Citation 12 complimentary Mosfet version PCB's

[kpsthakur]

Not able to find Kramskee...any chance to see the complementary mosfet schematic

 

[Tazzz]

Citation12

 

[kpsthakur]

Citation12

Thanks Tazzz, meanwhile, please check your PM

 

[schubert]

Check this thread - you should be able to find all you need here, including info on Kramskee's boards.

 

[kpsthakur]

Check this thread - you should be able to find all you need here, including info on Kramskee's boards.

Very detailed...thank you...next stop parts...

 

[schubert]

Are you modifying an old amp or making a new one?

 

[kpsthakur]

Completely new one...looks like I could find most of the part...interesting values for few...from the schematic...for R1 it reads as 18K use 2.2mA CRD...not sure what that could be...also Tazzz mentioned to use ccs diodes at input differential to avoid thumps while power on...till now I have use 1M resistors pulled to ground at the input..not sure what would that be...any insight or part numbers would be helpful

 

[Tazzz]

CRD = current regulation diode

It's to keep the input differential
biased and in controlled of the output until the rails are essentially depleted during turn off

Otherwise there is a large thump when the supply is slowly discharged

 

[schubert]

The part number from mouser for the CRD is given somewhere in the thread, I believe. If you can't find it I'll look for it when I get home. Tazzz's ccs diode is the same as the CRD. It does work, as my amps have no power-on or off thump.

 

[kpsthakur]

Thanks Tazzz, any part number I can refer to ...google did not lead me anywhere

 

[kpsthakur]

The part number from mouser for the CRD is given somewhere in the thread, I believe. If you can't find it I'll look for it when I get home. Tazzz's ccs diode is the same as the CRD. It does work, as my amps have no power-on thump.

Ok will run through the threads

 

[kpsthakur]

I was a big fan of HK, my first awesome desktop speakers...gifted it to my school, could never get the same quality ever again...I am sure this is a very different sounding amp...but this being their design ( some part of it at least), am happy to build one

 

[kpsthakur]

The part number from mouser for the CRD is given somewhere in the thread, I believe. If you can't find it I'll look for it when I get home. Tazzz's ccs diode is the same as the CRD. It does work, as my amps have no power-on or off thump.

Something like this?

1N5306 Central Semiconductor | Mouser India

 

[schubert]

yep that's it

 

[kpsthakur]

So basically I need to replace 18K (R1), with a 1N5306...because it will ensure constant current ... and stop the thumping business...ok

 

[schubert]

right again - leave the thumping to the drummers

 

[kpsthakur]

PCB’s arrived...thanks Tazzz ..now hunt for transistors starts...

 

[Tarasque]

Hi Tazz

Would you still have 8 pcb's for sale?

 

[Tazzz]

Sure I can arrange for more PCB's if there is interest.

 

[Tazzz]

I now have a few more PCB's for those interested in this lovely little amplifier.