I totally agree with tomb   What's the point of having a $1500 headphone with a simple opamp and a 9v battery ?   CMoy and so on... i respect the believe, but from an electronic standpoint, it's not what you're looking for. For such a headphone, you should consider, at least :  ...

Hi !   it's just for DIY , i like to be complicated ... :( the whole amplifyer is with solid state power supply (linear, low caps, no inductor, overcurrent protected) automatic synchro of start and stop auto tuning of the EL34 tube bias ...   if this can be usefull for someone ...

here is the amp i designed, i measured with scope and function generator, signal is perfect even at 100 Khz !  

hi   yes it changes beause it is not well used ! these types of OP amp are not designed to directly drive these loads, that's why the sound changes between amps .   you can't possibly use a led driver to drive a motor... here there is no power stage,   here is a good output stage ...

the OPA 2227 THD is 0.00005% !!!!! could you ear the distortions of the bass ??

the cmoy is not a good amp. That's my point of view.  

suppressed....

Hi all,   i made a tube amp (push pull EL34, with 12AUX preamp ) and i wanna present one of the electronics i concieved for :   I made many cards, one of them is a high voltage power supply, low power, for the preamp part of the amp (not the high voltage for EL34), here are the...

hi, can't find the part "m5216" or "NJM5216", is the ref correct ?   Anyway the opamp like JRC 4565 is just an opamp, not a poweramp !   what is the impedance of your headphones ?

Hi guys !   I'm really surprised to see your replies concerning the op amps !!   could someone describe the setup ?  signal source (with THD)  headphone used  impedance and THD of the headphone.     why ? because i see that this op amp is bad, this one is marvelous... am i...