1500VA...what do do?

Stocker · 25th March 2004, 01:22 PM

I have a 1500VA transformer laying about that can deliver 50, 55, or 62 VAC depending on how it's wired (no center tap). I am not a fan of big hardware for a single channel (Pass designs) because of the size. So classA in general is pretty much out... but what else would you do? build a 5.1 integrated amp for a whole system? a house-destroying sub-amp? a 3-way stereo+sub amp? Would you make it discrete or all chip amps, or a combination of them?

Looking for ideas. Think outside the box. Winner receives a

sreten · 25th March 2004, 02:22 PM

Triamped stereo set up.

AC coupled mid and treble, possibly class A or enriched AB.

Bridged bass amps to get rid of the coupling capacitors.

Use 50V (bridged) for bass, 62V tap for midrange, 55V tap for treble.

sreten.

UrSv · 25th March 2004, 02:42 PM

Design a virtual ground circuit to keep the rectified voltage divided to two rails and the use it for whatever you fancy with 2*33-44 VDC?

Didn't QUAD do that in for instance the 405?

http://home.jps.net/~shiloh/

moamps · 25th March 2004, 02:51 PM

Quote:

Originally posted by UrSv
Didn't QUAD do that in for instance the 405?
[/B]

Hi,

IMHO, no.

regards

Stocker · 25th March 2004, 03:08 PM

Quote:

Originally posted by sreten

Use 50V (bridged) for bass, 62V tap for midrange, 55V tap for treble.

sreten.

Never thought of that! Out of curiosity, why not use the 62V bridged for bass? Seems to me you want as high a rail as you can get for mo' power...

Anyhow, great idea.

It occurs to me that this is the perfect start for a VERY small subwoofer using ESP's P48 sub processor and P68, high power variant, bridged.

UrSv · 25th March 2004, 03:15 PM

Quote:

Originally posted by moamps

Hi,

IMHO, no.

regards

Seems not. Maybe somebody else then...

sreten · 25th March 2004, 09:02 PM

Quote:

Originally posted by Stocker

Never thought of that! Out of curiosity, why not use the 62V bridged for bass? Seems to me you want as high a rail as you can get for mo' power...

Just trying to balance powers a bit, 50v bridged = 100V.

Assuming 8 ohm :

50V only would give ~ 100w bass : 25W mid : 25W treble.

using taps = ~ 100w bass : 38W mid : 30W treble.

Of course its far more complicated than the above,
different driver sensitivities and impedances etc.

sreten.

slowhands · 28th March 2004, 05:57 AM

Use a FW voltage doubler for +-95v rails. hang 2-3 300 wpc amps on it.

25th March 2004, 01:22 PM	#1
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	1500VA...what do do? I have a 1500VA transformer laying about that can deliver 50, 55, or 62 VAC depending on how it's wired (no center tap). I am not a fan of big hardware for a single channel (Pass designs) because of the size. So classA in general is pretty much out... but what else would you do? build a 5.1 integrated amp for a whole system? a house-destroying sub-amp? a 3-way stereo+sub amp? Would you make it discrete or all chip amps, or a combination of them? Looking for ideas. Think outside the box. Winner receives a __________________ Jesus loves you.

25th March 2004, 02:42 PM	#3
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	Design a virtual ground circuit to keep the rectified voltage divided to two rails and the use it for whatever you fancy with 2*33-44 VDC? Didn't QUAD do that in for instance the 405? http://home.jps.net/~shiloh/ __________________ UrSv Those who say it can't be done should not stop those who are doing it.

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25th March 2004, 02:22 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Triamped stereo set up. AC coupled mid and treble, possibly class A or enriched AB. Bridged bass amps to get rid of the coupling capacitors. Use 50V (bridged) for bass, 62V tap for midrange, 55V tap for treble. sreten.

28th March 2004, 05:57 AM	#8
slowhands diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	Use a FW voltage doubler for +-95v rails. hang 2-3 300 wpc amps on it.

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