[GreenKeys] UPDATE- shockingly basic question - Teletype Model 33 ASR

[Nick England]

*Across* the resistor???? Do you mean scope probe to one side and ground
clip to the other?

Careful! If part of the loop is grounded, and you hook up the scope ground
to the wrong spot, you can short out the power supply. Sparks sparking!
Fuses fusing! Transistors blowing quickly to protect the fuse!

I am a M33 ignoramous, but isn’t there a selector magnet driver? That’s
where Russ was talking about ripple, not a signal loop.

I could be reading this all wrong.
Nick

On Thu, Feb 11, 2021 at 11:55 AM Jim Cooper <jim.w2jc at gmail.com> wrote:

> On 11 Feb 2021 at 11:20, Andy KN4UCL wrote:
>
> > *Well that makes sense. Looking at
> > my ring binder (Tech bulletin 310B
> > Vol2) I have a power supply circuit
> > diagram, but I am not sure where I
> > would physically plug in my highly
> > underused budget Hantek scope...*
>
> If your scope can handle the voltage,
> one simple place to put the scope is
> across the current limiting resistor
> in the loop (usually about a 2k resistor).
>
> You will then see the square pattern of
> the character code.
>
> w2jc
>
>
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-- 
Nick England K4NYW
www.navy-radio.com
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