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Old 6th June 2012, 08:30 PM   #5101
Salas is offline Salas  Greece
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Cuts a lot of base current and worsens spec.
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Old 6th June 2012, 08:34 PM   #5102
Salas is offline Salas  Greece
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Mosfet has almost no gate current but more capacitance so it needs higher gate stopper to bring the two versions in comparable Bode open loop gain plot for zero point phase margin. Its good it worked for you in a completely different layout also. No worries about the old blocking part, I do worse mistakes all the time. Regards.
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Old 7th June 2012, 03:34 PM   #5103
agussug is offline agussug  Indonesia
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My Regulator based on Salas Shunt Regulator

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Regards
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Old 7th June 2012, 04:31 PM   #5104
Salas is offline Salas  Greece
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What are the differences? Just custom layout?
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Old 7th June 2012, 11:15 PM   #5105
agussug is offline agussug  Indonesia
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Quote:
Originally Posted by Salas View Post
What are the differences? Just custom layout?
Yes, just custom layout for PCB. Thank you very much for the schematic. It's sound wonderful.

regards
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Old 8th July 2012, 02:36 PM   #5106
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Funny stuff here... My 4 salas shunts seemed to be working correctly.... However one of them has a problem: the bc547 gets really hot and eventually burns (after several hours)

Specs:
Bib version, but on my own pcb, using irf610 for ccs and irf620 for shunt
Vout=15v
Vin=25v
Ccs=130mA
Iload=50mA tda1541a

Any ideas?

The other 3 regs on the board (5v, -5v, 3.6v) all work fine
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Old 8th July 2012, 02:46 PM   #5107
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Could you post a pic?
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Old 8th July 2012, 02:55 PM   #5108
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Click the image to open in full size.
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Old 8th July 2012, 02:56 PM   #5109
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Better one with all components side & the other one with all solder junctions.
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Old 8th July 2012, 03:05 PM   #5110
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How's this?
Note that there are positions for some caps which are not used. Also I have connected the collector of the BC547 (depicted on the picture as BC550) to GNDplane. For the rest this is accurate.

Screen shot 2012-07-08 at 5.03.07 PM.png
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