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Chip: MAX3232CSE
Rango de voltaje: 3 V ~ 5 V.
Velocidad de baudios más alta: no se recomienda más de 120 kbps
Tamaño: 9,4 mm x 15,9 mm.
Las fuentes de alimentación están conectadas juntas en ambos lados, solo conecta un lado, los dos lados de cada uno de los canales separados se pueden usar, las flechas indican el flujo de señales, las instrucciones se introducen en el interior hacia fuera. La descripción es la salida, el carácter RS232 cerca del extremo del nivel RS232, cerca del final del nivel TTL del carácter
El paquete incluye:
10 módulos mini RS232 a TTL MAX3232
Richard Quaif
Comentado en los Estados Unidos el 15 de marzo de 2024
Some of these overheat. The problem is that they use a substitute MAX3232 chip that is missing an internal pull up on pins 9 and 10. Only half this chip is used on this board and pin 10 is not connected and floating. The result is that the chip can oscillate at a high frequency and overheat. The solution is to add a pull up resistor to V+ on pins 9 and 10. Any value from 20K to 400K will work. As only 1/2 the chip is used you can connect 9 and 10 together and that makes adding the resistor much easier. After the added resistor the boards seem to work fine.
LZ
Comentado en los Estados Unidos el 3 de abril de 2024
Works fine. I was a little leery after reading some reviews, but read enough of them to avoid the potential issues. I'm using it to add 2 serial ports to a Raspberry Pi.Things to keep in mind:1) There are TWO converters, one on each face of the board. There's not enough room on the chip side to label which end is TTL and which is RS232 (did I mention it's tiny?), but it matches the other side which is clearly labeled.2) If you're not using the second converter, don't leave the input floating or it'll overheat. See other reviews for how to add a pullup resistor.3) I had no trouble attaching flexible 28 gauge wire to the small solder pads. I could see if you tried attaching larger or solid wire, or a component directly, it could be dicey.4) Some reviewers complained about mounting it, but it's easy if you attach all 8 wires first. Then connect power using the through-holes (I snipped leads from diodes for this), so the whole thing is suspended over your main PCB. I added a 3rd lead to the other side to secure it better.So don't let the other reviews scare you. It works, and good luck finding anything more compact or cheaper.
q
Comentado en los Estados Unidos el 4 de mayo de 2023
These work well and do not heat up, however, there is a key point that the seller needs to emphasize - these devices provide *two* RS232 (TX, RX) pairs. Each pair is on one side of the PCB - this is the reason for the pads without holes. The other users that talk about drilling through those pads are shorting two different channels and make the channel drivers fight each other, resulting in higher heat dissipation.Note to seller - personally, I would have preferred if the TX/RX pairs used four through-hole pads on each side and the connections to GND and Vcc were on the bottom as pads you solder to. Or, even better, one can extend the PCB by 2.54mm and have two more through-hole pads.
P. Meyer
Comentado en los Estados Unidos el 18 de enero de 2021
Way too much power draw on every one. They get so hot they’ll give you a burn. On each board the + pads are common as are the - pads and none of the pins are shorted.These are so difficult to work with I wouldn’t rate the very well even if they worked.
Customer
Comentado en el Reino Unido el 9 de noviembre de 2019
a little fiderly to conect up, work well have used several.
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