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Old 2nd July 2004, 04:15 AM   #1
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Default 32v transformer suitable for gainclone?

I've got an E core transformer from an old amplifier just sitting around (its in good condition) and was thinking I could use it to build a Gainclone. The amplifier was rated for 230watts power input so I figure that the transformer is large enough to power a gainclone. The only problem I see is that its secondaries voltage is around 30vac. After rectification and filtering, thats around 42 volts + and -42. Is that too high for the IC? If so, what (preferably easy ) methods are there to get the voltage back down to an acceptable level? I plan on driving 2 8ohm compression drivers with the amplifier, so it will rarely be pushed to max output levels.

Thanks!
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Old 2nd July 2004, 04:20 AM   #2
aHobbit is offline aHobbit  Philippines
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42Vdc is max allowed on LM3886, so this is fine. Using a regulator like the LM338 can bring down your usable Vdc to the 3886 to about 37Vdc.
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Old 2nd July 2004, 04:57 AM   #3
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Well in another thread it says 42v is too high. So, what ways can I get the voltage down, if any?
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Old 2nd July 2004, 05:02 AM   #4
Will is offline Will  Malaysia
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42 volts is fine. Im using that voltage and liked the sound of my VBIGC. Just make sure your heat sinks are sufficient.


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will.
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Old 2nd July 2004, 05:46 AM   #5
MWP is offline MWP  Australia
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Quote:
Originally posted by Will
42 volts is fine. Im using that voltage and liked the sound of my VBIGC. Just make sure your heat sinks are sufficient.
2nd'ed.

I also run 42V... no problems in the 4 years since i built it.
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Old 2nd July 2004, 08:01 AM   #6
aHobbit is offline aHobbit  Philippines
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42Vdc will be quite too high if you intend to load it with a speaker lower than 8 ohms. However, as I said, if you want to lower it, for whatever reason it may serve you, you may use an LM338 regulator, and it can give you 32Vdc highest.
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Old 2nd July 2004, 08:48 AM   #7
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my txs' secondaries are also 30VAC - i posted a psu schem in this thread: regulated psu for gc yesterday which -I think- is okay...

hth
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Old 2nd July 2004, 08:57 AM   #8
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Default Re: 32v transformer suitable for gainclone?

Quote:
Originally posted by Jerry Parker
I've got an E core transformer from an old amplifier just sitting around (its in good condition) and was thinking I could use it to build a Gainclone. The amplifier was rated for 230watts power input so I figure that the transformer is large enough to power a gainclone. The only problem I see is that its secondaries voltage is around 30vac. After rectification and filtering, thats around 42 volts + and -42. Is that too high for the IC? If so, what (preferably easy ) methods are there to get the voltage back down to an acceptable level? I plan on driving 2 8ohm compression drivers with the amplifier, so it will rarely be pushed to max output levels.

Thanks!
I think it will do but as you know it's just about on the edge.

Note also if you have no input signal the max voltage is 94 volts (2 x 47) so if you play a little the voltage probably will drop a bit.

If you had a toroid transformer the max voltage would have been 2 x 30 VAC. The normal max voltage is 2 x 28 VAC.
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