from relatively nearby!

- Jomar

On Mon, Feb 5, 2024 at 8:30 PM Jeffrey Golas <jeffg at junknet.net> wrote:

> Where are you located? Maybe someone local to you can help.
>
> You can actually use a 12v power supply in the short term as long as you
> use a resistor and dial it in to the right current. For short distance
> stuff that could work.
>
> You can build a 120vdc power supply using a simple "isolation"
> transformer..theyre often used in arcade games/coin op stuff and are
> basically 120v in and out, but the output it much safer (but still
> dangerous 120v). Then just connect a bridge rectifier for dc and add a high
> wattage resistor or rheostsat for adjusting current. These things were
> simple, not highly regulated, and low current.
>
> Jeff
>
>
>
> On Feb 5, 2024, at 7:51 PM, Jomar Quilatan <jomarquilatan at gmail.com>
> wrote:
>
> 
> 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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>
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>
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