gnupic: 555 code dumper testing (was DIY USB programmer?)
Subject:
Re: 555 code dumper testing (was DIY USB programmer?)
From:
Laurence Withers ####@####.####
Date:
21 Jan 2005 09:19:51 +0000
Message-Id: <200501210919.51005.lwithers@users.sf.net>
On Friday 21 January 2005 00:15, Byron A Jeff wrote:
> I finally have a schematic for folks to examine and comment upon:
>
> http://www.finitesite.com/d3jsys/tbs555
>
> Any comments welcome. Be aware that the RX circuit in the top right
> corner hasn't been wired or tested.
>
> Also there's no software yet. Alain and I are working together to see
> if we can get a pkp that will drive it.
>
> Note that I didn't address the Vpp/Vcc issue. It's something that
> will need some further discussion.
Hi Byron,
Wouldn't it be sensible to use a MAX-232? (note I didn't follow this
discussion in great detail, so sorry if I missed some reasoning against
it). Not only does it take care of the RS232 level conversion, you
could also use the +12V charge pump which might well supply enough
current for HVP.
In terms of pricing/availability, at least in the UK, Rapid Electronics
(http://www.rapidelectronics.co.uk/) sell the MAX-232 for UKP1.35; they
also accept credit card orders with no minimum charge so that's quite
useful for the hobbyists among us.
Bye for now,
--
Laurence Withers, ####@####.#### ####@####.####
http://www.personal.rdg.ac.uk/~sis04lw/
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