Products > Test Equipment
TC1 lcr-meter transistor-tester fix
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acerquax:
 :-+
madires:
That one needs a firmware update for U4 (https://github.com/atar-axis/tc1-u4) or a simple two-transistor circuit which replaces U4 (https://github.com/madires/Transistortester-Warehouse/blob/master/Hardware/TC1-Mod.pdf).
acerquax:

--- Quote from: madires on October 09, 2023, 07:42:39 pm ---That one needs a firmware update for U4 (https://github.com/atar-axis/tc1-u4) or a simple two-transistor circuit which replaces U4 (https://github.com/madires/Transistortester-Warehouse/blob/master/Hardware/TC1-Mod.pdf).

--- End quote ---

Thx mate..!
but
No flashing possible.....FTDI USB/UART connected,
started stc-isp6,
adjusted 12MHz ,
opened code file U4.hex--->
Download program.....>>> ..checking target MCU.................... :-// nothing more!  :-BROKE
indman:
acerquax, It is not necessary to reprogram U4, remove it from the board and save it to be able to return the factory Chinese firmware. Instead of U4 build a very simple circuit on 2 transistors, which madires suggested. It works much better and more reliably than the U4.
madires:
... and the quiescent current is much lower.
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