Sijosae Hybrid Scematic and part list?

[sbelyo]

I thought I would tackle this amp to see how it sounds. Does anyone have a parts list that they used succesfully along with a straight forward schematic? I would be running it from a single 24V source. Any links or info would be great from those who have built it.

 

[eastside504]

http://headwize.com/ubb/showpage.php?fnum=3&tid=5395

Look at page six for the latest schematic. I use parts that i had lying around or from radioshack. I had to order the tube and tubesocket (mini 9 pin ) from http://www.tubesandmore.com.

 

[sbelyo]

I found that one. I was just confused about where V+ and V- goes when running from wall supply only with no batteries. And the schematic also has two 1000uf caps for each side of the tube, and everyones amp shows only three total for both sides.

At the end of the day once I get a grasp of the schematic I want to make a pcb for it.

I just need a walkthrough or once over basically.

 

[Nisbeth]

The batteries are optional. If you don't want to use them, just connect the wires instead (there's a picture in the headwize thread somewhere which shows how sijosae just jumpered the connections on the pcb). As for the cap question, one of the caps is for the PSU and common for both channels. See the simplified schematic here http://www6.head-fi.org/forums/attac...achmentid=4862 , then it makes sense

/U.

 

[jerb]

i sent you an email, it has the parts list in it

read the artical on headwize, there are lots of different versions of it with some being harder than others

 

[sbelyo]

Quote:

Originally Posted by jerb i sent you an email, it has the parts list in it read the artical on headwize, there are lots of different versions of it with some being harder than others

Thanks

I got them.... It puts me in the right direction.

 

[sbelyo]

Quote:

Originally Posted by Nisbeth The batteries are optional. If you don't want to use them, just connect the wires instead (there's a picture in the headwize thread somewhere which shows how sijosae just jumpered the connections on the pcb). As for the cap question, one of the caps is for the PSU and common for both channels. See the simplified schematic here http://www6.head-fi.org/forums/attac...achmentid=4862 , then it makes sense /U.

That's the one I am looking for....

so +V goes to the common cap for power and -V goes to VR1 and VR2 ?

 

[sbelyo]

Okay after looking at the schematic and the etched board layout V- is tied to ground

Am I correct?

 

[CedMan]

Hey jerb, can you send me the part list as well? I was trying to do the same thing and run into same issues ... I'm such a newbie ... hehe

Thanks!

young.cedric@rogers.com

 

[sbelyo]

I'm working on an excel spreadsheet of the parts right now. It should be ready once I find all the parts that fit correctly together.

Also a professionaly made pcb once I breadboard the amp a few times and work out the bugs.

 

[sbelyo]

sijosae has released a new revision today!!

 

[Secret Squirrel]

It looks like Headwize is down again. I went to sijosae's website and looked at the new schematic for Version 2. I would like to know if there are any other options for the E-701 (0.60ma to 0.92 ma) I have 1N5299 from Central Semiconductor and it goes from 1.08 ma to 1.32 ma. Would this be too high of a current range?

 

[sbelyo]

He replyed to my same question on headwize. He said the part wasn't critical and said that a generic jfet would do.

I am considering buying the e-701 from the manufacturer. The minimum order is 100 pieces for $70.00

 

[Secret Squirrel]

I tried 1N5298 and measured the voltage. It is approximately 23 volts with a supply of 24 volts. My understanding is that it should be 0.7* supply voltage. Is this too high? Also, how do you adjust the 2.2 K trimmers?

 

[sbelyo]

I've made a schematic that sijosae says is correct. I removed all the letters and replaced them with the actual pin numbers of the tube. I also included the pinout of the tube. The e-701 CRD is a current regulator diode. Mouser has 2 replacements that will work in this situation.