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Old 12th March 2013, 08:20 PM   #11
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I started to redraw peeceebee according to components I have in my drawer and found out that BD139 has wrong orientation. It must be reverted.
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Old 12th March 2013, 10:21 PM   #12
shaan is offline shaan  India
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Indeed.

Pin orientation in TO126 devices like the BD pair is reversed from that of TO220 parts. So one needs to be careful, otherwise sharp clicks, chirps and pops will be heard.

Edit: in the silkscreen there are clear pin markers(c e for pnp vas and b c for npn vas) near the VAS bjts for avoidance of mistakes and to ease installation of either to126 or to220 parts, in case one opts for the latter.

Last edited by shaan; 12th March 2013 at 10:33 PM.
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Old 12th March 2013, 11:39 PM   #13
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This is first variant of my peeceebee. It needs some more refinements.
I'm not sure if I can find small enough electrolytics for 35V supplies.
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File Type: jpg VSSA Shaan 1.jpg (81.4 KB, 2084 views)
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Old 12th March 2013, 11:58 PM   #14
abetir is offline abetir  Philippines
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Nice work! Dobrivoje...

@ Shaan,
For ease of adjustment, is it possible to use v-trimmers in place of the offset resistors?

TY!
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Old 13th March 2013, 12:45 AM   #15
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Quote:
Originally Posted by abetir View Post
Nice work! Dobrivoje...
No, no, I was not clear enough. It's my variant of shaan's peeceebee. I just moved some components to get space for big input cap and heatsinks for VAS transistors. I also tried to place all components on one quarter of Euroformat (160 x 100 mm) PCB. I'm still not satisfied, some tracks are too long, some components not at right places and yet shaan's peeceebee is better.
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Old 13th March 2013, 01:02 AM   #16
naf is offline naf  Indonesia
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Nice dovibroje!, I think 100nf input filter is 100pf
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Old 13th March 2013, 07:06 AM   #17
shaan is offline shaan  India
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Quote:
Originally Posted by dobrivoje
my peeceebee.
Looks cool. Which software are you using? I ask becaus my stupid-a** pcb making program lacks many popular models, like TO247/264. Thanks.

Quote:
Originally Posted by abetir View Post
Shaan,
For ease of adjustment, is it possible to use v-trimmers in place of the offset resistors?

TY!
Of course. However, you wil need a 1Meg trimmer. Adding it to the board seemed to complicate the layout and increase board size by at least 10mm and demand two ugly jumpers. Aesthetix Lost.

It should be noted that without the off marked resistors it is possible to get an offset of less than 100mV. If this occurs then one only needs to connect a high value resistor(~220K) to either of the OFF marked spaces while keeping an eye on the millivoltmeter, this will ensure a very low and steady offset.

shaan
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Old 13th March 2013, 10:24 AM   #18
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@naf
You're right. It's 100p. My mistake.

@shaan
I use free drawing program Free Graphic Design Software – DrawPlus Starter Edition from Serif
It's not PCB software, it's plain drawing program.
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Old 13th March 2013, 01:05 PM   #19
shaan is offline shaan  India
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Thanx.
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Old 13th March 2013, 01:25 PM   #20
JMFahey is online now JMFahey  Argentina
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Quote:
Originally Posted by shaan View Post
Looks cool. Which software are you using? I ask becaus my stupid-a** pcb making program lacks many popular models, like TO247/264. Thanks.
You will have to draw the new shapes yourself, but that's easy
You must have some instruction called "library add" or similar.

To know what they expect, put a similar component you already have (say, TO220) on the PCB and "disassemble" it, there must be some command which "turns it into primitives", which are the separate elements that make the symbol: pads, tracks, holes, labels, etc.

You draw your own in a similar way (remember elements will be in different layers) , select them, and add it to a library with a new name.
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