EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: mlloyd1 on October 01, 2024, 09:57:53 pm
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Looking at a consumer electronic product for US market that uses a GDT paralleled with a 200K ohm/1/2w resistor and that combination is in series with a 15ohm/5w to across the powerline protect the product from surges.
The product is undamaged when hit with surges (tested to about 6KV) and resumes operation afterwards, just as it should.
I understand the reason for the series 15-ohm resistor (basically limits current when GDT fires), but can't explain the 200K in parallel.
My WAG is something to do with maybe helping the tube recover faster after the internal plasma returns to gaseous state after the surge.
But like I said, that's a WAG.
Anybody know the "REAL" answer? ??? :-//
Enquiring minds want to know ....
mlloyd1
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Perhaps to bleed static so it does not build up.
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Could it be a bleeder resistor for some capacitor elsewhere in the box?