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Old 10th April 2013, 10:12 AM   #191
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I just figured it out we can use a single layout for zener or zenerless builds if transistor is going to be base-to-ground. I'm working on layout.
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Old 10th April 2013, 10:24 AM   #192
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Quote:
Originally Posted by terranigma View Post
I just figured it out we can use a single layout for zener or zenerless builds if transistor is going to be base-to-ground. I'm working on layout.
Hero!
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Old 10th April 2013, 05:50 PM   #193
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Hi everyone!

I still change my circuit design but I have a little doubt tracks two tracks that pass between the two capacitors, any suggestion is welcome.

For Schottky diodes (D4 and D5) I have SB560 (60v - 5A).
http://www.vishay.com/docs/88721/88721.pdf
It is ok?

Regards!
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File Type: png Circlophone_rev2.png (137.5 KB, 135 views)
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Old 10th April 2013, 06:58 PM   #194
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Quote:
Originally Posted by Project16 View Post
Hi everyone!

I still change my circuit design but I have a little doubt tracks two tracks that pass between the two capacitors, any suggestion is welcome.
Did you check the whole circuit? R22 seems an extra resistor that doesn't exist on original circuit.

Last edited by terranigma; 10th April 2013 at 07:01 PM.
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Old 10th April 2013, 07:18 PM   #195
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Quote:
Originally Posted by terranigma View Post
Did you check the whole circuit? R22 seems an extra resistor that doesn't exist on original circuit.
I added R22 to possibly get two 2ohms 1/4w resistors (R8 => 1ohms - 1/2w) but I will certainly remove it to remain in the original scheme.

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Old 10th April 2013, 10:06 PM   #196
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Default Layout updates

Changes :

* It is now Transistor/Zener option on same layout
* Some resistors laid down at input stage
* R21 pads thickened due to possible two pin CCS small module card insertion

Note: 25-50V per rail voltage range is a theoretical estimation.
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File Type: jpg With-Zener.jpg (27.3 KB, 124 views)
File Type: jpg With-TR.jpg (105.0 KB, 117 views)

Last edited by terranigma; 10th April 2013 at 10:13 PM.
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Old 10th April 2013, 11:26 PM   #197
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A choice. Nice! Good features there.

Just a note:
Darlington 25~35v or FET 25~50v
It seems like plans and high voltage parts for FET are getting into the Darlington board. I don't know. Does the one board do both?
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Old 11th April 2013, 08:32 AM   #198
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Quote:
Originally Posted by danielwritesbac View Post
A choice. Nice! Good features there.

Just a note:
Darlington 25~35v or FET 25~50v
It seems like plans and high voltage parts for FET are getting into the Darlington board. I don't know. Does the one board do both?
In this board minimum Vce spec'ed part is at 120V. So, I didn't bother to show 50V there. It is going to be the same as mosfet version - except 120R's and output stage of course.

I haven't arranged a BC/2N version of PCB yet. In this case, supply margin will be limited by BC5X0C's at max 38-40V.

I don't want to limit the builders. I just want to prepare a template for different possibilities and requirements. BC/2N version should be applicable for mosfet version too. Hope you get my idea.

I arranged 180pf/270R comp network for transistor version and I didn't altered for zener version as shown in original schematic. Simulation doesn't show any difference with this setup. Should I re-arrange the comp. for zeners (270R to the other side of zeners) as shown in original schematic? It is very easy. Elvee?

Last edited by terranigma; 11th April 2013 at 09:00 AM.
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Old 11th April 2013, 02:34 PM   #199
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Quote:
Originally Posted by terranigma View Post
I arranged 180pf/270R comp network for transistor version and I didn't altered for zener version as shown in original schematic. Simulation doesn't show any difference with this setup. Should I re-arrange the comp. for zeners (270R to the other side of zeners) as shown in original schematic? It is very easy. Elvee?
It is completely equivalent: the zeners dynamic resistance when they conduct connects the two nodes in AC
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Old 12th April 2013, 03:08 PM   #200
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Quote:
Originally Posted by danielwritesbac View Post
[Posted to main thread]
Given the 30+30vdc (60v) operating voltage and unregulated power (surges happen) we might need to list something other than BC556B (maxed at 60V) in the sensor area.
Sorry for late correction but, BC5X6 series specified with -+65V max Vce.

BTW, PCB layout versions seem ready and I'm a bit uncertain about how to introduce them within a clear and understandable way.

* There is going to be physically different 2 versions: BC-2N small transistor type and Japanese small transistor type

* Each pcb can be applicable for Darlington and Mosfet output preference

* Each pcb can be applicable for Zener or Zenerless (+Extra Servo transistor) preference

* Output devices can be N(PN) or P(NP) type

* Remaining active parts and supply polarity must have adapted according to output device type and Sensor/VAS device preference

So, instead of showing a specific transistor type on layout, I think we must categorize each section and provide a list of suitable devices for each section

For example:

PNP Servo(VAS) : Philips,Harris BD140 (Vs<=37V), TTA004,....
NPN Servo(VAS) : Philips,Harris BD139 (Vs<=37V), 2SC5171-FLIPPED,...

PNP IN (BC/2N): BC560C (Vs<=40V),...
NPN IN (BC/2N):

PNP Input (Japanese): 2SA970-BL, 2SA992,...
NPN Input (Japanese):

and goes on...

Last edited by terranigma; 12th April 2013 at 03:10 PM.
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