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Old 22nd June 2005, 03:28 AM   #1
tade is offline tade  United States
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Default Paralelling trannies

I have a small trannie i want to use for an esl. With my amp maxed i get 130 volts at 1000 hz out of it.
If i combine four, six, or eight of these will i get correspondingly higher voltages?
I guess i will paralell the inputs, and put the outs in series.
This would make it seem i have a larger trannie than i do? One worry might be the dc resistance might drop too low on the input side. i will watch out for that.
Any ideas?
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Old 22nd June 2005, 11:06 AM   #2
Mark Kravchenko --- www.kravchenko-audio.com
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Default I think you mean Connecting them in Series

You can get more voltage drive but there will be a considerable loss in the highs and the low end as the inductances add up. Come to think of it series capacitances decline. Try it and see what you get. Just becarefull how many stages you try. You could end up arcing over a trannie!

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Old 22nd June 2005, 12:33 PM   #3
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You can connect the hi-z sides in series and the low-z sides in parallel to get maximum output voltage (watch the phasing). If the cores are very small, they will tend to saturate and distort, but it is worth trying, especially if you don't have any other trannies around.

You may have some problems with amplifier stability. This can be fixed by putting a 1 Ohm (or so) rezzie in series with the lo-z side of the trannie(s).

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Old 22nd June 2005, 12:46 PM   #4
Paul W is offline Paul W  United States
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I've done that and it does work. The largest problem I had was arcing inside the transformers at high power (voltage) so don't overdo it.
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Old 23rd June 2005, 03:10 AM   #5
tade is offline tade  United States
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I bought six of those transformers.
They have eight ohm outputs and 1 kohm center tapped inputs.
I spent an hour and a half trying to get more voltage out than i put in and freakin couldnt. i am so frustrated.

I would start connecting them together, and get increasing voltages, then with the next one, the voltage would drop by some uneven number of to zero or something wacky.
For some reason i cannot just connect the outputs of one into the inputes of another. maybe physics is wrong for me.
Also, in high or low z, what is z?
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Old 23rd June 2005, 10:48 AM   #6
Mark Kravchenko --- www.kravchenko-audio.com
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Default Physics is wrong for everyone!

You may want to figure out the pinout on the trannies first. It sounds like you are connecting them front to back and front to back.

If you have an ohm meter the easiest way to check things out is that the primary usually has the lowest resistance. The secondary has the highest resistance. When you connect your amp you connect to the lower resistance side or the primary. The speaker gets connected to the higher resistance side or secondary.

If you want to do a double stepup you connect the next trannie with the primary of the 2nd trannie connected in series with the secondary of the first trannie.

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Old 23rd June 2005, 06:17 PM   #7
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Quote:
Originally posted by tade

Also, in high or low z, what is z?
I am out of touch with the more recent abbreviations. For us "old school" types, z is an abbreviation for impedance and xfmr is an abbreviation for transformer. A trannie is something found behind the engine in a car (or is it a man who wears women's clothes?- I get so confused).

New abbreviations(?):

impedance - impizzle
resistance - rezizzle
capacitance - capizzle
reactance - razzle dazzle
admittance - admizzle
susecptance - susizzle

transformer - trannie
resistor - rezzie
capacitor - capnit

any others?

I_F
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Old 23rd June 2005, 06:24 PM   #8
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Default Re: New abbreviations

ROFL ... I just about fell out of my chair when I read that
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Old 23rd June 2005, 08:45 PM   #9
tade is offline tade  United States
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i never quite could stomach using x for cross or trans of christ etc.
x-ing
xfmr
x-mas

my project thusfar is a complete failure.
Laugh if you feel the urge.
Using these small xfrms as a voltage swing, and the high voltage supply ganked from a one time use camera flash, i got sound out of my speaker, which is awesome! A proof of concept. After about five seconds with my amp maxed out, barely audible, the transformer melted. fun.
i got my hands on some vacuum tubes. i think one of em is a tube with two triodes in it. are tubes as easy to do as heat up the emitter, and apply a voltage to the gate?
can i use the tube to modulate the output of the flash circuit, +-200v?

If this question seems too base dont waste time answering!
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Old 23rd June 2005, 08:49 PM   #10
Mark Kravchenko --- www.kravchenko-audio.com
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Default LOL

Stupid is as Stupid DUzz

Mark

I have to agree with all these short forms. I promise to use the proper wording from now on.
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