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LF: output transformer problems

To: [email protected]
Subject: LF: output transformer problems
From: "Dick" <[email protected]>
Date: Tue, 18 May 2004 22:06:21 +0200
Reply-to: [email protected]
Sender: [email protected]
Hello all,

due to circumstances I'll have less time to work on the transmitter.

Meanwhile I tried several other transformers, as well as some
other things, like disconnecting the Scottky diodes and the 470nF
C's .
Now I have 6R8 from the TC4426 direct to the gates, which
are grounded with 47k resistor.
I tried all kind of things around the FET's with other C's to ground or
with C-R to ground etc.
Some progress has been made, but still difficult.

The ouput filter seems to have a quite large influence on the over all
drain current.
Also the value of the capacitor that grounds the centre tap is important.
In my case I found better results at 330nF.

Several available cores tested, like 3C11 (white) and 3E1 (green) both 36mm.
Also tried an T106-26 from an old computer SMPS.

Wonder what current I should have when applying lower supply voltages
to the FET's.
For example. what currents to others have at 15V or 20V or so.

73, Dick, pa4vhf

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