Re: I've built my own single 9V dc beck's blood cleaner

Ok I see, check how you have wired the 3.5 mm jack (the place where you plug your electrodes)
check this schematic of a jack : http://www.mouser.com/catalog/specsheets/KC-300401.pdf


check the right bottom picture of symbolic diagram of pin-out connectors. The led circuit should connect at pin 3 (from the 22uF cap)

from this schematic this led circuit is connected under pin 2:
http://www.sharinghealth.com/images/Beck_Schematic_New.pdf


you might just have these connectors mixed up, so when you insert the plug it should disconnect this led circuit from operation (this will save your battery life). This circuit have no other function but to let you know that you are still getting at least 18V dc out of your batteries.
If you have one of the active electrodes on the pin that will disconnect (led circuit), when the plug is inserted, then you have lost connectivity and the device will not function correctly.

Hope this resolves your issue.

Gill Tweet