ESR meter modification

[pgr2002]

I built this yorkie's ESR meter which is working as described. Can anyone tell me how to modify this circuit to include an LED to display when a capacitor is tested and is found to be shorted. I attach this diagram.

 

[KlausST]

Hi,

you want to detect a shorted capacitor.

What is your idea to differentiate your shorted capacitor against
* a shorted diode
* shorted resistor
* a shorted inductance
* any short at all

I mean: If a capacitor is shorted, then it does not act like a capacitor anymore...

Klaus

 

[pgr2002]

Hi,

you want to detect a shorted capacitor.

What is your idea to differentiate your shorted capacitor against
* a shorted diode
* shorted resistor
* a shorted inductance
* any short at all

I mean: If a capacitor is shorted, then it does not act like a capacitor anymore...

Klaus

It must be like the Jay Diddi's 7 transistor ESR meter where led is placed to detect a shorted capacitor.

 

[danadakk]

One of the early DIY designs in US was the Anatek Blue ESR meter. Notice on back its graph of ESRs as a f() of V and C of cap. Its design included a micro to manage the instrument.

https://anatekinstruments.com/colle...ts/fully-assembled-anatek-blue-esr-meter-besr

https://www.flippers.com/BlueEsr.html

Finally built the Bob Parker "Blue" ESR Meter - Badcaps

Technical discussions concerning soldering techniques, usage of test equipment, how it works, what's best, and some pointers in using it all.

www.badcaps.net

Regards, Dana.

 

[Kripton2035]

I always thought the original design of the blue-esr meter was an australien dick smith one ?

--- Updated Nov 4, 2023 ---

It must be like the Jay Diddi's 7 transistor ESR meter where led is placed to detect a shorted capacitor.

then why didn't you build the Jay Diddi one ?

 

[danadakk]

According to this looks like it was a spin off of Smith design.

https://anatekinstruments.com/es/products/anatek-blue-esr-meter-full-kit-for-self-assembly-besr_kit


Regards, Dana.

 

[D.A.(Tony)Stewart]

One of the early DIY designs in US was the Anatek Blue ESR meter. Notice on back its graph of ESRs as a f() of V and C of cap. Its design included a micro to manage the instrument.

https://anatekinstruments.com/colle...ts/fully-assembled-anatek-blue-esr-meter-besr

https://www.flippers.com/BlueEsr.html

Finally built the Bob Parker "Blue" ESR Meter - Badcaps

Technical discussions concerning soldering techniques, usage of test equipment, how it works, what's best, and some pointers in using it all.

www.badcaps.net

Regards, Dana.

Nice features, and the graph leans between low ESR types and std e-caps which tend to be >10x greater ESR.
Since in any given cap family at fixed DC rating ESR*C= fixed T and the plot shows 10:100 range in C values.
ESR is also proportional to aspect ratio D/H as tall caps have more rolled foil in parallel for the same C value.

 

[pgr2002]

I always thought the original design of the blue-esr meter was an australien dick smith one ?

--- Updated Nov 4, 2023 ---

then why didn't you build the Jay Diddi one ?

I already built the Jay Diddi's esr meter now I want this (short cap) feature in Yorkshire's esr meter. How to modify or add a circuit for this?

 

[D.A.(Tony)Stewart]

I built this yorkie's ESR meter which is working as described. Can anyone tell me how to modify this circuit to include an LED to display when a capacitor is tested and is found to be shorted. I attach this diagram.

This design does not apply DC across the probes due to C5 and R18. Therefore the D.U.T probes see no difference between a 0 ESR cap and a short. In order to test for a S.C. you must apply a DC voltage or current across the TP 1&2 and detect this DC voltage, which goes against the design criteria, meaning a different tester like an Ohm Meter. Nice try though.