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Old 20th September 2005, 10:09 PM   #1
Nordic is offline Nordic  South Africa
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Default is 2x12v same as 24v

I asked for a 24V transformer but got one with 2 12V secondaries... i.e 2 poles each marked 0v and 12v...
Can I connect the 2 0v tabs to make a 24V transformer

Wil this give me a +24 and -24 rail (desregard rectification?)
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Old 20th September 2005, 11:20 PM   #2
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Two 12V AC windings connected in series with the right polarity will produce 24V AC (0V otherwise), but those 24V AC won't produce 24V DC when rectifified, they will produce almost 33V to 38V DC without load (1.4 or 1.5 times the AC voltage).
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Old 20th September 2005, 11:45 PM   #3
Nordic is offline Nordic  South Africa
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aiming for about 36V on + and on - rail, is this what I'll get?
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Old 20th September 2005, 11:51 PM   #4
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No, you will get a single 33 volt supply or a 16,5 volt symmetrical supply.
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Old 20th September 2005, 11:55 PM   #5
Nordic is offline Nordic  South Africa
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Thanks will exchange the unit tommorw, seems like too little juice for my gainclone then...
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Old 21st September 2005, 09:53 AM   #6
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2 x 18 to 2 x 24 V AC are normal voltages for a Gainclone. If you use LM3886 2 x 28 V AC is max.
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Old 21st September 2005, 10:16 AM   #7
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Quote:
Originally posted by peranders
If you use LM3886 2 x 28 V AC is max.
But don't drive 4 Ohm speakers to full throttle with this
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Old 21st September 2005, 10:28 AM   #8
Nordic is offline Nordic  South Africa
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Many thanks, the company offered me a refund, but now I will have to wait for transformers to be wound for me... I so wanted to hear what the amp would sound like today

Must also still source .1ufd 50v polyprop capacitors or can I use other types?
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Old 21st September 2005, 10:56 AM   #9
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Quote:
Originally posted by Nordic
Must also still source .1ufd 50v polyprop capacitors or can I use other types?
Of course you can use other types >= 50V (ceramic, film -- for decoupling?). I'm still not sure about this. Maybe a good 'lytic of 10µ..3000µ does the job, but check for oscillations. 0µ1 in addition is safer, but maybe sonically more difficult??
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