Hello,
I'm just starting on my first DIY build, a PSU for my naim preamp and I have a newbie PS transformer question.
I'd like to feed my preamp with 2x 24v rails and the design I am emulating, uses a single transformer with dual centre tapped secondaries.
A cheaper alternative would be for me to get two regular off the shelf transformers and have each one feed one rectifier each before each rail is then smoothed and regulated like above.
I from my limited understanding I think I can wire a 2x ??v transformer (in series?) to emulate a centre tapped V-0-V.
My question then is in order to get a 24v-0-24v output, would I need a 2x 12v transformer or a 2x 24v transformer?
I've looked at this diagram but am confused as to which voltage transformer I need.
Many thanks 🙂
I'm just starting on my first DIY build, a PSU for my naim preamp and I have a newbie PS transformer question.
I'd like to feed my preamp with 2x 24v rails and the design I am emulating, uses a single transformer with dual centre tapped secondaries.
A cheaper alternative would be for me to get two regular off the shelf transformers and have each one feed one rectifier each before each rail is then smoothed and regulated like above.
I from my limited understanding I think I can wire a 2x ??v transformer (in series?) to emulate a centre tapped V-0-V.
My question then is in order to get a 24v-0-24v output, would I need a 2x 12v transformer or a 2x 24v transformer?
I've looked at this diagram but am confused as to which voltage transformer I need.
Many thanks 🙂
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The answer to the question is a 2x 24V transformer.
A schematic of your circuit and power requirements of your preamp would be helpful to provide more specific info.
Thanks Sofaspud. I'm struggling trying to understand transformers so haven't gotten very far yet. Maybe I phrased my question incorrectly as a result. I'm looking for 24v in at each rectifier to give about 34v out going into the regulators (superteddyregs) with a voltage drop back down to around 24v going into the preamp. I'd like to use only half the bridge rectifier (only two diodes) and get full wave rectification like in the diagram.
Afaik the preamp only pulls around 10 or 20ma per rail.
I am a little confused by why joining 2 12v secondaries in series gets you 24v (according to the diagram) but centre tapping doesn't... If that has cleared anything up is it definitely 2x 24v transformers I need?
Cheers,
Afaik the preamp only pulls around 10 or 20ma per rail.
I am a little confused by why joining 2 12v secondaries in series gets you 24v (according to the diagram) but centre tapping doesn't... If that has cleared anything up is it definitely 2x 24v transformers I need?
Cheers,
Im confused too. Your preamp needs 24-0-24 regulated?
In that case you get 48v centertap with 4 diodes. Its either that or 2 24v secondaries with each secondary needing 4 diodes.
http://www.williamson-labs.com/images/pwr-supply-dual-307.gif
In that case you get 48v centertap with 4 diodes. Its either that or 2 24v secondaries with each secondary needing 4 diodes.
http://www.williamson-labs.com/images/pwr-supply-dual-307.gif
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