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ESR Meter Adapter Design and Construction

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sarbog:
I   am   68  years old ... used  5x  magnifier to  solder   the surface mount  components    for  the board made by  JLCPCB... The   two  signal  diodes  1N4148  in  surface  mount  are in    back   order  from  DigiKey..........      about   6 months...

Jay_Diddy_B:
sarbog,

The 1N4148 diode is a very common small-signal switching diode. I did a quick check on Digikey.

Try this part number: 1N4148WQ-7-F   or 1N4148W-G RHG

What you need is a small-signal diode, in a SOD-123 package.

It is great to see people building the project that I posted. Thank you for sharing.

Regards,

Jay_Diddy_B

sarbog:
Thanks,  I  will add a few of the diodes to my next Digital-Key order.

kripton2035:
@Jay_Diddy,
I have a question about the schematic @1KHz (https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/msg3296986/#msg3296986)
Why did you add the 100µF capacitor C1 ?
thanks.

Jay_Diddy_B:

--- Quote from: kripton2035 on September 01, 2021, 03:01:30 pm ---@Jay_Diddy,
I have a question about the schematic @1KHz (https://www.eevblog.com/forum/projects/esr-meter-adapter-design-and-construction/msg3296986/#msg3296986)
Why did you add the 100µF capacitor C1 ?
thanks.

--- End quote ---

Hi Kripton2035,

The resistors R13 and R14 form a mid-point between +5V and 0V. The capacitor lowers the impedance for ac currents. A higher value capacitor is needed, to get the same impedance when the circuit was modified for 1kHz.

If you want to make a dual frequency version, you can leave the 100uF capacitor in place when operating at 100kHz.

Jay_Diddy_B

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