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Old 12th September 2005, 09:19 AM   #1
leander is offline leander  Malta
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Default from +/-80v to +/-70v rails

Hey any ideas of how can I reduce voltage rails from +/-80v to +/-70v. I guess something like this as in the pic will work, any other ideas pls ?

Thanks
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Old 12th September 2005, 09:36 AM   #2
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You could use a LM317/337 but notice that it can be a bit current consuming.
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Old 12th September 2005, 09:42 AM   #3
bocka is offline bocka  Germany
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What's the reason you want to get down from +/-80V to +/-70V?
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Old 12th September 2005, 09:49 AM   #4
leander is offline leander  Malta
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What's the reason you want to get down from +/-80V to +/-70V?

Because the transformer I have is 55v-55v ac and the amp I have maximum voltage is +/-70v
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Old 12th September 2005, 09:52 AM   #5
bocka is offline bocka  Germany
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Quote:
Because the transformer I have is 55v-55v ac and the amp I have maximum voltage is +/-70v
Do you have a schematic of the amp?
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Old 12th September 2005, 10:44 AM   #6
guytou is offline guytou  France
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Don't you have 240V or 120V tap at the primary ?
That would be the most elegant way to drop about ten per cent of tension at the secondary .(i.e. , for a 220 V network ,you hook on 240V tap , for 110V network on the 120V tap .)
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Old 12th September 2005, 11:13 AM   #7
leander is offline leander  Malta
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http://www.ampslab.com/c300.htm


the transformer I have has both 240v, 120v primeries. whatis a tap ? should I hook it in series with the primary ?
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Old 12th September 2005, 12:13 PM   #8
paulb is offline paulb  Canada
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Could you unwind a few turns from each side of the secondary of the transformer?
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Old 12th September 2005, 12:14 PM   #9
anatech is offline anatech  Canada
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Hi leander,
The higher voltage may or may not be a problem. It is a good opportunity to install a voltage regulator for the amps. SOmething better than 317/337. Think of the Adcom vreg, or others.

-Chris
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Old 12th September 2005, 01:18 PM   #10
guytou is offline guytou  France
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Leander , all you have to do is the 220 on the 240 and you should have 70V at the secondary instead of 80V . Try and check.
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