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Old 18th March 2003, 12:55 PM   #11
jcarr is offline jcarr  United States
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Circlotron,

>I am going to make a complementary symmetry buffer using an LM317 / LM337 combination<

I guessed that you would be doing this sooner or later.

Another fun challenge would be to make an all-regulator IC amplifier, but with a topology normally reserved for discrete devices. Differentials, current-mirrors, complementaries etc, with extra points awarded if the ICs used all have three pins each, and could visually pass for normal discrete transistors from a distance. It would be a hoot to see something that _looked_ like the output stage was comprised of a well-populated bank of metal-can TO-3 transistors.

humorously yours, jonathan carr
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Old 18th March 2003, 01:00 PM   #12
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Let's do some predictions. In a few weeks people will start
discussing the sound of different brands of 317s, used as
amplifiers, of course. In a few more weeks there will be a large
group of people who have built these 317 amps and love them,
provided that the PSU has discrete regulators.
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Old 18th March 2003, 01:11 PM   #13
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And don't forget to use Panasonic FC or Black Gate with your 317 / 337 !
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Old 18th March 2003, 02:50 PM   #14
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Default Graham-Clone ?

Quote:
Originally posted by Christer
Let's do some predictions. In a few weeks people will start
discussing the sound of different brands of 317s, used as
amplifiers, of course. In a few more weeks there will be a large
group of people who have built these 317 amps and love them,
provided that the PSU has discrete regulators.
Yes, but then Graham will come up with something even crazier and we will have to start over, and Peter will be out of business with his Gain-Clones !.

Keep drinking that strange Melbourne water Graham,
Regards, Eric.
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Old 19th March 2003, 01:03 AM   #15
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Quote:
Originally posted by Christer
Let's do some predictions. In a few weeks people will start
discussing the sound of different brands of 317s, used as
amplifiers, of course.
That's not so silly really. When several manufacturers all make the same nominal IC they rarely have identical internal circuitry. They are only more or less identical on the outside. So there is in fact scope for them to sound different. I used ST ones, just for the record.
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Old 19th March 2003, 01:10 AM   #16
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Quote:
Originally posted by jcarr
Another fun challenge would be to make an all-regulator IC amplifier, but with a topology normally reserved for discrete devices. Differentials, current-mirrors, complementaries etc. humorously yours, jonathan carr
Excellent idea! These would in fact make a red-hot differential amplifier. A current source tail is a piece of cake. Man, this is going to be fun. In actual fact I had thought about all the individual stages of a power amp using regs but it never occured to me to actually build a complete one.

/Circlotron - wonders whether people are genuinely technically interested, or just winding him up so he publicly makes a goose of himself (yet again...) so they can all have a bit of a giggle
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Old 19th March 2003, 02:38 AM   #17
Serow is offline Serow  Canada
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I always make a point to read your threads, no matter how wacky they may be - you have some great ideas!
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Old 19th March 2003, 07:32 AM   #18
e96mlo is offline e96mlo  Sweden
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This regulator concept is really cool!

Let us know when you get the complementary amp up and running.

/Marcus - wants to be creative like Circlotron
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Old 19th March 2003, 11:38 AM   #19
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Quote:
Originally posted by Circlotron

That's not so silly really. When several manufacturers all make the same nominal IC they rarely have identical internal circuitry. They are only more or less identical on the outside. So there is in fact scope for them to sound different. I used ST ones, just for the record.
I hope you didn't get me wrong. I didn't mean it would be silly
or that there wouldn't be any difference between brands. I
meant my post only as a benevolent joke about the trends
towards the non-obvious ideas that can be seen once in a
while here. For instance, most people frowned at the IC power
amps until the Gainclone fever started. Similarly, very few
people, if anybody, would expect a 317 to sound good as
an amplifier, but if you build one and find it does in fact sound
good, we might see a lot of people following up on this idea.

Keep on inventing all these non-standard designs. You might
strike gold one day. Of course, when I and other people (I hope)
call your ideas crazy, we mean that in a benevolent, positive
and encouraging way, but I am sure you take it that way.
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Old 20th March 2003, 01:10 AM   #20
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Quote:
Originally posted by Christer
Of course, when I and other people (I hope)
call your ideas crazy, we mean that in a benevolent, positive
and encouraging way, but I am sure you take it that way.
Of course! If anyone really was negative about what I have put up here then I expect they would be abusive and critical as well. The kind of thing you get all the time on Usenet. I don't mind at all if people poke good-natured fun at what I have done. I just write it down in my little black book and wait for another day. Bwuahahahahaha.
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