I'm using a transistor to invert the output of a UART Tx signal. When I view the inverted data on a logic analyzer, there isn't any data since the output signal is constantly at zero volts. This seems like something that shouldn't be a problem. I changed the transistor to a different, equivalent one since I was wondering if the transistor had a problem. It didn't. I also verified that there was data being sent on the UART Tx signal and there is. The logic analyzer will read that data (inverted from the way I want it of course). I also used a hex inverter (74HC04) to invert the signal and it worked great, but it isn't exactly what I need. I'm not sure what to try next to get the transistor to work. Any ideas??
I've tried to insert a schematic as well as attach an image of it. Any help would be appreciated. Thanks!
What are the values of the resistors in your schematic? Also, your schematic lists the NTE490, which is an N-channel MOSFET transistor that needs 10V at its gate to turn on (i.e., it is not "logic-level"). However, the schematic shows the symbol for an NPN-type BJT transistor. You have to resolve that before debugging anything else. Your schematic should work with an NPN-type transistor like a 2N3904 or 2N2222 or 2N4401. Do you have any of those to try?
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CrossRoads,
I'm using 1k ohm resistors throughout.
RuggedCircuits,
I don't have any of the transistors that you suggest, but tonight I'll purchase a couple to try out...many thanks for your input! I'll let you know how it goes.
I changed the transistor to a different, equivalent one since I was wondering if the transistor had a problem. It didn't. I also verified that there was data being sent on the UART Tx signal and there is. The logic analyzer will read that data (inverted from the way I want it of course). I also used a hex inverter (74HC04) to invert the signal and it worked great, but it isn't exactly what I need. I'm not sure what to try next to get the transistor to work. Any ideas??
