These humble old guys function quite well with good caps right on the chip supply pins. Requires a better supply than just basic 3 pin regulators, tho.
PCB, I want one1
Huh, PASS boards, whatt?, I'm up? Sure would like to get in on this build:Email Colin! Looks like an early morning FAX machine hunt! on your mark' .....
Charles Keller
Huh, PASS boards, whatt?, I'm up? Sure would like to get in on this build:Email Colin! Looks like an early morning FAX machine hunt! on your mark' .....
Charles Keller
5532 supply caps
Hi Oneday,
They seem to like having really good electros right next to the chips plus the bipass caps - one across the +/- rails and an R&C snubber from each rail to power gnd. Pretty standard, but often neglected.
How's the Monica/Rudolf/B1 NOS dac build going?
Hi Oneday,
They seem to like having really good electros right next to the chips plus the bipass caps - one across the +/- rails and an R&C snubber from each rail to power gnd. Pretty standard, but often neglected.
How's the Monica/Rudolf/B1 NOS dac build going?
With simple circuits like the B1 buffer what is the reason for using opamps over discrete components?
labjr said:
Because that's what it shows in the manufacturer's application notes.
In the early 70's I designed a cute common-base moving coil preamp.
"You obviously don't know how to hook up a transistor!", they said.
If John Curl's mc stage hadn't been potted, they probably would have
said the same thing.
When I did the no-feedback common-gate I/V converter for the D1,
I showed it to several (then successful) companies that made DACs.
"That Can't Work!", they said. All their op amp I/V's were straight
out of the app notes.
When the RCA transistor manual was issued in the 60's, it showed a
nice little quasi-complementary power amp design. The Citation 12
came out and had the identical circuit. Bob Carver built a bigger
version, and it was years before designers stopped copying the
original RCA.
And that's why they still use output coils, sez I 😉
Nelson Pass said:
and that's why they still don't use Vertical mosfets ;
they aren't good for audio .
Nelson Pass said:
I'm surprised they doubted your idea with the D1. After all it wasn't the first time you challenged the status quo.
BTW, I thought Bob Carver was a guru with the magnetic field amplifiers and all.
I recall the nickname "Flame Linear". This was in the days before
power transistors with good "second breakdown" specs came out.
😎
power transistors with good "second breakdown" specs came out.
😎
I remember my college buddy bought a Carver in the mid 80's. Wasn't long before the amp had a humming from one of the channels and the techs didn't know how to fix it. He still has the Carver and it still hums. At least it's consistent.😀
phase linear and bob carver
fond memories of the mid seventies- I was there and I can remember them-somewhat
the pro sound setup we had for my colledge was a tapco mixer with a phase linear amp over lascalla speakers- loud as hell and terrible sounding- highs that could rip your ears off-
sadly i bought a mac 275 for the monitors-
i think the sound on stage was WAY better than what i subjected the audiences to-
unfortunealy I was in the middle of the audience with my sound board-
la vie
rob
fond memories of the mid seventies- I was there and I can remember them-somewhat
the pro sound setup we had for my colledge was a tapco mixer with a phase linear amp over lascalla speakers- loud as hell and terrible sounding- highs that could rip your ears off-
sadly i bought a mac 275 for the monitors-
i think the sound on stage was WAY better than what i subjected the audiences to-
unfortunealy I was in the middle of the audience with my sound board-
la vie
rob
Nelson Pass said:
I remember Phase Linear when loud was in. Tech Hifi used to sell it in Boston area. I worked on a fair amount of it years ago. Cheapo parts inside.
I was being sarcastic with the guru remark. I've always thought everything associated with Bob Carver with was inferior. A glut of patents for the smoke & mirrors and lots of marketing, but failed to impress audiophiles.
I consider Bose the same but maybe a step up.