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 < [email protected]> 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 <[email protected] > <stephen%20adolph%20%[email protected]%3e>> > *Reply-To*: [email protected] > *To*: [email protected] > *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! > >
