I guess I've been lucky as I use a half-dozen or so of various TTL-RS232 converters and haven't had any problems; something to be aware of though, thanks!
On Wed, May 19, 2021 at 8:35 AM Stephen Adolph <twospru...@gmail.com> wrote: > yep that is what happens. I was really questioning myself until I > realized these parts are garbage. > > On Wed, May 19, 2021 at 8:28 AM ExPLIT | Pawel Radomychelski < > exp...@mailbox.org> wrote: > >> I bought 5 of this MAX232ACPE from China on eBay for my Max 8085 Project. >> 3 of 5 was getting very hot and "have burned" somehow. >> >> I took an old TI MAX232N and anything was fine. >> >> -- >> >> Kind regards / >> Mit freundlichen Grüßen >> >> ExPLIT IT Solutions >> Pawel Radomychelski >> >> >> >> -----Original Message----- >> *From*: Stephen Adolph <twospru...@gmail.com >> <stephen%20adolph%20%3ctwospru...@gmail.com%3e>> >> *Reply-To*: m...@bitchin100.com >> *To*: m...@bitchin100.com >> *Subject*: [M100] Fake MAX3232 RS-232 transceivers from China / Ebay >> *Date*: Wed, 19 May 2021 07:34:21 -0400 >> >> As you know I tend to tinker with hardware a lot. >> Well I certainly have been schooled on the downside of cheap ebay parts. >> >> I'm working on a project to make Newdos (aka TS-DOS) more tolerant of >> network latency. After all, we have good solutions now possible for direct >> serial over wifi, so what we need is a TS-DOS that can chat over real IP >> networks. >> >> To conduct some experiments and observe what is going on, I've made 2 >> RS-232 inline devices. >> >> RS-232<----> MAX2323 <---> MAX3232 <---> RS-232 >> One is simply a repeater; It sits on an RS-232 link and has 2 back-to >> back MAX3232 transceivers such that I can easily see the signals >> represented as 3V logic (compatible with my logic analyser). >> >> RS-232<----> MAX2323 <---|-----|-> MAX3232 <---> RS-232 >> | | >> MAX3232 >> | | >> M100 >> The second device is the same repeater that also includes a connection on >> one data line to an in-line M100. This allows the M100 to be a "man in the >> middle" and buffer up/ delay the RS-232 characters in one direction. This >> simulates wide-area network latency. >> >> The "delay" program is attached. >> >> Anyhow, a lot of MAX3232. Well I bought 10 of what I thought were actual >> MAX3232 from ebay. Example here: >> >> https://www.ebay.ca/itm/273089898048?hash=item3f956d2640:g:PBkAAOSw03lY42ZH >> >> Well, my projects were being frustrated by what I thought were defective >> boards.. in fact... read this --> >> >> >> https://blog.heypete.com/2016/09/11/investigating-fake-max3232-ttl-to-rs-232-chips/ >> >> What a hassle. Long story short - ST3232 is a reasonably priced pin >> compatible replacement for MAX3232 that you can get at digikey. >> Cost me 25$ to get 10 parts, but ... I would have had several hours back >> in my life had I avoided the ebay supply route. >> >> Just goes to show you gotta be careful! >> >>
