The trend is for newer/faster/larger/cheaper MCU chips to operate only at 3.3V (although some can accept 5V logic signals as inputs on selected pins) To review: Since the Transistor Tester generates its test signals directly from MCU GPIO pins this means the MCU must be able to output a full 5V from its GPIO pins. There simply aren't many alternatives to the Atmel/Microchip AVR family. My thoughts about selecting MCU chips for scratch-built DIY Transistor Testers and also for upgrading/customizing "factory built" Transistor Testers: The OSHW Transistor Tester requires the MCU to have GPIO ports which fully support 5V logic levels for both input and output. Zener test feature implemented (up to 50V, test current ~5-10mA) More info about DIY Transistor Testers: (Check this post periodically - I will add links as I find them) First take a look at this post by Madires (attached photo is Madires ATmega644/1284 development board): $20-transistor-tester-enclosures-and-mods/msg1201483/#msg1201483 $20-lcr-esr-transistor-checker-project/msg3578117/#msg3578117 $20-lcr-esr-transistor-checker-project/msg4637764/?topicseen#msg4637764 $20-lcr-esr-transistor-checker-project/msg825537/#msg825537.High-quality rotary encoder with large knob for user input.Full protection for the 3 probe pins (SRV05-4, P6KE6V8A, plus a relay).Bootloader for firmware updates through USB serial port.USB port supplying power and providing serial connection to host PC. Constructed on “perma-proto” style board.IL9341 or similar large color LCD display (I want a larger display than ready-made units).Alternately the board could support a micro SD card for storing several different firmware versions I read that a "dual boot" setup where the user can select between one k- version and one m- version might be feasible. Enabling all optional features of current OSHW Transistor Tester software does require a 64k MCU (such as ATmega644). I have ATmega644 and ATmega1284 MCU chips in 40-pin DIP packages.I'm starting construction on a scratch-built DIY Transistor Tester "development system:"
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