Output transformers

rsumperl · 28th March 2010, 10:39 PM

Greetings everyone,
So...if I had a 100 watt transformer with a 1900 ohm primary and a 4 ohm secondary, if I put an 8 ohm load on the secondary, I should have a 3800 ohm primary. My question is, is there anything wrong with doing that if I needed a 3800 ohm primary?

Thanks,
Ray

Tom Bavis · 29th March 2010, 01:43 AM

Yes, it will work. The maximum voltage remains the same for core saturation, so it will be a 50W transformer at the low end. There will probably be enough inductance for good low-frequency response, and copper loss will be low. Inter-winding capacitance MAY limit the high end, though leakage inductance won't be a problem.

Gordy · 29th March 2010, 01:47 AM

Most loudspeakers vary in impedance anyway, so at some frequency a 4 Ohm speaker would most likley look like an 8 Ohm speaker. You should be fine!

28th March 2010, 10:39 PM	#1
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	Output transformers Greetings everyone, So...if I had a 100 watt transformer with a 1900 ohm primary and a 4 ohm secondary, if I put an 8 ohm load on the secondary, I should have a 3800 ohm primary. My question is, is there anything wrong with doing that if I needed a 3800 ohm primary? Thanks, Ray

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29th March 2010, 01:43 AM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Yes, it will work. The maximum voltage remains the same for core saturation, so it will be a 50W transformer at the low end. There will probably be enough inductance for good low-frequency response, and copper loss will be low. Inter-winding capacitance MAY limit the high end, though leakage inductance won't be a problem.

29th March 2010, 01:47 AM	#3
Gordy diyAudio Member Join Date: Nov 2006	Most loudspeakers vary in impedance anyway, so at some frequency a 4 Ohm speaker would most likley look like an 8 Ohm speaker. You should be fine!

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