Transformers

[seahag]

I`m looking at a catalog here at work and the hammond
transformers are rated by series and parallel.

is the series denotation 24V ct @ say 6.3amps
mean I need 48v one? for +- 24v?


sry for a noob question....

 

[MikeW]

24 V center tap is 12-0-12 volts AC if you want to run split rails. That would give you about +/- 16.5 volts after rectification.

 

[wes-ninja250]

Or, you could in theory run two identical 24V transformers and ignore the center tap entirely, for an effective 300VA available power and ~34V rails.

But that's not often cost-effective.

Wes

 

[ofb]

seahag,

which model number are you looking at?

hammond has a useful page here
http://www.hammondmfg.com/5CHook.htm

see also
http://myweb.tiscali.co.uk/nuukspot/decdun/gaincloneFAQ.html
http://www.audiosector.com/nigc_kit-users_guide.pdf

dual secondaries to two bridges is more usual for gainclones btw, not ct. like this,
http://gainclone.com/invertedLM3875_r2_1.gif

if you want +-24 at the chip after rectification and capacitance, divide by 1.4 to get 17.

so something like 182G18 or 182N18 then.
http://www.hammondmfg.com/182.htm

 

[seahag]

Nice. I thought so. Its been about a year since i built my first gainclone.

Didnt really size the transformer right (120 va) and only used one bridge for 2 channels.

I want to do it a little better this time.. been thinking about that improved 3886 project thats getting most popular

comments?

Thanks guys.

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