Author Topic: $20 LCR ESR Transistor checker project (Read 3447355 times)

Azure · « **Reply #4950 on:** July 28, 2018, 08:29:13 am »

Quote from: rddube on July 27, 2018, 12:04:11 am

For any of you thinking you can test capacitors in circuit, the answer is yes and no.

Just to be clear they are ESR meters. Their component tester is not recommended or able to reliably detect in circuit components and it does not tolerate charged capacitors.

MattP79 · « **Reply #4951 on:** July 29, 2018, 02:30:15 pm »

Forgive my ignorance, I'm a little

by the options available to me. I have one of the AY-AT clones running software version 1.12K which I'd like to update. Having looked at the options for programming an ATMega328 chip, on AliExpress I've found this: ATMEGA16 ATmega32 Board + USBISP 3.3V / 5V AVR Download Programmer New with identical options available on eBay et al... Is this a sensible option for someone who has limited experience with such devices? Would an Arduino Uno R3, which is a similar cost, be a better option? Money is limited hence looking at these limited options.

Many thanks in advance

madires · « **Reply #4952 on:** July 29, 2018, 02:56:28 pm »

A simple ISP programmer for 2 bucks is sufficient, and a search for "AVR programmer" will list tons of those. You might need to build an adapter from 10 pin to 6 pin if the programmer doesn't include one.

timelessbeing · « **Reply #4953 on:** July 29, 2018, 07:22:28 pm »

Quote from: MattP79 on July 29, 2018, 02:30:15 pm

I have one of the AY-AT clones running software version 1.12K which I'd like to update.

https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg810893/#msg810893

MattP79 · « **Reply #4954 on:** July 29, 2018, 08:16:40 pm »

Thanks

So - yes - exactly that.

I am reading the thread from page 1 but hadn't make it that far yet. Who'd have kids who need almost constant attention?

bitseeker · « **Reply #4955 on:** July 31, 2018, 02:27:53 am »

Kudos for attempting to read the entire thread from the beginning. You are one of the few willing to be so diligent. Many don't make it further than a page or two when starting from the end of the thread.

timelessbeing · « **Reply #4956 on:** July 31, 2018, 05:11:20 am »

Quote from: bitseeker on July 31, 2018, 02:27:53 am

Many don't make it further than a page or two

Most don't even bother trying that.

MattP79 · « **Reply #4957 on:** August 03, 2018, 09:20:37 pm »

Thanks for the thread! Finally read myself back to this page and now I'm a little lost what to do. Like when you finish binge watching a good TV series.

bitseeker · « **Reply #4958 on:** August 03, 2018, 09:49:32 pm »

Buy an inexpensive Uno and some 328 ICs. Use the Uno to program the firmware you want onto the new ICs. Then, swap the 328 chips. If something goes wrong, you don't like the new firmware, or you want to compare behaviors, just put back the original 328 containing version 1.12k.

timelessbeing · « **Reply #4959 on:** August 04, 2018, 04:22:52 am »

Quote from: MattP79 on August 03, 2018, 09:20:37 pm

I'm a little lost what to do.

Well, it's component tester. You buy it, and then you measure components with it. If you're feeling saucy, you update the program (there are two flavours). If that doesn't help, then you'll have to be more specific.

bitseeker · « **Reply #4960 on:** August 04, 2018, 04:26:38 am »

You can see Matt's original question in this post: https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg1708790/#msg1708790

timelessbeing · « **Reply #4961 on:** August 04, 2018, 05:48:57 am »

The question was answered. He was given a link to a $2 programmer and flashing instructions.

If some part of that was unclear, then he needs to specify. If he has new questions, he still needs to specify. I don't know about you, but I can't read minds.

Vague · « **Reply #4962 on:** August 05, 2018, 11:40:08 am »

Thank you Madires and HK for all the time and effort that you have put into this project.
Can you use a a 20MHz XTAL with the 1.13k firmware or are you limited to 16MHz?
Than you

madires · « **Reply #4963 on:** August 05, 2018, 02:02:31 pm »

Karl-Heinz has started adding support for 20MHz but I don't know if the current trunk version includes full support already.

Per Hansson · « **Reply #4964 on:** August 05, 2018, 08:19:21 pm »

I've noted that the tester using Karl-Heinz firmware reports a maximum "worst case" ESR of .14K (or 140)
Is this what others see too? (Same behavior on two meters, just curious what others get...)
Also in the attached example a Fluke 28-II can't even get a capacitance reading, yet the value reported is correct for the cap: Lelon REA 100µF 50v
I know the cap is dead because replacing it made the equipment it was in come back to life

indman · « **Reply #4965 on:** August 06, 2018, 07:32:07 am »

Quote from: madires on August 05, 2018, 02:02:31 pm

Karl-Heinz has started adding support for 20MHz but I don't know if the current trunk version includes full support already.

Yes,current trunk version Karl-Heinz includes full support 20Mhz

Quote from: Per Hansson on August 05, 2018, 08:19:21 pm

I've noted that the tester using Karl-Heinz firmware reports a maximum "worst case" ESR of .14K (or 140)

Yes,I have same results.

madires · « **Reply #4966 on:** August 06, 2018, 02:45:13 pm »

Quote from: Per Hansson on August 05, 2018, 08:19:21 pm

Also in the attached example a Fluke 28-II can't even get a capacitance reading, yet the value reported is correct for the cap: Lelon REA 100µF 50v
I know the cap is dead because replacing it made the equipment it was in come back to life

A high Vloss value indicates a leaky cap. Vloss is simply the self-discharge rate and the capacitance measurement is able to compensate this to some extend. So the capacitance can be ok but the resistive part of the cap causes Vloss to increase. Or in other words, the firmware is aware of C and Rp (cap's equivalent circuit).

Per Hansson · « **Reply #4967 on:** August 06, 2018, 04:00:10 pm »

Yes, I was implying that I am quite impressed by what the little meter can do

Can I ask when you wrote this over here, quoted below too, in relation to Mr. Carlsons LV Leakage tester.
How would that be different vs the leakage value in percentage we see now, I do realize you write the M-firmware, and I have the K-firmware.

Quote

"The k-firmware derives a value called V_loss (in %) which indicates the self-discharge rate of an electrolytic cap. The m-firmware does something similar but displays an equivalent leakage current. We could add a leakage check which charges up the capacitor and measures the voltage drop across a current shunt. The lower limit would be a about 2nA (Vcc is 5V). I'll put the idea on my to-do list."

madires · « **Reply #4968 on:** August 06, 2018, 08:12:00 pm »

The current Vloss or I_l values are a side product of the capacitance measurement. The method mentioned in the thread about Mr. Carlson's LV leakage tester would be a another approach allowing to measure the leakage current directly while possibly supporting lower currents.

Per Hansson · « **Reply #4969 on:** August 06, 2018, 09:30:45 pm »

That sounds great, did you do any work on it or the idea is on hold?

kikook · « **Reply #4970 on:** August 07, 2018, 07:30:22 am »

Hi,
Trying to compile the Markus firmware with winavr.
I'm having this error, someone can say me what i'm doing wrong ?
Thanks.

madires · « **Reply #4971 on:** August 07, 2018, 10:28:56 am »

Quote from: Per Hansson on August 06, 2018, 09:30:45 pm

That sounds great, did you do any work on it or the idea is on hold?

It's still on my to-do list. At the moment I'm working on a different project.

madires · « **Reply #4972 on:** August 07, 2018, 10:34:28 am »

Quote from: kikook on August 07, 2018, 07:30:22 am

Trying to compile the Markus firmware with winavr.
I'm having this error, someone can say me what i'm doing wrong ?

I don't use winavr but this seems to be some internal problem. Maybe a bad path?

neslekkim · « **Reply #4973 on:** August 07, 2018, 11:38:36 am »

Looks like 644 based devices starts popping up now: https://www.ebay.com/itm/113001217497

Cliff Matthews · « **Reply #4974 on:** August 07, 2018, 11:46:07 am »

Banggood has this M644 for 24.98 usd https://www.banggood.com/Original-Hiland-M644-Transistor-Tester-LCR-Diode-Transistor-Zener-Quartz-Measurement-p-1279042.html?


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Author Topic: $20 LCR ESR Transistor checker project (Read 3447355 times)

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