$20 LCR ESR Transistor checker project

[flywheelz]

dont you have anything in the junk pile with an led?
smd would be nice - it wouldnt be sticking up so much.
i do like smd led's

I probably do but the first LEDs I saw staring at me that I could borrow was from the top board of B3606 that I blew up a week ago.  I plan to fix it too, waiting for parts.

I can not believe how hard it was to clean out the holes for donor LED to fit  .  I think I would rather do smd over through hole any day of the week.

Anyways, once LED was in place the encoder button started working! 

I want to thank everyone from the bottom of my heart that helped me with this ordeal, my first DIY kit.      And especially those that starred this project and keep on improving it. 

Check this out!  You can welcome me to the transistor tester family now, finally. 

[stj]

i hope you intend to put those protection diodes back! 

[flywheelz]

i hope you intend to put those protection diodes back! 

I still have the AK1521 suppressor that I will put back but the the little 6 legged bastard that was the cause of all this ran off somewhere.

[mpavlov]

Does any one have the schematic of this version 
 http://www.ebay.com/itm/331873741389?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I received the kit but the seller did not provide schematic, BOM or instruction how to build it 

[mpavlov]

I received the schematic from the seller of the kit the problem is solved  !

[vinceroger]

Does any one have the schematic of this version 
 http://www.ebay.com/itm/331873741389?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I received the kit but the seller did not provide schematic, BOM or instruction how to build it 

Thanks to stj for his help heres the list i used
r1 - 680r sensing circuit
r2 - 470k sensing circuit
r3 - 680r sensing circuit
r4 - 470k sensing circuit
r5 - 680r sensing circuit
r6 - 470k sensing circuit
r7 - 10k reset pullup
r8 - 33k power control
r9 - 3k3 power control
r10 - 27k
r11 - 100k (says r1 but is next to r10)
r12 - 10k voltage divider for battery sense
r13 - 3k3 voltage divider for battery sense
r14 - 560r display related - led current limit
r15 - 27k
r16 - 0r jumper for AVCC
r17 - 2k2 from tl431 to vcc
r18 - 1k rotary encoder current limit
r19 - 1k rotary encoder current limit
r20 - 10k rotary encoder pullup
r21 - 10k rotary encoder pullup
r22 - 470r frequency input dropper
r23 - 10k frequency input voltage divider
r24 - 10k frequency input voltage divider

rv1 - 10k preset frequency input voltage divider

u3 = tl431

q1 - 4673 (bc557c)
q2 - c945 (bc547)
q3 - c945 (bc547)

c1 - 22pf for crystal
c2 - 22pf for crystal
c3 - 100nf
c4 - 10nf
c5 - 100uf 25v
c6 - 100uf 25v
c7 - 100nf
c8 - 100nf
c9 - 100nf frequency input DC blocker

[flywheelz]

In case anyone else gets this Color TFT kit from http://www.aliexpress.com/item/2016-DIY-kits-TFT-LCD-M328-Transistor-Tester-LCR-Diode-Capacitance-ESR-voltage-meter-PWM-Square/32649811953.html?spm=2114.13010608.0.93.7jYDZE

The seller sent me the schematic, parts list and instruction in English.  I have attached them to this post: #2405

Reading the instruction, it says the Transient Voltage Suppressors?TVS? P6KE6V8 has no polarity and can be soldered either way.  The component I've received has no markings.

As for SRV05-4 6-pin diodes array, if you can't read the markings, you will able to identify pin numbering using DMV diode test mode.  Put black lead on middle pin and red on any other pin except the other middle pin and you should see 1.413 Fv drop.  If correct, then black lead is pin #2 and pin #1 to the left of it.  If you didn't get 1.413 Fv drop, then the black lead is pin #5.  Across from #5 is #2 and #1 to the right it. 

The instruction say you could leave out the three SMD components if too hard to solder  .

The kit PCB is of high quality.  All the components worked.  Only negative is the P6KE6V8 has no markings and SRV05-05 has barely partial marking, if you put this on wrong, unit will not work and 9012 transistor will get hot when button pressed in, credit: stj.

[mpavlov]

Next problem where I can find the last firmware for the EZM328(GM328R)transistor tester kit ? 

[vinceroger]

Next problem where I can find the last firmware for the EZM328(GM328R)transistor tester kit ? 

The one that worked on mine is what stj did for me.

EDIT! see below message i posted a wrong link sorry

[stj]

no that's the buggy one - look back a page or 2 for the v2

[vinceroger]

no that's the buggy one - look back a page or 2 for the v2

[flywheelz]

dont you have anything in the junk pile with an led?
smd would be nice - it wouldnt be sticking up so much.
i do like smd led's

I took up the challenge! 

[bitseeker]

Nicely done, flywheelz.

[stj]

not bad.

btw, did you notice the display needs a couple of thick plastic / paper washers under it to make it sit level on the posts!

[flywheelz]

not bad.

btw, did you notice the display needs a couple of thick plastic / paper washers under it to make it sit level on the posts!

Not sure what you mean   

To me both pcb are parallel.

[stj]

maybe that kit has different headers or spacers from the one here.

btw, what the hell is the microswitch for?

[flywheelz]

btw, what the hell is the microswitch for?

 

I found the encoder push button a bit to stiff hence the microswitch.  Yah its bodge job with hot snott but I like it.  Next I would like to install 3 pin header somewhere so I can hook up test clips.

Its not that there is something wrong with the encoder, its because of muscular dystrophy disability that is causing me to lose strength over time.  I have come to love microswitches 

[stj]

put a knob on the encoder.

as for the 3pin socket, get a .1" (2.54mm) 3 pin right-angle socket, and just solder it to the pins of the main socket under the board.

[stj]

oh yes, get yourself a 16MHz crystal - the AY-AT tester is a slow bastard - it needs a boost

[madires]

BTW, has anyone tried the m-firmware with a 20MHz crystal? I'm curious about any feedback.

[Quarlo Klobrigney]

So, in the definitive, can the signal generator - freq counter version as seen in the 2nd picture below, (described as a color kit, but is not) use whatever LCD is in the real color tester as shown in the 1st picture, TC1? The TC1 has no rotaly encoder but can test Zener diodes up to 30V. (Like that's a real Textool socket!)
If so, what would be the color LCD part number to be retrofit the 2nd unit, or is there a unit that has a color LCD that I don't know about, that has ALL of the features of both? Secondly is the software able to be used to update either (I guess all 3 versions, bastardized included).
So i.e (e.g.) which one with the most bang for the buck.

[stj]

you dont know what your talking about.
the kit IS a real colour lcd.

if you mean muliple-colours at the same time - it's just a software difference.
the built unit is probably using custom firmware based on Madires firmware because it can test IR remotes.
the zener tester high-voltage circuit has been around for a pretty long time but not fitted to most boards for safety.
50v+ on an exposed pcb is legally asking for trouble!

[Quarlo Klobrigney]

"you dont know what your talking about." 
Yes I do. But that's one of us....

"the kit IS a real colour lcd."
I thought that #2 was a monochrome LCD with a dark background and yellow text.

There are others I see with just the green or blue backlit screen with boring black text.
Hence the confusion.
So I ask will the #2 unit be able to display as the #1 unit in multiple colors and the same format? And can the #1 photo be adapted to include the rotary encoder, or is that software prohibitive?

[roli_bark]

BTW, has anyone tried the m-firmware with a 20MHz crystal? I'm curious about any feedback.

Is there a config parameter in the m-firmware that sets the frequency ?

[madires]

For 1.24m you just need to set FREQ in the Makefile. And you should have a 20MHz crystal