[sdiy] headphone driver for synths

Roman Sowa modular at go2.pl
Sun Aug 29 07:56:54 CEST 2021

There is no extra current in any pins of the opamp, why whould they blow?
Even at step input drive, the transistor will start pumping more current 
only after the opam's own output transistor is already doing it, so the 
current wil flow to the load, not back to opamp's output. And even if it 
did, there's nothing that can take sink down to negative supply more 
than normal standalone operation.


W dniu 2021-08-28 o 19:05, Michael E Caloroso pisze:
> My bigger concern is the tiny wires between the substrate and the
> pins.  Too much current on the opamp output and they blow open like a
> fuse.
> And with today's shrinking design rules for substrate, they can't
> dissipate much power.
> MC
> On 8/27/21, Brian Willoughby <brianw at audiobanshee.com> wrote:
>> On Aug 25, 2021, at 00:42, Roman Sowa <modular at go2.pl> wrote:
>>> Has anyone ever tried to explore this not-so-new idea of using opamp's
>>> supply currents to drive boosting transistors?
>>> Schematics attached.
>>> Roman

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