That’s a good idea, I will try that
From: Mattis Lind
Sent: Tuesday, May 2, 2023 7:55 AM
To: r...@jarratt.me.uk; General Discussion: On-Topic and Off-Topic Posts
Cc: Rob Jarratt
Subject: Re: [cctalk] Re: Rainbow H7842 PSU Fault
Not quite sure what you mean here. I had advice f
Hi everyone!
I'm working on a project where I need to build an RS-232 to Current
Loop adapter. I've seen some schematics on-line and the parts list
seems pretty small, but does anyone have a specific set of
instructions and schematics that they trust? Or does anyone in the UK
have a spare adapter
It seems surprisingly hard to find that, though this
https://forum.vcfed.org/index.php?threads/rs-232-to-current-loop-interface.47841/
is close.
Conceptually it's really easy. The main tricky part, certainly if you're
driving a mechanical terminal like a Teletype, is the current source. You
On Tue, May 2, 2023 at 1:34 PM Paul Koning via cctalk
wrote:
>
> It seems surprisingly hard to find that, though this
> https://forum.vcfed.org/index.php?threads/rs-232-to-current-loop-interface.47841/
> is close.
>
> Conceptually it's really easy. The main tricky part, certainly if you're
> d
Led Driver ICs may merit consideration, e.g.
https://uk.rs-online.com/web/p/led-driver-ics/7377975 for 20 mA. However, they
usu have a not insignificant voltage drop (a few Volts). I have used lots of
10 mA versions for sensing switch / relay closures, typically with an ACPL-217
as sense elem
If it’s specifically to interface to a model 33 Teletype, here’s a design that
works well and is pretty simple.
https://altairclone.com/teletype.html
Mike
