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Old 27th January 2005, 08:07 PM   #51
Bill F. is offline Bill F.  United States
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Default Back OT on the heat tip...

I'm planning some wintertime amps--a pair of SOZ-lites built into torchier lamps. I soothe my conscience thusly:

I'll go home this evening and turn on two 300W halogen lamps to light my living room. Those watts will be welcome guests in my home, as it will be many degrees below freezing outside tonight. Every watt in my house that doesn't come from electricity must come from my none-too-efficient NG furnace. And, reviewing my gas bill and the rising price of NG, I notice that the savings to be had there is shrinking.

Ergo my plan for a healthy SOZ with a bank of halogen projector bulbs for resistors--light, heat, and music on a winter's eve. Now that's what I call efficient.

/Bill/ believes entropy happens--but it's the journey that's important, not the destination.
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Old 28th January 2005, 01:36 AM   #52
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Waw, Epupa Epops is not pleased.

What did I do wrong to make him not pleased?
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Old 28th January 2005, 02:47 AM   #53
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Quote:
To Nelson : You have right, lower cascode is variable current source
The 7A floating current source is not used variably, but always steady at 7A, at all condition.
Yes, the higher voltage at folded cascode/VAS will be usefull. I also forgot to draw gate stopper resistors.
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Old 28th January 2005, 07:05 AM   #54
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Default Perhaps OT to the main thread...

Quote:
Originally posted by Bill F.
Every watt in my house that doesn't come from electricity must come from my none-too-efficient NG furnace.
Don't forget that typical thermal power station efficiency is about 40%, and by the time it goes through many transformers and miles of wires to get to you, the efficiency is down to about 30% or so. Even a lousy gas furnace can generally get 60% efficiency, really good ones over 90%. So if you only want heat, make it where you want to use it with NG. Or better still, have a co-generation setup where the waste heat from the generator engine warms the house while the electricity makes music.
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Old 28th January 2005, 11:14 AM   #55
Bill F. is offline Bill F.  United States
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You killjoy.
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Old 28th January 2005, 07:20 PM   #56
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Quote:
Originally posted by Upupa Epops
Nelson, I like Mosfets the same as you like - I know, how works this devices - solution is easy, little bit higher + rail voltage on VAS .
That's how we do it on X600 and X1000's. Works like glue on
a folded cascode.

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Old 8th June 2006, 11:44 AM   #57
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Quote:
Originally posted by lumanauw
...
The finals are mosfets (NP said for mosfets suitable for hot operation), cascoded 5V by bipolars, and around each final there is floating 7A current source.
The bias section (which I learn from "Smart Bias" patent) don' use VBE multiplier biasing scheme, but rather bias is determined by T1, and this T1 is put in heatsink for thermal compensation.
...
Did you end up building something along these lines?
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Old 8th June 2006, 12:29 PM   #58
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There's an amp using LU1014, small smps(s).
The cores are small, only to give 5V of 5A max, but there's more than 1 of these smps in one channel amp. What amp could it be?
I only make for my personal use, it's IP belongs to Nelson Pass.
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Old 8th June 2006, 12:47 PM   #59
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Sue, Sue !
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