[Elecraft] Re: Smoke Generator on KPA100

Fri Oct 4 11:33:01 2002

HI

I have built 4 KPA100 and the diagram on page 27 works. The schematic on =
page 62 appears to be incorrect on the wire numbers. I would look for a b=
ad or backwards diode (D1-D8), bad Q8, U14 installed backwards or a solde=
r bridge around the HV supply or U4. Recheck T3 there could be a short be=
tween the windings. =20

Don Brown
KD5NDB

----- Original Message -----
From: [email protected]
Sent: Friday, October 04, 2002 10:02 AM
To: Jeremiah J McCarthy; [email protected]
Subject: [Elecraft] Re: Smoke Generator on KPA100

Am Freitag, 4. Oktober 2002 16:29 schrieb Jeremiah J McCarthy:
> If R-10 is cooked, don't you think you should research the area around
> T-5 instead of T-3?
Maybe I wasn't clear enough, it was on the KPA100 were the R10 was fried,=
 it =20
is in the circuit of the high voltage bias supply, this is why I was look=
ing =20
for T3. =20
But now there is something that confuses me a little:
According to page 27 of the KPA 100 manual, The green winding has the "pi=
ns" 1 =20
and 3 and the red winding has the "pins" 2 and 4. According to page 62 of=
 the =20
same manual, pins 1 and 2 should be the ends of the same wire as well as =
3 =20
and 4 should be the ends of the same wire. Seems to be a contradiction to=
 =20
me... There is no short circuit to ground, as I checked it with my DMM. =20
Continuity is there as described in the manual and T3 is wired according =
to =20
the manual on page 27. =20

Any feedback is welcome. Well, and I will not hurry because this usually =
makes =20
disasters bigger...
-- =20
Best Regards
Mit freundlichen Gr=FC=DFen
Rolf Schr=F6der

They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. =20
- Benjamin Franklin, 1759 - =20
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