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Old 24th March 2004, 02:38 AM   #11
Aunkst is offline Aunkst  United States
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very well then. Thank you PD. I just ordered 3 of them. one for each channel (left, center, right). I'll post my progress...
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Old 24th March 2004, 07:08 PM   #12
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Question Dumb Question on Parts express Transformer

If Peter's assesment is right can I then use one of these transformers for each channel (use only a single secondary winding and leave the other one as is)? Will that get my enough current from a single secondary winding for a sngle channel. I can still use two transformers for a stereo gainclone then.

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vsr
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Old 24th March 2004, 07:17 PM   #13
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I wouldn't see a reason why one of those transformers wouldn't work per channel (it will even work for stereo amp). The only question is how much performance it offers at higher power (and current demands), but for normal use a single TX like this should be fine per channel.

You still need both secondaries (when powering one channel only) as the supply requirement is +/- V.
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Old 24th March 2004, 08:43 PM   #14
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Default Using both secondaries for a single channel

Probably a very basic question here -

How do I use two secondaries per channel with Brian's GC boards?

The power supply boards have a AC Hot and AC neutral per secondary.

How can I wire up two transformers with two secondaries each to this power supply board?

thanks
vsr
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Old 24th March 2004, 09:37 PM   #15
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What about paralleling secondaries and using 2 xfmrs, 1 for v+ and 1 for v-?. Saves me from having to get another PS pcb and more diodes.
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Old 24th March 2004, 09:40 PM   #16
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Please ignore previous post/didn't notice was actually a ct sec, not sep secs. What about wiring for 220 and running on 110 and not using ct?
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Old 24th March 2004, 10:00 PM   #17
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Hmm, I hope no one gets hurt putting these gainclones together..
Might be the one down side to these kits, it may just be too easy, for anyone to put one together.

As to wiring the transformer to your gainclone. power board. Lm3875ís need positive voltage and negative. As well as a reference ground. So this transformer is really perfect for that. You take one secondary and hook that to the AC1 and the other secondary and hook that to the AC2 the center tap will be your ground and that gets hooked to the N.

Do not attempt to wire your transformer for 220 on 110 or try doubling these up if you donít know what you are doing.
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Old 24th March 2004, 10:07 PM   #18
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Sorry if last post not clear. I was referring to using a separate xfmr for v+ and v-. By wiring for 220 and running on 110, should give a 20vct sec on each xfmr. By not using ct and wiring 1 xfmr to ac1 and the other xfmr to ac2. should give equivalent to 40vct xfmr. $10 is a lot cheaper than $42+.
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Old 24th March 2004, 10:09 PM   #19
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To take things a little further, if you wanted to use a separate transformer for each channel it looks like it would be pretty easy to change that dual bridge power PCB into a single bridge one and essentially have 2 rectifying circuits on each power board.

!* the following will only use the left side of the group buy power PCB*!
Hook up one secondary to AC1 and the other secondary to N, I would suggest leaving out the 4.7uf capacitor -V1 and -V2 will be your negative DC power rail, and Gnds will be your positive CD power rail. the center tap on the transformer will be your 0v or ground, just hook that wire to your umbilical or to the power ground on the lm3875 PCB
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Old 24th March 2004, 10:12 PM   #20
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Quote:
Originally posted by Lee35210
Sorry if last post not clear. I was referring to using a separate xfmr for v+ and v-. By wiring for 220 and running on 110, should give a 20vct sec on each xfmr. By not using ct and wiring 1 xfmr to ac1 and the other xfmr to ac2. should give equivalent to 40vct xfmr. $10 is a lot cheaper than $42+.
You will also cut your VA rating in 1/2 since the amperage that the transformer can pass will be the same, Just that you cut the voltage in 1/2.
Also there is just no need to do this since this one transformer has it all already, the only problem is that itís just a center tap and not dual secondaries, just jumper from one N connection to the other, on the power PCB to overcome this minor shortcoming.
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