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zome 16th June 2009 04:30 PM

can I use this transformer to power the opamp based preamp?
I'm not sure what the label means. It says 22V----0----22V. (please see picture)

Does it mean already it has 22V and -22V?

If it's not (I'm a newbie, as you can see), is it possible to make it + and - rails? (More precisely I want +15 and -15, I guess I can use 7815 and 7915 voltage regulator?)

thank you!

454Casull 16th June 2009 05:22 PM

The 22-0-22 is too much for +/- 15V, while the 12-0-12 is too little. You can use the 12-0-12 winding with 7812/7912.

cbdb 16th June 2009 05:40 PM

Not to mention its a 300 watt transformer when 30 would probably be overkill.

Minion 16th June 2009 11:27 PM

You can use the 12v-0v-12v to get +/- 15v Unregulated , it will probably be closer to +/-17v but many Opamps can handle +/-18v , but 12v regulators would be better .....

The transformer would be good for a Dual chip Gainclone with a Preamp and/or active EQ section ......

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