djk said:
Hey djk,
Now that makes sense to me! I'm not the brightest bulb in the pack. . . especially
when you are an LED sitting between six 1000 Watt halogens. . .
so, the low rail would suck from one 45-0-45 transformer, while the second would suck from both in series?
Or stated another way, a single transformer with 45-0-45, 45-0-45 secondaries would
provide one channel with both the low rails and the high. . . Low rails sucking from one set
of secondaries, the high rails sucking from both in series?
Thank you so much!
Swagboy
high power
Go with chips, easier to build and less components, this amp uses LM3875's 4 chips parelled then bridged total 8 per channel at +/- 38VDC, for a 152VDC swing, 400+ watts
Go with chips, easier to build and less components, this amp uses LM3875's 4 chips parelled then bridged total 8 per channel at +/- 38VDC, for a 152VDC swing, 400+ watts
An externally hosted image should be here but it was not working when we last tested it.
high power
P.S. each chip is parellel there for see's the load directly 4ohm speaker each chip see's 4ohms. So each chip current shares output with all others, so each chip produces 56watts at 8ohms at a 76VDC swing times 4 for each leg of the bridge 224 watts then double the voltage swing from the other side of the bridge 448 watts continuous into 8ohms at .01 THD 5 to 35Khz. At a pulsed sine wave at 1Khz Ive tracked 812watts at 2ms intervals. Dynamic power is well over 450 watts.
No I would not have ever believed it myself until I set out to build one.
I first built a simple single chip amp, but not enough power for my use so I built one that was, actually 3 or 4.
P.S. each chip is parellel there for see's the load directly 4ohm speaker each chip see's 4ohms. So each chip current shares output with all others, so each chip produces 56watts at 8ohms at a 76VDC swing times 4 for each leg of the bridge 224 watts then double the voltage swing from the other side of the bridge 448 watts continuous into 8ohms at .01 THD 5 to 35Khz. At a pulsed sine wave at 1Khz Ive tracked 812watts at 2ms intervals. Dynamic power is well over 450 watts.
No I would not have ever believed it myself until I set out to build one.
I first built a simple single chip amp, but not enough power for my use so I built one that was, actually 3 or 4.
"trust me when I say this way to small amp out performs my Carvers both pro units and home I have a 4.0t, 1.5t and there PM counterparts, and the design can be up scaled to lager limits."
Thanks, I needed a good laugh.
I posted a gainclone design for 1.5KW using the LM3886 in suspended supply mode, do a search.
There are better ways of getting 1.5KW, that's what were are discussing.
Thanks, I needed a good laugh.
I posted a gainclone design for 1.5KW using the LM3886 in suspended supply mode, do a search.
There are better ways of getting 1.5KW, that's what were are discussing.
Close to up state NY, I will prove it 
Ive built amps for 20 some years now, and this chip amp design is by far the most dynamic, period! Better sound, deeper extension and more control. I would share the schematic but I would like to wait until I get the patent finalized.
Remember people told Edison the light bulb was impossible, hearing and seeing is believing.
P.S. by the way those are 635VA transformers that "little amp" can draw down the secoundary by 5 to 10VDC, it needs more transformer for solid RMS and dynamic power tests. By the way that is 1.33KW worth of supply. Granted that is for two channels
Ive built amps for 20 some years now, and this chip amp design is by far the most dynamic, period! Better sound, deeper extension and more control. I would share the schematic but I would like to wait until I get the patent finalized.
Remember people told Edison the light bulb was impossible, hearing and seeing is believing.
P.S. by the way those are 635VA transformers that "little amp" can draw down the secoundary by 5 to 10VDC, it needs more transformer for solid RMS and dynamic power tests. By the way that is 1.33KW worth of supply. Granted that is for two channels
Workhorse said:
Hey Workhorse,
Well, kinda slowed down a bit here. . . I have received two matching transformers for another project (30volt secondaries). I think I am going to experiment with them in the series configuration that has been suggested, to see if it will work. Other than that, It seems like the best thing to do is to go on to drawing up a prototype amp and let everybody help me fix it. . .
Is there a program for Macintosh cpus for doing circuit design? At least one that is inexpensive?
Thanks for all your help!
Failure to follow ones dreams is let eveyone else win, those who say you can't do things. The human spirit and imagination should not and cannot be dominated. Let's try to to do this one!
P.S. Will the plastic MJL21193/94's work for this project or do I need the To-3 metal ones?
Thanks!
Swagboy
A suspended supply is where the ground reference for the power supply for the front end amplifier is hooked to the main amplifier output.
A front end normally would have to swing the full rail-to-rail voltage on the output stages. You can use an opamp in suspended supply mode running on +/- 15V and drive the outputs from rail to rail.
A front end normally would have to swing the full rail-to-rail voltage on the output stages. You can use an opamp in suspended supply mode running on +/- 15V and drive the outputs from rail to rail.
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