[sdiy] headphone driver for synths

Roman Sowa modular at go2.pl
Wed Aug 25 09:42:38 CEST 2021


Has anyone ever tried to explore this not-so-new idea of using opamp's 
supply currents to drive boosting transistors?
Schematics attached.

Roman

W dniu 2021-08-25 o 01:49, ulfur hansson via Synth-diy pisze:
> you all are amazing, thanks so much for the info!!
> 
> sent from outer space
> 
>> On 24 Aug 2021, at 23:19, Vinicius Brazil via Synth-diy 
>> <synth-diy at synth-diy.org> wrote:
>>
>> 
>> +1 with bd139/140
>>
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>>
>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>
>> On Tue, Aug 24, 2021 at 7:29 PM Brian Willoughby 
>> <brianw at audiobanshee.com <mailto:brianw at audiobanshee.com>> wrote:
>>
>>     Looking inside gear that I've owned over the years, I have seen
>>     plenty of purpose-designed headphone amplifier chips. I've never
>>     designed with them or looked at the pricing, so they might not be
>>     the best choice for all situations, but they certainly have plenty
>>     of power and the data sheet example circuits will certainly be
>>     aimed at driving headphone loads.
>>
>>     Brian
>>
>>
>>     On Aug 24, 2021, at 09:49, ulfur hansson via Synth-diy
>>     <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>>     > hello all!
>>     >
>>     > i've been getting mixed results for a few yeara using standard
>>     opamp circuits to drive headphones for my projects. oscillations
>>     randomly seem to occur, noise issues that disappear if i use nice
>>     outboard preamp etc...
>>     >
>>     > is there a more juicy/capable solution anyone can think of? THAT
>>     corp line drivers? discrete transistor drivers?
>>     >
>>     > any thoughts would be greatly appreciated :)
>>     > -ulfur
>>
>>
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