ESR & low resistance test meter - free circuit

I've gone all these years without one but I might give this cct a try. Any idea of the twin screened / coax? cable characteristics, min/max lengths ?, just cruddy old audio interconnect shielded cable sufficient ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

I'd use some of that twin flexible stereo cable (grey?) if you have it but I have no more info on the circuit.

"N Cook" wrote in news:ei04l9$4em$ snipped-for-privacy@inews.gazeta.pl:

Although labelled "Twin Shielded Cable", the schematic is drawn to show two *single-conductor* shielded cables, one to deliver the test signal to the cap, and one to sense the response across the cap.

That was a fairly standard item once - looks like zip cord but has two shielded cables in it.

Don't forget that it needs +/- 5V supplies which need to be regulated so the calibration won't drift.

You might also like this circuit:

While you're there, check out the rest of his electronics designs:

John

Or you can buy a kit ESR meter assembled by Dick Smith and designed by Bob Parker... only $71.95 from us (with MOV protection option). This unit goes down to 0.01 ohms... and is self contained! I've sold well over 500 so far...great kit! Everything you need is in the package - well, you could get some better probes than come with the kit, and you will need some batteries .

Sell regularly to the Oshawa GM Truck assembly plant for training their techs. Have also sold one to Seventh Day Advantists (SP?), Motorola (out at NASA), some folks in the battery calibration business, and lots of radio/TV/transmitter folks...

John :-#)#