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In that case, do you think something like this could work?
http://www.botkin.org/dale/rs232_interface.htm
Basically i'm communicating with and powering a TTL device.
That's great, thank you! :D
I read something about this - darlington pair setup, correct?
Out of interest, could a voltage divider be used to bring the RTS voltage down and then the darlington method to up the current to power the circuit without risk of damaging the serial device?
got it in one. they can and currently do share the same ground.
originally i wanted to power the 3-5v circuit from the serial device itself but not knowing how much draw it could handle, i've opted for a external power source.
Hi, sorry if this is a stupidly basic question but i'd like to be able to switch on a 3-5v circuit using the ~15v RTS signal of a serial device. I gather I can use an NPN transistor for this but i'm a little confused about the resistors i may or may not need.
The serial device is quite...
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