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Bang good transtor tester DIY M12864 build

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PekkaNF:
On Rob Wilson's thread "Re: Digital oscilloscope project/kit "#18 is a nifty transistor tester he build from kit.
http://madmodder.net/index.php/topic,11145.msg130205.html#msg130205

I had to have one too.
http://eu.banggood.com/Wholesale-Warehouse-DIY-M12864-Graphics-Version-Transistor-Tester-Kit-LCR-ESR-PWM-wp-Uk-986954.html

It arrived two days ago and I build it yesterday. Was easy eneough and it works. Kit was good, but there were few things that annoys me. I could not find a parts list. References between circuit diagram and PCB were non existent. Felt really weird to "weld" componen on the PCB on silkscreen reference of the value. Makes troubleshootting bit hard if it were more complicated and more layers.

Really wished the insructions were better in structure. Engrish was parts funny, parts incomprahensive. That extended on user interface. E.G. function generator frequency mHz?

Anyway, seems to work reasonably good.

I'm at that point, where I think should I:
* Leave it as it is
* Make an enclosure and use it as a tranistor tester.
* Improve it a little and then make an different enclosure.


Few things got me curious, I hope I could get some answers.


1) How well this processor is protected on ESD and other cuties? All pins are pretty much connected without any ESD or OV proections straight to the processor. I could solder a subboard with TVS or such over auxiliary test point exits. Probably this would have some impact on capasitance range on lower end but I doubt.

2) Any thought about using and adaper to power it insted of battery. Specially if used as a function generator.

3) How usefull freguency counter input is? Incidently I did not recognize where that TP is connected on Atmega.

4) How useful function generator output is? It is not buffered or protected. But there are may ocassions a siple TTL signal is that is needed.

Thank you,
Pekka

John Stevenson:
That kit is £14.91 in UK pounds
I just bought one from China for £9.67 with £0.33 pence postage so say £10 total and that was ready built and worked out the box.

http://www.ebay.co.uk/itm/201493269992?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I thought kits were supposed to be cheaper ?

Brass_Machine:
The extra cost is for learning how to Solder (weld?) John.

Seriously though, I have been soldering for a long time, but have not done much SMD soldering. How are you guys doing it?

Joules:
Quickly

PekkaNF:

--- Quote from: John Stevenson on January 16, 2016, 06:42:25 AM ---....
I thought kits were supposed to be cheaper ?

--- End quote ---
Yheah, but yours is like spotify - you have endure the special "F-generator"...I would get tired on Gordon Ramsey.


--- Quote from: Brass_Machine on January 16, 2016, 10:09:43 AM ---Seriously though, I have been soldering for a long time, but have not done much SMD soldering. How are you guys doing it?

--- End quote ---
SMD flux, 60w iron and still I avoid soldering it.

But seriously. Any ideas about the original questions?

Thanks,
Pekka

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