Article AVR Transistortester on mikrocontroller.net
I've read through the English part of that page a couple of times, thanks.
I am astonished at the history of this project and how different clones have evolved along with the software and fork versions. This was my basis for saying "this needs a wiki." The project is wonderful in it's current configuration/context but the details and evolution of the project deserve their own acknowledgement, in my opinion. A lot of work went into this project to get to it's current iteration. I believe this work should be noticed by everyone not just the few people that have been here all along or the few that read this entire thread history (just a small part of the total project). Also the casual hobbyist or newly interested young kid that grabs an old device off the shelf should be able to understand where their device falls into the mix and what it's capable of. I imagine someone that has an old clone from 2013-2014 has a hard time figuring out what they have and what it is/is not capable of. This thread has lots of older versions I've never seen before.
The SRV05-4 is "passive" and doesn't need any supply voltage.
When a DUT capacitor with a charge is connected, and the test points are connected to a SRV05-4 what exactly causes the failure? Is it simply the potential across the test pins without the completed Vcc to GND loop? I'm mostly confused because of how KH words the warning on the pdf:
... The Tester may be damaged before you have switched it on. There is only a little protection at the ATmega ports.
Does the same damage occur regardless of whether the device is on or off?
...there's aleady a discharge/protection relay add-on.
I read somewhere recently (sorry haven't found the ref), there is a problem, as the circuit is documented. The current draw of the transistor/relay combined with the gain of any BJT transistor pulled too much current. They had mentioned the problem was due to the relay connection at the Vref point. Maybe that person was wrong, I don't know, but the maths looked right to my amateur understanding.
Have you seen Karl-Heinz' excellent documentation yet?
Yes, thanks, I've read through everything but the programming section of version 1.13K. I can't promise that I remember every detail but I have read it.
I'd recommend to add a second 5V LDO
I preferred a 5V micro switching module.
It can deliver much more current and can be used for:
- servo test (with the m-firmware)
- bluetooth module (enabling the serial output on the k-firmware)
- Zener test (as the input for the boost converter)
I added also a switch to save battery power if this secondary voltage is not in use.
I would add the 3 pin standard header for the servo test and a connector for the serial output (PC3 on the k-firmware).
Mauro
*sees Bluetooth serial connection//looks though official pdf document again//head explodes*
You should show that little Bluetooth module mod on your YouTube channel. I'd like to see more about that.
Why would you run 2 linear regulators? Are you guys implying the use of the DC converter to power the transistor tester itself, or am I misunderstanding something else?
When it comes to what I'm doing with the schematic, my goal is to seamlessly integrate this clone version with the current pdf documentation. Ideally I would like to create a final schematic that mirrors figure 2.1 on page 10 of the pdf documentation exactly. I want to fade an image from the KH-original to my clone version seamlessly. This will allow anyone that reads section 2.1 and several other sections, to seamlessly connect what they read to the clone schematic without the need to translate or figure out the differences on their own.
Every part number will need to match the clone, and every location should should match the schematic while clearly showing the additional parts of the clone's circuit and all designators.
Sorry I have so many questions, hopefully that doesn't offend anyone.
Thanks for all the help and support,
-Jake.