Just another current feedback amplifier

[BucketInABucket]

FFT, 2Vrms@1kHz into 32R. Quite happy with this! Hopefully I can do justice with my PCB...

 

[BucketInABucket]

Also, square wave performance at 20kHz with 2u rise/fall times. There's ~19mV of overshoot but overall pretty well-behaved.

 

[BucketInABucket]

PCB on the way...

 

[BucketInABucket]

And it's done! Now to build one...

 

[Extreme_Boky]

Very nice work.

 

[BucketInABucket]

Thank you! I revised it as I'd actually accidentally flipped the symbol for the D45H11 in the schematic...

 

[BucketInABucket]

Should mention too that I separated the VAS and input stages from the output stage with a capacitance multiplier using one dual BJT per rail. Should give me lots of PSRR rejection! I also changed the DC servo opamp to an ADA4522-1.

 

[BucketInABucket]

Also, the circuit works with mosfets too, at least in simulation. I'll definitely have to play around with the boards once I get the built, but SPICE shows no issues so far.

 

[ElArte]

Can it drive the crazy Hifiman he6? 🤪

 

[BucketInABucket]

No clue but in theory it has enough grunt to do so!

I've got boards and parts on the way so will update when I've built the amp...

 

[Guerilla]

What is an IPS?
CHEERS!

 

[BucketInABucket]

InPut Stage

 

[ElArte]

No clue but in theory it has enough grunt to do so!

I've got boards and parts on the way so will update when I've built the amp...

Keep me posted.

It's a bit of a legendary abomination that can generate a 404-page thread all on its own.

https://www.head-fi.org/threads/amp...ifiman-he-6-planar-headphones.529873/page-380

I drive mine with a power amp equipped with a L-pad.

 

[BucketInABucket]

Oh dear, I've no idea if mine is capable then, that seems very intense. I don't own a HE-6 so I can't test it with one either.

 

[chakaandgeorgie]

How is the build coming along?

 

[BucketInABucket]

I got the boards sent to my home country to avoid VAT (along with the parts for it) but haven't received them as a result, I'm this close to just getting another set of boards done ahah

 

[izerotwo]

Damn that looks really impressive and complex. Can't wait to hear how the project goes!

 

[chakaandgeorgie]

Any results yet

 

[passive420]

Very nice design, would BC850/860 replace the extinct Toshiba BJTs? Same pins.

 

[BucketInABucket]

I originally designed it for BC8x7 so it'll work with some modifying of values

Any results yet

Finally have some time on my hands after 1st semester uni finals so I'll start work on building these and seeing how they work