[sdiy] Discrete Op Amps

[Magnus Danielson]

Hi,

On 04/09/2017 07:05 AM, cheater00 cheater00 wrote:
> Modern op amps might have better gbw, noise, etc, but older op amps
> (discrete or not) might have characteristics that you desire. For
> example, they might clip or sag in a specific way that is desirable. The
> thing is, that sort of thing is mostly inaudible on simple sounds - the
> more complex a sound the more "magic" you can work. So on the voice
> mixer - yes. On an instrument effect, mixer channel, etc. Last op amp of
> a synth voice, maybe. Vca, maybe. Op amp after filter, or in filter,
> maybe. Vco mixer before vcf is pushing it. Before that don't bother.
> There's a place for them and if your budget allows them, go wild.
> However most synths contain very many op amps so making them expensive
> could easily spiral out of control.

When you know that you want that particular sound, then it may be 
warranted, for most designs sufficient modern op-amps is the way to go, 
especially as you get started.

Cheers,
Magnus

>
> On Sat, 8 Apr 2017 13:31 Gordonjcp, <gordonjcp at gjcp.net
> <mailto:gordonjcp at gjcp.net>> wrote:
>
>     On Sat, Apr 08, 2017 at 05:45:35AM -0500, Elain Klopke wrote:
>     > Here's a question that's surprisingly not related to my Organ
>     Donor module
>     > project.
>     >
>     > Discrete op amps are kinda a big thing in recording electronics
>     DIY, but do
>     > they have a place in SynthDIY or are they best left for people making
>     > preamps, compressors, EQs, and mixers?
>
>     Under all possible circumstances - even preamps for the golden-eared
>     audiophools - discrete opamps will be outperformed in every respect
>     by even the cheapest shittiest IC.
>
>     You should read Rod Elliot's article on discrete opamps, and build
>     the circuit he suggests.  It won't perform well but it will give you
>     a much better understanding of how proper opamps work.
>
>     http://sound.whsites.net/project07.htm
>
>     --
>     Gordonjcp MM0YEQ
>
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