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Thaikit transistor curve tracer help
akabek:
--- Quote from: Calambres on January 24, 2023, 04:51:38 pm ---I kept adding beads untill all artifacts disappeared. Seem to recall about two small beads per wire ::)
--- End quote ---
I will leave the standard wires in and add some ferrite beads. Did you add the beads to the X, Y, E, B and C wires?
Nice setup. Are you able to measure up to 4 transistors at a time? If so how did you wire that up with 1 DUT on the PCB? This may be a silly question but I no experience around the design side.
Calambres:
--- Quote from: akabek on January 24, 2023, 05:22:34 pm ---Did you add the beads to the X, Y, E, B and C wires?
--- End quote ---
Just C,B & E wires.
--- Quote from: akabek on January 24, 2023, 05:22:34 pm ---Are you able to measure up to 4 transistors at a time?
--- End quote ---
Nope, up to 6 transistors :) Ideal for comparing and matching.
--- Quote from: akabek on January 24, 2023, 05:22:34 pm ---If so how did you wire that up with 1 DUT on the PCB? This may be a silly question but I no experience around the design side.
--- End quote ---
With a 7 way switch, selecting sequentially from 0 (no connection) and 1 to 6.
akabek:
The the additional switch is definitely a very handy option.
akabek:
I picked up some ferrite beads and installed two on each C,B,E wire. They also had the CD4024 and TL074CN IC so grab those. After installing the beads, and swapping one IC chip at a time, I still do not see the stepped curve. I also went over all the solder joints with the iron and still no luck.
I have a feeling my issue may be around the signal from the Y channel. I was probing for continuity with the meter and when I check the X channel to ground whether it be on the PCB or the BNC connector there is no continuity. But when I checked the BNC connector and PCB board with the meter I found the Y contact has continuity with the ground contact. Is this correct?
akabek:
Well I feel silly. Changing my wires around I swapped the E and B wires. I now have it working and the traces are more sharp than before with the beads installed.
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