62-0-62 volt power transformer: options? - diyAudio
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Old 15th January 2015, 09:26 PM   #1
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Default 62-0-62 volt power transformer: options?

I have a rescued Yamaha M4 power transformer that has three secondaries: 62, 45, and 15 volts. The Yamaha circuit shows that the 62 volt secondaries were rectified to +/-80 volts. Is there a good amp design out there that I can cobble together so I can reuse this transformer? I've looked, and it seems that voltage is a bit high for most designs, and way too high for class A (my preference). A good class AB design would be nice. 50-100 wpc or so . . .

Thanks!

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Old 15th January 2015, 10:08 PM   #2
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I think the 62-0-62 volt taps are low current for an input stage. The 45-0-45 taps are the high current amplifier taps. That would give you 63 volt rails.
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Old 15th January 2015, 10:27 PM   #3
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yes. 62V taps are for the front end (0.5A fuses). 45V taps are for the output stage.
that will make it around 150W @8ohm amp.
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Old 15th January 2015, 10:37 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Yes. The 45-0-45 taps are the high current amplifier taps.
The 15V is fused at 1A and the 62V fused at 0.5A per rail.

I'd surmise the 80V rails are for the driver stage of a MOSFET
output stage *, allowing the unity gain output devices to get near
the main 63V rails under heavy current (and thus high [>10V]
voltage drive) conditions. I'm no MOSFET expert or fan,
take at look at Cordell probably for suitable circuits.

I'd surmise here also the single 15V derived voltage rail is for
driving the logic circuits, switching, protection, metering, etc.

rgds, sreten.

* Probably used for the input stage as well.
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Old 15th January 2015, 10:53 PM   #5
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Thanks, you're right, including the use of the low voltage rail having been used for switching and metering. I overlooked those 15000 uF caps, which should have clued me in.

Googling Cordell. Thanks!
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Old 15th January 2015, 10:59 PM   #6
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Here is a 150WRMS lateral mosfet amplifier.
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Old 16th January 2015, 02:08 PM   #7
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Thanks, Nigel. I assume that it's the design for the "classic" Maplin? It's okay to go with 63V electrolytics? I would have expected most builders would err on the side of 80V caps, though I imagine the 63V caps are designed for . . . 63V rails.

I'll take it into consideration, along with the ESP P101.
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Old 16th January 2015, 04:56 PM   #8
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you might want to try one of OPC's LME49830 with lateral mosfets.

the thread is here, and many have been built. You can bias the outputs at 1 amp or more depending on the rails voltage and heatsink size. OPC gives plots for different bias currents etc. I have built a stereo vesion and have had good results and I am very satisfied with the performance.

"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets
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Old 16th January 2015, 08:24 PM   #9
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Quote:
Originally Posted by soldersmoker View Post
Thanks, Nigel. I assume that it's the design for the "classic" Maplin? It's okay to go with 63V electrolytics? I would have expected most builders would err on the side of 80V caps, though I imagine the 63V caps are designed for . . . 63V rails.

I'll take it into consideration, along with the ESP P101.
Its runs off +/- 45 volts DC.
That gives about 125WRMS into 4 ohms.
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Old 17th January 2015, 01:14 PM   #10
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I was attempting to answer Multisync and lost my long reply due to an "expired token" while tapping on the damn iPad. Oh well. Essentially I was enthusiastically affirming that The Wire Amp looked like a great project for my needs.

Then I saw Andrew's response. Hmm. Perhaps I'll take the more expensive and surer route: Aleph J with hardware from the diyaudio.com store. I would love to build something more "scratch built," but yeah, I'm not ready for that yet. I sort of know my limitations.

Lots to learn, lots to spend.
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