12 - 24V Pre-regulated supply from 35V rails - Page 2

davidlzimmer · 3rd December 2006, 01:56 PM

I'm wondering about power up. I hope this won't require a delay for the power amp. Using the batteries, I power up the op amp first then the power amp.

Will be interested in your findings Monday.

This could really be a sweet solution for a lot of projects that I have day dreamed about, but tossed off thinking I'd have to build a separate supply.

Nordic · 3rd December 2006, 04:58 PM

Lol you should have asked, I made a relay board to use with this as well....

Nordic · 3rd December 2006, 05:08 PM

and a picture

davidlzimmer · 4th December 2006, 12:28 AM

OK wise guy.

What program do I need to open a .sch file?

Eagle?

Nordic · 4th December 2006, 04:14 AM

correct

Nordic · 4th December 2006, 08:55 AM

While it is quiet, you could use the relay board with a 12V supply by bypassing the big resistor where the power conects through... it is currently set to operate off 30V. I.e. from the positive and negative rails from the prereg-reg board. (which prevents loading one rail more than the other)

Alternatively you could use larger voltages or voltages in between, by adjusting the resistor.

Nordic · 4th December 2006, 01:34 PM

Sorry, was unable to do promised testing today thanks to RS, once again screwing up... been like a running battle with them since Thursday.

davidlzimmer · 4th December 2006, 02:39 PM

No problem. I'm in no hurry. Was given an old sub amp yesterday so, I'm mainly interested in this for future projects.

Have had an itch to build an integrated amp. This will be a sweet solution for powering the pre.

Nordic · 4th December 2006, 02:49 PM

I'd be interested in the crossover/filter you did for the sub, I have a dead Yahamaha here which the woofer still works fine in, it is only a 100W.

davidlzimmer · 4th December 2006, 03:00 PM

This was submitted by some one months ago. It works just fine for what little testing I gave it. I just used two 10K resistors to sum the input which was taped from the input vol control of the mains amp.

I would imagine a couple of buffers for summing and a stage for a little gain would really improve the performance.

But for what it's worth, here it is.

3rd December 2006, 01:56 PM	#11
davidlzimmer diyAudio Member Join Date: Jan 2006 Location: Fairmount, GA	I'm wondering about power up. I hope this won't require a delay for the power amp. Using the batteries, I power up the op amp first then the power amp. Will be interested in your findings Monday. This could really be a sweet solution for a lot of projects that I have day dreamed about, but tossed off thinking I'd have to build a separate supply. __________________ Poor stereo mix? Switch to mono! Perfect.

4th December 2006, 12:28 AM	#14
davidlzimmer diyAudio Member Join Date: Jan 2006 Location: Fairmount, GA	OK wise guy. What program do I need to open a .sch file? Eagle? __________________ Poor stereo mix? Switch to mono! Perfect.

4th December 2006, 02:39 PM	#18
davidlzimmer diyAudio Member Join Date: Jan 2006 Location: Fairmount, GA	No problem. I'm in no hurry. Was given an old sub amp yesterday so, I'm mainly interested in this for future projects. Have had an itch to build an integrated amp. This will be a sweet solution for powering the pre. __________________ Poor stereo mix? Switch to mono! Perfect.

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4th December 2006, 04:14 AM	#15
Nordic diyAudio Member Join Date: Sep 2005	correct

4th December 2006, 08:55 AM	#16
Nordic diyAudio Member Join Date: Sep 2005	While it is quiet, you could use the relay board with a 12V supply by bypassing the big resistor where the power conects through... it is currently set to operate off 30V. I.e. from the positive and negative rails from the prereg-reg board. (which prevents loading one rail more than the other) Alternatively you could use larger voltages or voltages in between, by adjusting the resistor.

4th December 2006, 01:34 PM	#17
Nordic diyAudio Member Join Date: Sep 2005	Sorry, was unable to do promised testing today thanks to RS, once again screwing up... been like a running battle with them since Thursday.

4th December 2006, 02:49 PM	#19
Nordic diyAudio Member Join Date: Sep 2005	I'd be interested in the crossover/filter you did for the sub, I have a dead Yahamaha here which the woofer still works fine in, it is only a 100W.

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