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10KHz-55Khz transformer

K

Kieth Greiner

Jan 1, 1970
0
I am looking for an output transformer that will do 10KHz to 55KHz
with a reasonable degree of linearity of the entire range.

Is this possible? If so, what type and construction should I be
looking at.

Ketih Greiner
 
B

Bruce Varley

Jan 1, 1970
0
Kieth Greiner said:
I am looking for an output transformer that will do 10KHz to 55KHz
with a reasonable degree of linearity of the entire range.

Is this possible? If so, what type and construction should I be
looking at.

Ketih Greiner

I presume you mean 'reasonably flat frequency response'. I made an
ultrasonic drive transformer with a large ferrite toroid and bifilar
windings. The toroid was about 80mm OD, cross section maybe 15 x 10mm. Can't
recall the number of turns, or the actual LF rolloff, but it was 'several
KHz'. It went to well above 50, and handled a heap of watts.

All this will also depend on what power capability you require, btw.
 
J

Joerg

Jan 1, 1970
0
Kieth Greiner wrote:

I am looking for an output transformer that will do 10KHz to 55KHz
with a reasonable degree of linearity of the entire range.

Is this possible? If so, what type and construction should I be
looking at.

Sure. Best would be to get some #77 ferrite toroids. Amidon would be one
source. Maybe 3/4" O.D. if you don't have to transfer a lot of power,
else get a fat one. If you want to be extra good you can twist the
windings to make it bifilar. The ARRL Handbook usually has some nice
pictures in there on how to wind it, probably also on the web somewhere.

It can also be done with other cores, for example pot cores scrapped out
of computer power supplies.
 
W

Wimpie

Jan 1, 1970
0
I am looking for an output transformer that will do 10KHz to 55KHz
with a reasonable degree of linearity of the entire range.

Is this possible? If so, what type and construction should I be
looking at.

Ketih Greiner

Hello Kieth,

Whether this is simple depends on some other specifications. I am
thinking of power (voltage and current) to be transferred, isolation
voltage and capacitance (between windings), DC current through
windings, etc..

When the isolation is functional only (so no electrical safety is
involved), and requirements with capacitance are not that stringent,
it can be easily done up to several hundreds VA. However when there
must be very low capacitance or (for example) 3500V double insulation
safety requirement, it will be more difficult to keep low both linear
and non-linear distortion.

Maybe you can provide us some more information.

Best regards,

Wim
PA3DJS
www.tetech.nl
 
R

Rene Tschaggelar

Jan 1, 1970
0
Kieth said:
I am looking for an output transformer that will do 10KHz to 55KHz
with a reasonable degree of linearity of the entire range.

Is this possible? If so, what type and construction should I be
looking at.

This device is called current compensated inductor
and has two windings of equal numbers.
Used in power filters and such.

Rene
 
J

Joerg

Jan 1, 1970
0
Rene said:
This device is called current compensated inductor
and has two windings of equal numbers.
Used in power filters and such.

In American that would be called "common-mode choke". But the core
saturates real quick and you have to check the breakdown voltage between
the windings. It's usually not very high.
 
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