simple boost schem?

Talk about music gear for noise music

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MKULTRA
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Post by MKULTRA » Tue Feb 07, 2017 11:21 am

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Last edited by MKULTRA on Wed Aug 22, 2018 2:53 am, edited 2 times in total.

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crochambeau
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Post by crochambeau » Tue Feb 07, 2017 2:18 pm

Agreed on the 4558, I have a TOA mixer that is populated with those. When I was more foolish I was thinking about "upgrading them" (I was going through my audiophile phase, long story) but I'm really glad I didn't. It's got a solid footprint that most efficient modern method stuff doesn't touch.

I've built discrete operational amplifiers. I'm looking at one right now, it has nine BJTs, 12 diodes (sometimes these are employed as diode connected BJT on the chip), two caps, and fourteen resistors. It's a simple one....

...but not as simple as the booster schematic I linked earlier.

Which, granted, is not nearly as simple as an LPB1 or other Common Emitter Amplifier.

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xdugef
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Post by xdugef » Mon Feb 20, 2017 6:45 am

MKULTRA wrote:I understand where you are coming from and inclined to agree for some applications. But I think that is a bit beyond a simple boost.( Where does the buffer come into play btw?)

Op amps can yield satisfaction. Start fiddling around with the feedback and B+ rail to find your comfort or fidelity zone. The old MXR Micro Amp is still a favorite of mine.

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xdugef
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Post by xdugef » Mon Feb 20, 2017 6:46 am

MKULTRA wrote:I recall someone building discrete op-amps.......................

I have a thing for JRC4558s. No voodoo or mojo implied just early builds I did with them sounded great. I cannibalize those when and where I find them in salvage door stops. Allen Bradley carbon comps, voodoo/mojo implied, probably contributed a great deal. Solid core wire, etc. et al............... But yeah, op-amps are cheating a bit I suppose. I do stand by uprated and upgraded components with high B+ in an OD-1 for sonic fidelity.

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