ESR Meter Adapter Design and Construction

[kripton2035]

I initially forgot to put the capacitor in my dual frequency version, and when I install it afterwards, I don't notice any change in the measured values, at 1 or 100KHz.
that's why i asked for the purpose of C1.
thanks for your answer.

[aleksejsm]

I initially forgot to put the capacitor in my dual frequency version, and when I install it afterwards, I don't notice any change in the measured values, at 1 or 100KHz.
that's why i asked for the purpose of C1.
thanks for your answer.

Can you share your version of dual band ESR Meter please?

[kripton2035]

it is sort of working, but I made big mistakes for the first pcb, and the working prototype is really messy
lots of cutted tracks, jumpers...
I have to clean all of this, still some more programming to clean too
and make a new clean pcb for it.
please be patient a little more...
ps: the schematic will be free and published on my web site (and here too) , but the gerbers for the pcb will be for sale as it is a lot of work.

[Texmisure]

@Jay_Diddy_B,

Can i change R13, R14 with 10k resistor? Thank you for your help and con division.

Texmisure

[Bror Ek]

Well, even after 10 years, it's still possible to simplify a design 

As there's a spare ⅓ 4053 switch pair,  it can be repurposed as
an oscillator, thus freeing one op-amp (or for other use).
One resistor less is needed as well.

I put the osc-part demo schematics and info.txt here:
https://groups.io/g/LTspice/files/Temp/Hysteres%2020_70%25%20Virtual%20External%20Input%20Port%20Buffer+Test-Demos.zip

The simulation model is aimed for the classic CD4053,
so the frequency should be adjusted with a real chip.

/Bror Ek

[Jay_Diddy_B]

Snip ...

I put the osc-part demo schematics and info.txt here:
https://groups.io/g/LTspice/files/Temp/Hysteres%2020_70%25%20Virtual%20External%20Input%20Port%20Buffer+Test-Demos.zip

Snip ...


/Bror Ek

Bror,

Please attach a screenshot of the schematic modification and attach the .asc file to your post. I can't see the schematic on the groups.io website without signing up.

If your simulation uses models that are not included in the standard LTspice installation, please create a zipfile with everything that is required.

Thanks!!

Jay_Diddy_B

[Bror Ek]

Jay,
Hope this helps -

(The RC   'C' should perhaps be increased a few times as long as
a smaller  'R'  won't load to much)

/Bror

[Jay_Diddy_B]

Bror,

I checked the Nexperia and the TI datasheets for the 74HCT4053. I do not see any hysteresis on the inputs. If there is no hysteresis this oscillator will not work reliably.

Jay_Diddy_B

[Bror Ek]

Yes Jaj, I can not see any specific Schmitt spec,
though in this application the signal edges are distinct and
the switch families gap point levels are well separated,
so in practice there should not be any problem -
see some chip spec. examples further below.

I have no sample in stock to verify yet as the only local over the desk
professional supplier for 2M people closed and I will only mail-order
for some min. items collection.

But I plan to build your design in any working version later as this
is what every household needs 


MC74LVXT4053-
Minimum High−Level Input Voltage, Channel−Select or Enable Inputs: 2.0v (stable at all temperatures)
Maximum Low−Level Input Voltage, Channel−Select or Enable Inputs:  0.8v (stable at all temperatures)
Results in a switch gap of min. 1.2v


TI CD74HC(T)4053 - at Vcc 5v
Min. High-level control input voltage: ~ 3.5V
Max.  Low-level control input voltage: ~ 1.5V
Results in a switch gap of min.  2.0v
(the simulation is closest to this family)

TI New version spec release 03 Mar 2023, TMUX4053 single supply (5 V to 24 V) or
dual supplies (up to ±12 V), or asymmetric supplies.
Min. High-level control input voltage:  1.35V
Max.  Low-level control input voltage:  0.8 V
Results in a switch gap of min.         0.55v
(this might result in close to 4 times higher frequency for the same RC?)
- This chip is also very fast.

/Bror

[hbozyq]

After all these years, which version is the "final" version? I still have interest in build one.