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Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Hi team,
I want to identify what these components are: the black ones with the blue arrows around the top. They don't measure a diode drop in either direction.
I'm guessing the board was from some kind of flashlamp or starter; the transformer (iron) has a tap coming out to the orange capacitor to the middle of two of the black things in series.
I'm not sure if the orange cap is supposed to resonate with the transformer secondary.
I'm not sure if the grey C, black D and carbon R in the middle of the board are an RCD snubber. If they were, what are they protecting; the spark gap?
If anyone has a better understanding of what this is or how it works, please feel free to offer your explanations!
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
by"no diode drop in either direction" do you mean a short? or do then seem open? Sometimes HV diodes have too high a Vfd to be measured directly.
It looks like a CW doubler, feeding the doorknob cap?
The whole thing seems to be an HID ignitor, the black thing at the top seems to be the inline pulse transformer. and im guessing the white thing is a sparkgap of some sort.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Thanks guys and EVR, your ideas are consistent with my experience of HV diodes having very high (eg 10V - 70V etc) drops, making them hard to test, and weird packages (varying from no markings at all, to printed ratings and no part#).
Since the datasheet specs 300Hz, I can probably replace these with microwave oven diodes.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
In an igniter type circuit they could be sidacs, used to dump a capacitor suddenly into a transformer primary to generate a striking impulse. Draw out the schematic and it should be more apparent what they are supposed to do.
Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
It looks like a two-diode CW circuit.
It also looks somewhat similar to a trigger circuit for firing off a Xenon arc lamp that I had once (may still).
The Xe lamp ran continuously at a nominal 150 W, (~22 VDC arc), but took ~10KV to start. A big HV blocking diode was between the lamp supply and the HV trigger supply/ lamp.
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Mystery component identification
