Author Topic: 5 Transistor ESR Meter Design (Read 308524 times)

m3vuv · « **Reply #250 on:** August 22, 2019, 09:05:50 am »

Hi i used the latest version of your pcb layout,you have the base conections inverted,ie what routes to base of q3 should go to the base of q4 and what goes to the base of q4 should go to q3,regards m3vuv.

m3vuv · « **Reply #251 on:** August 22, 2019, 03:19:35 pm »

heres some pics of the one i just built,reads slightly high as i need to tweak the meter series resistor.

m3vuv · « **Reply #252 on:** August 22, 2019, 03:22:12 pm »

not all uploaded.

m3vuv · « **Reply #253 on:** August 23, 2019, 08:10:10 am »

is there anyway another transistor could be added onto this so it can drive a 1ma fsd meter movement as ive some lovely big meters in cases from the 1960s but all 1ma fsd.,also an add on to check shorted caps maybe?

bd139 · « **Reply #254 on:** August 23, 2019, 12:26:39 pm »

I think you'd need a higher supply voltage and much lower impedance at the actual rectifier bridge I reckon before that would be possible. Adding emitter followers after Q4/Q5 might do the trick but I haven't simulated it.

Nice looking build BTW

m3vuv · « **Reply #255 on:** August 25, 2019, 11:02:51 am »

your r15 680 is marked as r14 on mine,says 27k originaly,do you have them mixed up?,thats on the high power mod.

m3vuv · « **Reply #256 on:** August 30, 2019, 10:26:32 am »

whats going on here?,the both schematics seemed to have a mix up with r12 -13-14-15 and 16,both shematics are different also which one corresponds to the thru hole component/silkscreen?,makes it hard work with silly cockups like that,can it be sorted?.cheers paul m3vuv.

m3vuv · « **Reply #257 on:** September 02, 2019, 01:46:00 pm »

so mr diddy can you explain which schematic corresponds to which silscreen(ie component placement) pic?

mauroh · « **Reply #258 on:** September 03, 2019, 10:26:05 am »

Hi m3vuv,
I just played spot the difference for few minutes with the original schematic from Jay_Diddy_B against the one I used to make my PCB routing and I really can't see anything that could prevent my circuit to work.
The DRC is fine and all the traces should go to the coorrect component.
In the silkscreen I privided, on top of the components you have the value of the components to place.
I'm not getting what it is wrong with the schematic or with the PCB and what it is mixed up in the components you have listed.

In few weeks I hope to have the spare time to build it and sort this out.

I have attached the comparison between the schematics.
Please let me know what I'm not seeing.
Thank you
Mauro

m3vuv · « **Reply #259 on:** September 03, 2019, 11:30:13 am »

it was the base connections were inverted think it was q4 q5 base connections were swapped,only spotted it as the board was thin and holding it up to the light i could trace the routing,hope that helps.

m3vuv · « **Reply #260 on:** October 30, 2019, 04:20:38 am »

seems to have died a death,still looking to use it with a 1ma fsd meter,any ideas how to do this?,cheers all m3vuv.

X.G. · « **Reply #261 on:** April 01, 2020, 07:45:20 am »

my 3 transistors ESR meter design:

http://www.crystalradio.cn/forum.php?mod=viewthread&tid=1623736&extra=

m3vuv · « **Reply #262 on:** April 01, 2020, 08:56:15 am »

still no solutions to use a 1ma fsd meter movement yet then?

X.G. · « **Reply #263 on:** April 01, 2020, 09:16:25 am »

another ESR meter design from China.it (and mine) can use the anologe multimeter scale,and only use one IC.

TDA1308 can work at 3V~5V ,so you can use Li-rechargeble battery for it. if you have not TDA1308,you can use NE5532 at 7V~9V

R7=the centre value of scale,R5=R6=2*R7

http://www.crystalradio.cn/forum.php?mod=viewthread&tid=511567&extra=&page=1

m3vuv · « **Reply #264 on:** April 09, 2020, 06:26:52 pm »

please someone mod the circuit to make this good to work with a 1ma fsd meter movement,or mod the schematic for me please,im lost on doing this.,cheers m3vuv.

Jay_Diddy_B · « **Reply #265 on:** April 10, 2020, 11:36:50 am »

Hi M3VUV and the group,

Here is a simulation for using a 1mA meter movement.

I have not built this circuit - it is experimental - try at your own risk
Report your results

Model

There are notes on the model regarding component selection.

Modelling Results

The modelling results suggest that this should work.

If this doesn't work look for a more sensitive meter.
Most analog VOM or AVO that 20,000 $\$\Omega\$$ per volt have 50uA movements.

Regards,

Jay_Diddy_B

m3vuv · « **Reply #266 on:** April 10, 2020, 12:28:26 pm »

cheers i will give it a try.

m3vuv · « **Reply #267 on:** April 11, 2020, 11:09:58 am »

Hi jay nice work,can i assume this can be used with your tonner transfer pdf by subing the comp values?,cheers m3vuv.

Jay_Diddy_B · « **Reply #268 on:** April 11, 2020, 12:23:26 pm »

Quote from: m3vuv on April 11, 2020, 11:09:58 am

Hi jay nice work,can i assume this can be used with your tonner transfer pdf by subing the comp values?,cheers m3vuv.

Yes, build it using the same artwork.

Build it like this one:

https://www.eevblog.com/forum/projects/5-transistor-esr-meter-design/msg2635062/#msg2635062

Just change the component values.

Regards,
Jay_Diddy_B

m3vuv · « **Reply #269 on:** April 12, 2020, 04:07:04 pm »

can this silscreen art be posted as a jpeg?,otherwise its a twat to scale when printing,cheers m3vuv.

Jay_Diddy_B · « **Reply #270 on:** April 12, 2020, 05:44:28 pm »

Quote from: m3vuv on April 12, 2020, 04:07:04 pm

can this silscreen art be posted as a jpeg?,otherwise its a twat to scale when printing,cheers m3vuv.

Hi,

There are two jpeg. One is mirrored in case you want to do toner transfer.

Jay_Diddy_B

m3vuv · « **Reply #271 on:** April 12, 2020, 07:50:04 pm »

sorry i cocked up,meant to say pdf,regards m3vuv

Jay_Diddy_B · « **Reply #272 on:** April 12, 2020, 08:22:09 pm »

Quote from: m3vuv on April 12, 2020, 07:50:04 pm

sorry i cocked up,meant to say pdf,regards m3vuv

Here you go...

Regards,
Jay_Diddy_B

m3vuv · « **Reply #273 on:** April 13, 2020, 09:13:28 am »

Many thanks jay.73 m3vuv.

m3vuv · « **Reply #274 on:** April 13, 2020, 05:53:38 pm »

have you this version in pdf as well,as it shows the track routing,cheers Paul m3vuv


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Author Topic: 5 Transistor ESR Meter Design (Read 308524 times)

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