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Old 26th July 2011, 10:21 AM   #191
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Quote:
Originally Posted by ostripper View Post
2 X 300Va standard 38-0-38v E-waste trafos (or new ones). 1 X 600-800Va / 40-0-40V unit , either choice will require a soft start. 2$ "el cheapo" will do(below 1+2). Started the above PS 100's of times -- works real nice , can use the trafo ac direct or the 68V positive rail to activate.

Will share PCB , if needed.

OS
Thanks for your work on this new amp ostripper. I am waiting on a blank pcb to arrive before I start.
Could you please supply the pcb details to make the soft start thanks?

Regards

Simon
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Old 26th July 2011, 10:53 AM   #192
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Originally Posted by Josip_Del View Post
I can get hold of (original so they say) 2SA1380/2SC3502? What say you this for VAS?
Wonderful , low Cob , just a slightly lower Vce (200) ... but at 60V rails , all is good.

http://www.datasheetcatalog.org/data..._e/2SC3502.pdf

A-OK!

OS
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Old 26th July 2011, 11:46 AM   #193
sonnya is offline sonnya  Denmark
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Just to let you know. If you are going to need any of the:

KSC3503ESTU
KSA1381ESTU

I have ordered 5760 pcs each.

They were ordered the 13. july and there is 8 weeks delivery time on them.
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Old 26th July 2011, 12:01 PM   #194
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Originally Posted by sonnya View Post
Just to let you know. If you are going to need any of the:

KSC3503ESTU
KSA1381ESTU

I have ordered 5760 pcs each.

They were ordered the 13. july and there is 8 weeks delivery time on them.
5760 of each? Thats quite a lot.

I got 4 of each as samples for my own amplifier project but could use some more down the line, interested in selling a few?
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Old 26th July 2011, 12:04 PM   #195
sonnya is offline sonnya  Denmark
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Yes i would be interrested.

I need to buy that much, because in september you will only be able to get them in two different HFE classification.....

And the MOQ is 5760 each.
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Old 26th July 2011, 07:23 PM   #196
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Quote:
Originally Posted by sonnya View Post
Just to let you know. If you are going to need any of the:

KSC3503ESTU
KSA1381ESTU

I have ordered 5760 pcs each.

They were ordered the 13. july and there is 8 weeks delivery time on them.
Thats a lot of devices , leave some in the world for the rest of us.

The E's are good , But the F's are what you should shoot for. Most of my F's
have 275+ beta. These devices are used for the deflection in CRO's (H+V) ..
precision linear amps - instrumentation preferred devices.

The only performance differences between the 2 gain groups might be a little faster slew and less load on the "enhancer" in the VAS.

OS
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Old 26th July 2011, 07:36 PM   #197
sonnya is offline sonnya  Denmark
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I could not order less...

I think other companies does not care, if they want them
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Old 26th July 2011, 08:19 PM   #198
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Originally Posted by niss_man View Post
Thanks for your work on this new amp ostripper. I am waiting on a blank pcb to arrive before I start.
Could you please supply the pcb details to make the soft start thanks?

Regards

Simon
Here ya are , full S4 "super simple soft start" (I have 2 working , made the first 2years ago) 50mm X75 (below) , any junk microwave oven single pole relay will work.

Whole "package" below ... S4.zip...
If you want the power supplies , too - I have the "6pac" (external 35A bridge) and the "4pac"( snubbered 10 A flatpack bridge). Both built and working nice. 6pac is good for 1 big PS , 4 pac's are good for dual mono.
OS
Attached Images
File Type: gif S4_overview.GIF (11.4 KB, 1821 views)
Attached Files
File Type: zip S4.zip (66.3 KB, 455 views)
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Last edited by ostripper; 26th July 2011 at 08:31 PM.
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Old 27th July 2011, 01:09 AM   #199
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Originally Posted by ostripper View Post
Here ya are , full S4 "super simple soft start" (I have 2 working , made the first 2years ago) 50mm X75 (below) , any junk microwave oven single pole relay will work.

Whole "package" below ... S4.zip...
If you want the power supplies , too - I have the "6pac" (external 35A bridge) and the "4pac"( snubbered 10 A flatpack bridge). Both built and working nice. 6pac is good for 1 big PS , 4 pac's are good for dual mono.
OS
Your too good Os. I was going to attempt to build a 1kw smps for the supply but if that doesn't work out will go traditional tranny and caps method. If you want to share your 6pac and 4pac versions with myself and the community I certainly wouldn't say no. Always handy to have that data stored on the computer to help with the next project.

A big thank you for your help in advance to your reply.

Regards

Simon
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Old 27th July 2011, 05:12 AM   #200
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Default 6PAC - proven simple PS

Here is the "6pac" (below)
full package (below- attached)

-better than the EBAY ones
- true star ground
- takes the APEX JR. panasonic or Samwha 2-3$ cap's- (22mm LS 4 pin) AND 10mm snap-ins.
- built 10 of these for my "bar-room" ebay amps.
-SUPER durable...
-100mm X 150mm.... not much bigger than the 6 caps themselves. 2 would fit a dual- mono setup for 100Kuf. (overkill)

"4PAC" is next ... my "test"PS and a smaller package (10mm snap-ins - 75mm X 100mm total) these are good to get rid of all your "loose" (extra) caps.

Enjoy...

OS
Attached Images
File Type: gif 6PAC_overview.GIF (31.2 KB, 1762 views)
Attached Files
File Type: zip 6PAC_PS.zip (121.6 KB, 400 views)
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