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Old 24th March 2008, 08:22 PM   #11
miklos is offline miklos  Hungary
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Old 24th March 2008, 08:23 PM   #12
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Old 24th March 2008, 08:25 PM   #13
miklos is offline miklos  Hungary
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Here's the PDF file of the PA46;
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Old 24th March 2008, 08:28 PM   #14
peranders is offline peranders  Sweden
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Apex power op amps
Nice work

Unusual looks of the toroid transformer.
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Old 24th March 2008, 08:29 PM   #15
miklos is offline miklos  Hungary
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My friend ,who gave me the chips made one amp with the PA45's for O.Peterson. He liked it very much. I think this is an excellent sounding amp and it is easy to build.
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Old 24th March 2008, 08:33 PM   #16
miklos is offline miklos  Hungary
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Thanks. Almost everything is in this amp coming from surplus.
Except the input connectors and the knobs.
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Old 24th March 2008, 09:12 PM   #17
redrabbit is offline redrabbit  Isle of Man
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I thrive on surplus stuff.
I only order from Digikey once a year.

We have a large CNC at work, for wood and aluminum....6 foot by 12 foot. I wonder if it can do small pcb's ??

I have some 3oz copper board.

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Old 25th March 2008, 07:19 AM   #18
felixx is offline felixx  Romania
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Very nice,but tell a few words about the influence of the transformer (strayfield effect) to the chips.
Because of the poor distance from toroid to pcb maybe you have some "noise" on your speaker?
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Old 25th March 2008, 03:55 PM   #19
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The noise is 1mV RMS, I can hear it if I holding my ear close to the speaker. The speaker is a diy 2 way Audax ,HM170G0 woofer ans a tiny TW010P1 HF driver.
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Old 21st April 2010, 06:14 PM   #20
redrabbit is offline redrabbit  Isle of Man
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Finished the PA12 amp.
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