Author Topic: 5 Transistor ESR Meter Design  (Read 196517 times)

0 Members and 2 Guests are viewing this topic.

Offline m3vuv

  • Frequent Contributor
  • **
  • Posts: 797
  • Country: gb
Re: 5 Transistor ESR Meter Design
« Reply #325 on: December 02, 2020, 11:06:49 pm »
can this be used to measure the internal resistance of 18650 cells?.
« Last Edit: December 02, 2020, 11:14:02 pm by m3vuv »
 

Online Jay_Diddy_B

  • Super Contributor
  • ***
  • Posts: 2488
  • Country: ca
Re: 5 Transistor ESR Meter Design
« Reply #326 on: December 03, 2020, 03:14:36 am »
can this be used to measure the internal resistance of 18650 cells?.

The ESR of 18650 cells is very low around 50m \$\Omega\$

You would have to use a large value, low ESR, capacitor to block the DC voltage from the cell.

Cell ESR is normally measured at 1kHz the 5 transistor circuit works at 100 kHz.

I have modified my other ESR meter design to measure 18650 cells.

Link: https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/msg3294324/#msg3294324

This is much more suitable for measuring cells

Regards,
Jay_Diddy_B
 

Offline m3vuv

  • Frequent Contributor
  • **
  • Posts: 797
  • Country: gb
Re: 5 Transistor ESR Meter Design
« Reply #327 on: December 03, 2020, 10:39:20 am »
I already have a few 5 transistor esr meters ive built,cant i just change the oscillator caps for 1khz?,i want to use one ive already built,not build another!,cheers m3vuv.
 

Offline tomasis

  • Newbie
  • Posts: 2
  • Country: se
Re: 5 Transistor ESR Meter Design
« Reply #328 on: January 19, 2021, 03:43:29 pm »
Jay, it is an awesome design.

I wonder if I should follow your design in your first post in the thread which is dated back to the year 2013. Is there an updated diagram and component list?

I hope to able to solve the puzzle on a breadboard or stripboard. It is the first time I'm building a circuit thing.  :box: I feel restless when I cannot order Bob ESR build kit from Portugal.
« Last Edit: January 19, 2021, 03:47:03 pm by tomasis »
 

Online Jay_Diddy_B

  • Super Contributor
  • ***
  • Posts: 2488
  • Country: ca
Re: 5 Transistor ESR Meter Design
« Reply #329 on: January 20, 2021, 03:21:56 am »
Jay, it is an awesome design.

I wonder if I should follow your design in your first post in the thread which is dated back to the year 2013. Is there an updated diagram and component list?

I hope to able to solve the puzzle on a breadboard or stripboard. It is the first time I'm building a circuit thing.  :box: I feel restless when I cannot order Bob ESR build kit from Portugal.


Hi,

Have a look at this message if you want to do strip board:

Link: https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/msg1461489/#msg1461489

This looks like a nice clean layout.

Quite a few people have built this design successfully.

Good luck!!

Jay_Diddy_B
 
The following users thanked this post: tomasis

Offline billtsig

  • Newbie
  • Posts: 2
  • Country: gr
Re: 5 Transistor ESR Meter Design
« Reply #330 on: February 04, 2021, 02:01:45 pm »
Hi Jay_Diddy_B,

I am interested in building the original SMD version of this project, shown in the first post.

Can you share the Gerber files and the BOM?

Thank you.

billtsig
 

Offline zoltanh

  • Contributor
  • Posts: 18
  • Country: ro
Re: 5 Transistor ESR Meter Design
« Reply #331 on: February 04, 2021, 03:12:38 pm »
Hi,

Maybe it helps. On post 2483 you find out the pdf for toner transfer.
I built with it.
 
The following users thanked this post: billtsig

Online Jay_Diddy_B

  • Super Contributor
  • ***
  • Posts: 2488
  • Country: ca
Re: 5 Transistor ESR Meter Design
« Reply #332 on: February 04, 2021, 05:37:39 pm »
Hi Jay_Diddy_B,

I am interested in building the original SMD version of this project, shown in the first post.

Can you share the Gerber files and the BOM?

Thank you.

billtsig

Here are the files.

There are two pdfs for the artwork, one is mirrored. The board dimensions are 2.750 x 1.500 inches.

I have also attached an Excel file with the BOM. The resistors and capacitors are 0805 unless they marked.

This is what the board should look like:

[attachimg=1]


[attachimg=2]


[attachimg=3]


Regards,
Jay_Diddy_B

[attachurl=5]

[attachurl=6]
« Last Edit: February 04, 2021, 05:40:18 pm by Jay_Diddy_B »
 
The following users thanked this post: bd139, billtsig

Offline billtsig

  • Newbie
  • Posts: 2
  • Country: gr
Re: 5 Transistor ESR Meter Design
« Reply #333 on: February 05, 2021, 05:32:32 pm »
Thank you very much jay!

you are the best!
 

Offline kkamel

  • Newbie
  • Posts: 4
  • Country: eg
Re: 5 Transistor ESR Meter Design
« Reply #334 on: February 06, 2021, 01:11:08 pm »
Hi,
Anyone knows a free software to draw the meter other than Tonne Software as their free version MeterBasic only draws linear scale meters.
Thanks,
 

Offline bd139

  • Super Contributor
  • ***
  • Posts: 18034
  • Country: gb
Re: 5 Transistor ESR Meter Design
« Reply #335 on: February 06, 2021, 01:13:30 pm »
I use Inkscape for it (and a calculator!)
 

Online Jay_Diddy_B

  • Super Contributor
  • ***
  • Posts: 2488
  • Country: ca
Re: 5 Transistor ESR Meter Design
« Reply #336 on: February 06, 2021, 01:38:59 pm »
Hi,

When I made the original version I used Corel Draw and an Excel spreadsheet.


https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/msg172136/#msg172136

Using a collection of resistors, I measured the deflection with the meters original scale. The new scale was constructed from the measured data.

[attachimg=1]


Regards,
Jay_Diddy_B




 

Offline kkamel

  • Newbie
  • Posts: 4
  • Country: eg
Re: 5 Transistor ESR Meter Design
« Reply #337 on: February 10, 2021, 08:10:29 am »
Thanks
 

Offline kkamel

  • Newbie
  • Posts: 4
  • Country: eg
Re: 5 Transistor ESR Meter Design
« Reply #338 on: February 10, 2021, 08:32:26 am »
Thanks for the excellent circuit I always use it for incircuit testing with outstanding results I fixed Computer motherboard, Actifry and more than one power supply 👍
This is my implementation with cheap analog multimeter just 3 dollars 😄, I will just use Inkscape or coral draw for the scale.

[attachimg=1]

[attachimg=2]
 
The following users thanked this post: bd139

Offline zoltanh

  • Contributor
  • Posts: 18
  • Country: ro
Re: 5 Transistor ESR Meter Design
« Reply #339 on: February 14, 2021, 12:35:09 pm »
Hi Jay_Diddy_B,

I need your advice. I am thinking about adding a DC milliohm meter to this ESR meter in the same case. In your opinion is there a possibility to merge the two schematics and do not making them separate? The milliohm meter will be the classic constant current source and voltage drop measurement. The idea is if solution does allow same scale to be used. Please, let me know your advice.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf