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Sir Andy . . . .United Kingdom ?
Can anyone, fo' sho', confirm that S100-6 IS a SCR ?, and not actually being a flat pack HV Mosfet. . . . . . now, full size 106 SCR's I has KNOWED abouts . . . . for quad / quinti decades.
Why for the GEEEE-I-ANT Poly caps that are being strung outside of the circuitry . . . if subbed in for the "charge" capacitor which fires the semiconductor, asurredly they would have too
great of a time constant, to charge up quickly enough.
One usually finds a .01---.05 @ 1kv cap being used for this applicaton.
I just made alterations, to make a quick tack in illustration of the typical trigger transformer, which is usually arranged as an autotransformer, I may have the GREEN and BLUE wires reversed
from their proper connections.
Those connections apparrently have to pass across the board, to reach to their SCR ? Mosfet ?
Referencing to the addditional HOW-TO schema, generously provided by our Most Honorable and Esteemed colleage . . . . GPG . . . . .
Take digital voltmeter ( versus a common analog VOM, which would LOAD down) in hand and check to see if the R9 marked resistor might have your 38V on one of its ends and have the 370 V
supply on its other end, and ceramic cap C2 might just be the one that charges up from R9 and fires the primary of the trigger transformer.
Then check R9's actual resistance, as usually higher than 40 V is being used to "ping" a trigger transformer.
If so, C2 may be leaky if under voltage spec'd.
An ole po' boy test for your HV output of the trigger transformer at the RED line mark ups would be to use one of the neon lamp "flicker" test lamps to ground, (or a NE-2 family of lamp, should
you have one ) while you fire up and ping the unit.
It should flash quite bright.
That Flickee-flickee . . . . . . . . . .its-a-look-a-like-a-dis . . . . . . . .
I marked in the YELLOW and RED arrowed LED and phototransistor, being used as a photo-interruptor pair, but they seem to be operarting all right . . . . as per your given readings.
Le Picture . . . . . . . .
You do know that this is the right time of the year that you can drag leather or rubber soled shoes across the carpet and get a good solid spark to ground.
Meaning . . . . . . that if you just have the floating trigger wire ring, wound around the one end of the flash tube, . . . . . being disconnected from trigger transformer circitry.
Grounding the battery negative connector, and placing a carpet CHARGED fingertip to the trigger wire ring should fire the flash tube if charged up.
O r r r r r r r r r . . . . . if you have a one Amellican dollah / Chinese piezo "firestarter" and bare a 1/4 inch end of hook up wire and place a slightly larger piece of spaghetti tubing around it, it is possible
to route down to make the new wire connect to the wire that normally arcs to the shell to make a spark. The spaghetti insulates the pair so that the HIGH voltage is conserved by virtue of no sparkover
then being possible. Then the other end of the hook up wire provides that excitation HV to the flash tube trigger ring, if your left hands finger "grounds" to the battery negative .
Any resultant tingle is being no worse that a typical carpet static shock.
Query:
Is the blue HV storage electrolytic rated at 400VDC and ????? capacitance ?
What is the quasi- clear plastic ring (shower curtain ring ) under the HV side of the flash tube and the HV cap . . . . .being just a precautionary item that you used to insulate and hold up those components ?
Thasssit . . . . .
73's de Edd
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