ZAP filter

[nFORCE]

Dear all,

Does anyone have this circuit? ZAP filter

Regards,
nFORCE

 

[tbla]

http://www.lcaudio.dk/zfdia.pdf
😎

 

[nFORCE]

Thanks alot.

Still one more question.
What is the setting of the jumper in the schematic?

Regards,
nFORCE

 

[OliverD]

The jumpers are there to set the circuit up for voltage or current input and balanced / unbalanced mode.

There is a new version of the ZAP filter with simplified schematic... Have a look at the big CD upgrading PDF brochure, you'll find a schematic in there.

I did a PCB for this circuit... But until now I wasn't able to identify the transistors they use... Picture quality is not good enough, no info in the schematic. I'm using BC550 / BC560 for a first "proof of concept" prototype.

The circuit looks promising, single ended class A, balanced and DC-coupled 🙂

 

[nFORCE]

Dear Sir,

Can you send the circuit to me (updated circuit)

Thanks alot

please mailing to :
50140834@alumni.cityu.edu.hk

The jumpers are there to set the circuit up for voltage or current input and balanced / unbalanced mode.

There is a new version of the ZAP filter with simplified schematic... Have a look at the big CD upgrading PDF brochure, you'll find a schematic in there.

I did a PCB for this circuit... But until now I wasn't able to identify the transistors they use... Picture quality is not good enough, no info in the schematic. I'm using BC550 / BC560 for a first "proof of concept" prototype.

The circuit looks promising, single ended class A, balanced and DC-coupled 🙂

 

[OliverD]

The brochure is too big for most mailboxes, you can download it from the link below. See page 17. Text is danish, but the schematic speaks for itself. Missing: the shunt regulators and (optional) DC servos. Those are pretty much the same as in the first ZAP filter version and can be used unmodified. I simulated it that way and it seemed to work.

http://www.lcaudio.dk/opgrmat.pdf

Please let me know if you are successful using this circuit in one of your projects.