Posted By
SukkoPera
on 2023-03-23
06:22:51
|  Re: Covox Speech Thing - parallel port adapter
Well, just use thicker wire  .
I might have a PCB design that would work for you. It was designed for connecting printers to (the next revision of) my 16UP board (or the Userport of a standard +4) but as we have seen, it should work in your case too. Problem is I haven't got it manufactured yet, so I can send you the gerbers if you are willing to get them made yourself.
I can also try to squeeze in an (optional?) IC that turns open-collector outputs to push-pull ones but that would take some time.
(UNRELATED) UPDATE:
I've been looking at finding reasonably-priced x/2x resistors of a suitable value for building a Covox clone and it looks like the following is currently the best combo:
- 100x MFR-25FTE52-11K (11k 1%) = 2.80€
- 100x MFR-25FTE52-22K (22k 1%) = 2.80€
These also have good temperature stability, for those who are really paranoid ;).
Of course we can just pick any value and use 2 resistors in parallel for getting half the resistance, but a board like this would already have quite a lot of resistors to solder, so I'm sure we'll be happier if we can avoid that... :)
(This is mostly a note to my future self, when I'll pick this project up ;) )
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