Revisiting some "old" ideas from 1970's - IPS, OPS

[jwilhelm]

They are easy to solder, but hard to see the orientation marking.

 

[thimios]

They are easy to solder, but hard to see the orientation marking.

Exactly!
Some electrolytic don't fit.
Are you sure for these C4,C7= 470uf/25v?

 

[jwilhelm]

Can you post a picture? I'm not in my office, so I'm not able to look at my boards.

 

[thimios]

Can you post a picture? I'm not in my office, so I'm not able to look at my boards.

Ok,i will post tomorrow,i haven't the board with me now.
Thanks.

 

[thimios]

Here is.
One that fit perfect is 100uf/25V
Other questions,is it necessary a heatsink for these 1381,3503 tran.for +/-50v power supply?
What is the values for R19 R21,C11,C14?

 

[jwilhelm]

I'm at the office now. I put 220uF there. These are just reservoir caps. They are fed from 1000uF caps in the supply, so the 100uF would likely be fine there.

 

[thimios]

I'm at the office now. I put 220uF there. These are just reservoir caps. They are fed from 1000uF caps in the supply, so the 100uF would likely be fine there.

Thanks Jeff , may be Valery can answer about non value components.

 

[jwilhelm]

Those components are for a nested feedback option. I left those positions empty in mine.

 

[jwilhelm]

You have Q3 - Q6 installed backwards.

 

[thimios]

You have Q3 - Q6 installed backwards.

Thanks Jeff,all these are unsoldered, i want to know about heatsink first.
If it's necessary putting heatsink,i will mount all on the heatsink and then i will solder all together.
In any case,Please moderators to delete this image to not give troubles to someone.

 

[jwilhelm]

All 6 need to be on heatsink.

 

[thimios]

All 6 need to be on heatsink.

Thanks,can a small heatsink do the work?

 

[jwilhelm]

Our usual sheet metal heat sinks are fine.

 

[vzaichenko]

Here is.
One that fit perfect is 100uf/25V
Other questions,is it necessary a heatsink for these 1381,3503 tran.for +/-50v power supply?
What is the values for R19 R21,C11,C14?

Hi Thimios,

Back to my PC.
100uF/25V will be fine - those are just local decoupling, the placeholders appeared to be smallish for 470uF.
R19 R21,C11,C14 - leave them unsoldered for the time being - they are reserved for nested feedback options.
Local heatsinks or aluminium plates are required for all the TO-126 transistors - they can be rather small, but they need to be there, just to allow some heat dissipation, ensuring stable VAS operating points.

All looks good so far!

Cheers,
Valery

 

[thimios]

Thanks guys,i will continue the work😉

 

[thimios]

A step farther...

I haven't something better,i hope that is enough😕

 

[jwilhelm]

That'll be fine.

 

[vzaichenko]

Yep - more than enough.

 

[thimios]

That'll be fine.

Yep - more than enough.

Thanks,at least one channel from this vz-x4 is complete.The other channel must be wait due to missing parts.
To all guys who didn't tried yet the smd montaz.
This is an easy process.
You must have a good solder iron,good quality thin solder wire and some experience.
More easy and faster than thru hole!
Try it!

 

[vzaichenko]

Parallel-LT - single side layout for etching

Continuing on the design, presented in Post #821, I have developed a diy-friendly layout of the "lite" version of Parallel amplifier (single output pair).

I can't test it myself - my lab is disassembled again - so, if somebody wants to try this cool creature - that would be great!

Nominal rails are +/-50V DC.

Cheers,
Valery