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LF: RE: Big PA

To: [email protected]
Subject: LF: RE: Big PA
From: "Talbot Andrew" <[email protected]>
Date: Wed, 23 May 2001 15:19:36 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Could you give me info on the little pot-core you use for your driver
transformer in your PA? Material, turns?
I used a Farnell 559-570 ferrite sleeve, intended for EMC suppression,
no info on material, 16 turns on primary (1.1 mH) and 29 turns

It is a pot core, RM10 size and must be ungapped and needs to be this big to
get all the insulated turns on, although for power requirements alone, a
much smaller core will do.  The core is otherwise OK for 50 Watt SMPSUs.
Material 3C85 or similar for SMPSU use.   12 turns on all windings, ie 3 x
12 in total - two windings for the FETs and one input.  1:1 turns ratio is
ideal, as the FETS are then switched with a +/- 15 V drive signal, assuming
the TC4426 is run from a 15V rail.

The TC4426 gives out a 0 - 15V waveform so directly coupling into a
transformer..........
I guess it only survived at all coz of some sort of protection built in !

Also, ferrite material designed for EMC use is designed to be lossy - this
sort of sleve / core should never really be used for anything other than
suppression.

I can supply an 81K size   .PCX file of the full circuit diagram.  If anyone
wants a copy please contact me directly as it is too big to send on the
reflector.   Does anyone want to host it on their web page ?

In view of the EMail problems on this account earlier, can you also copy
requests to [email protected] just in case this packs up again.

Andy  G4JNT


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