Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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F1RVC:
That is my first thought too, but  what is the link between both of them? If a problem would have been occured on PA4 (static or capacitor  discharge, etc...) why PA3 is down too ?

madires:
I can only speculate. An over-voltage could also damage neighboring IO cells on the MCU die.

distefanom:
I would ask anyone who has the circuit made using a couple of transistors, to replace U4 so allowing me to use the free firmware kindly available here.
Since I don't have kikad on my PC, I would like if anybody could make me a screenshot of the complete circuit (I don't need the PCB layout) so I could replicate it on a bareboard.
Thanks to anybody who can help.
Mario

madires:
Please see https://github.com/madires/Transistortester-Warehouse/blob/master/Hardware/TC1-Mod.pdf!

chris2u:
I just bought a TC1 recently....Generally all seems good....Although the micro USB connector was too far recessed for the cable to reach properly!....And don't expect the PCB to sit right down on it's supports..Probably due to the display being mounted too far off the circuit board, or maybe the supports are in the wrong place..

The zener test voltage is 23.1V (Not over 30v as other units are) and am wondering if this is normal for this model ??
This unit does not have the largish high voltage transformer but has 2 small inductors in the power supply section.

Attached is a photo of the PCB.

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