WELL. . . .BLOW MY MIND. . .DEJA VU. . . .
I had composed this on laptop. . . .but did'nt have Internet access. . .nor even viewing capability. . . until just now, BUT, I'm placing it on, in its entirity, as there were some topics yet uncovered.
73's de Edd
Thanx for drawing up the schema. . .as all was a bit iffy until seeing that. I am in concurrence of the circuitry needing a "PUTT_PUTT_PUTT" in that application, in kicking repetetive drive to that pulse transformer.
Then, it provides the gate drive to the ESS-CEE R'UH's.
Initially, check the health of that zener on the anode circuitry of the dee-vice, should it be so simple that its junction has crashed and that is all of your trouble.
Also, double check the accuracy of your derived circuit schematic against the actual wiring in the yellow boxed referencing.
Theeeeen. . . . if you have a scope, check at the cathode of the PUT for an outputted pulse, whilst you run the charge pot up and down its range.
If all of thaose tests come up fruitless, then I guess that you are about to have to spring for a PUT.
I have sevaral. . . . .SOME....where ??? Inventory items # 2,803,017 thru 21. . .but can't put my hands on them.
In the past, I know that some one had some new PUT's on this site and had to ask us to identify as to what they were.
At least. . . . you can still get them.
I have a WW Grainger charger that probably uses the same circuitry, but have never had problems with it, thus no need to explore its circuitry.
73's de Edd
[email protected] ...........(Interstellar~~~~Warp~~~Speed)
[email protected].........(Firewalled*Spam*Cookies*Crumbs)
Why isn't 11 pronounced onety one?
REFERENCE. . . .MARKED UP WORKING SCHEMATIC: