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Old 18th March 2011, 04:32 PM   #11
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the toroids do give 2 x 30v and i do whant to use them.
i bought it all together as a set from someone who did not have the time to finish the project.
so if it is possible to use the, then i would like to know how to lower the bias.
i am using the pcb from KK.
you can use your toroids. no problem. the design is for 2x28V transformer.
use a CRC psu and 0.5-1ohm resistors 25W. and your down to ~+/-34V.
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Old 18th March 2011, 04:38 PM   #12
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And/or rewind the toroids to drop the secondaries voltage a little.
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Old 18th March 2011, 05:14 PM   #13
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And/or rewind the toroids to drop the secondaries voltage a little.
that's waist of time or money, when you can use resistors with higher value insted
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Old 18th March 2011, 05:16 PM   #14
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thank you Audiosan, i whill try your advise.

rewinding the toroids is not a option in my case, thy are enclossed, but thanks for the idea Jacco.
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Old 18th March 2011, 05:21 PM   #15
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Keep it in mind for the next one.

The ones you have seem perfect for the job, skipping a CRC or CLC would be a shame.
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Old 18th March 2011, 05:54 PM   #16
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i bought a nearly complete set from a man here in holland who did not have time for it anymore. it whas with pain in hiss heart he sold the set. only thing i mis is the dale 453 ohm.
the toroids where his choice. tiny problem, but i think i'll be a lucky man when i am finnished.
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Old 18th March 2011, 05:57 PM   #17
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i have 4 resistors, 1,5 ohm 25W and 4 1.8mH coils. shall i put al of them in?
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Old 18th March 2011, 06:05 PM   #18
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i have 4 resistors, 1,5 ohm 25W and 4 1.8mH coils. shall i put al of them in?
no. try just the resistors. you will get ca +/-38V. and thats OK.
it will drop a bit with a load.
and heatsink the resistors in the end. they will get a little hot
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Old 18th March 2011, 06:53 PM   #19
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okay, i whill try that next monday.
alas, this weekend i do not have the time to go to my workshop.

i whill also make some pictures.
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Old 18th March 2011, 07:04 PM   #20
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please do its allways nice to see a aleph
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