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LF: FET's etc for LF.

To: [email protected]
Subject: LF: FET's etc for LF.
From: [email protected]
Date: Sat, 25 Dec 1999 10:49:23 EST
Reply-to: [email protected]
Sender: <[email protected]>
Hello Group

and a very merry Christmas to one and all.

If anyone is planning a little home construction over the holiday period you may like to look at a FET marketed by RS Components as an alternative to the IRFP450.
STW34NB20 RS catalogue number 313-2920.

Voltage         500 V
Current         34 Amps
Power Diss      180 Watts
Rds  ON     0.08 Ohms
Package     TO247   as   IRFP450 etc.  Drain connected to tab.

Price #2.78  + VAT  in 1 off.

A small test circuit using two of these in class D comfortably produces 350 Watts at 86% efficiency after the low pass filter. I've tested with supplies from 24 to 60V and with qrss. As the Rds on is less than a quarter of the IRFP450, the device may also be OK for lower Voltage operation.
I've also recently purchased a supply of 3C85 toroids from Philips.
As there was a minimum order charge I've bought some of the 58mm cores and
some smaller 15 x 8 x 5.5mm (OD ID H) which are very useful for
directional coupler elements. If a VSWR bridge is on your "to be built" list,
and you need a core, let me know.
73   es a "bug free"  y2k

David   G0MRF

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