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TC1 lcr-meter transistor-tester fix

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galaga1982:
Hi,

As you said, a simple circuit for thyristor test was constructed. The LED turns on when you close the gate and anode as shown in the picture. And even when opened, my 5P4M thyristor seems to be normal as it remains on.

By the way, why is thyristor not accurately marked on the LCR meter as shown in the picture? I'm using LCR-TC1 2.12K FIRMWARE, and this wrong information was the same for other types of monochrome LCR meters. It would be very appreciated if madires, indman or anyone else could answer this symptom.  :)

Regards,

indman:
galaga1982, The tester can test parts with a voltage of maximum 5V and a maximum current of only 5-7mA. This is stated in the author's instructions. For your 5P4M Gate-trigger Current(Igt) is 10mA, so the tester cannot create it and reliably open the thyristor. Therefore, thyristors and other parts that require higher voltage and current cannot be detected correctly. We must always remember this! ;)

madires:
The 5P4M has a maximum trigger current of 10 mA and a typical holding current of 10 mA. That's is bit more than the tester can provide.

gmc:
Purchased a TC1 from Alix and also received a blue version with U1. The numbers on the chip have been erased but guessing its a LGT8F328

Attaching a photo for reference.

Is there any firmware dump for this version?

madires:
Yes, the MCU's pinout matches a QFP48L LGT8F328. So far I haven't seen any firmware dump for that one.

BTW, jm_araujo replaced the LGT8F328 of his T7 with an ATmega328: https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg5518618/#msg5518618

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