[sdiy] headphone driver for synths

cheater cheater cheater00social at gmail.com
Thu Sep 9 01:37:03 CEST 2021


Is the distortion really appreciable on a single instrument that you
can't use a transistor stage?

On Wed, Sep 8, 2021 at 10:30 PM Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Yes the OPA1678 has a higher drive current than the 5532, but using both of the pair of a 5532 in parallel works out cheaper than half a OPA1678 per channel provided you don’t mind the 4 times quiescent current (2* per opamp and 2 opamps).
>
> Noise and distortion are very similar, and far below what is audible.
>
>
>
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Martin Klang
> Sent: 08 September 2021 17:49
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] headphone driver for synths
>
>
>
>
>
> What about just using an op amp with higher current capabilities, like
>
> TS922: Rail-to-rail input and output, Low noise: 9 nV/√Hz, High output current: 80 mA (able to drive 32 Ω loads)
>
> or for split rails maybe the OPA2990?
>
> For line level outputs that should also cope with headphones (as opposed to dedicated hp outs) I've been using OPA1678 which I think can output 50mA. Have I been doin' it wrong?
>
>
>
> Martin
>
>
>
> On 08/09/2021 15:07, Mike Bryant wrote:
>
> You can trace that design back to at least Wireless World's around 1974, probably a bit earlier.
>
>
>
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