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Old 5th May 2012, 08:17 AM   #1121
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5deg c. in Oslo today,
Forecast says snow the next days

Greece is my solution for winter depression
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Old 14th May 2012, 09:11 AM   #1122
Luke is offline Luke  New Zealand
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Im about to order some parts, but I am looking at BL grade 2sk117, will this matter or is it a must to use the lower Idss parts?
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Old 14th May 2012, 09:13 AM   #1123
Salas is offline Salas  Greece
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It matters, better use GR.
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Old 14th May 2012, 10:21 AM   #1124
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Thanks Salas, I need to find some then.
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Old 15th May 2012, 11:55 AM   #1125
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Thanks Salas, I need to find some then.
If you don't find ask Tea-Bag
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Old 18th May 2012, 06:03 PM   #1126
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Extracted from BiB guide Rev.2:

"You could use instead a Zener based configuration. Will give a fixed low drift voltage setting. Add R303 220R 1/4W to aid noise filtering, jumper the LEDs and the trimmer positions. Use 220uF C302 50V. Not an MKT. Zeners need more filtering. There will be additional 0.6V from Q304 Vbe and R303's Voltage drop. VR303=R303*IQ303. Factor in the extra voltages. Q303 JFET will be weaker for IDSS in circuit from what you had measured with a 9V battery. A circa 4mA IDSS 9V testing JFET gives you around 3mA. If you still want keep the LEDs for indication, they will be adding their Vf too as in the first example. The higher the target Vout the more reliable a Zener reference is for low drift VS a resistor reference."

My question is: wich is the minimum high target Vout to use Zener? Zener 0.5W wich voltage? If trimmer is jumped how adjust the Vout? I ask because I'm doing regs. for 30 Vout.

Last edited by merlin el mago; 18th May 2012 at 06:09 PM.
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Old 18th May 2012, 06:23 PM   #1127
Salas is offline Salas  Greece
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The Zener option is for those choosing to avoid a trimmer. You should think of adding the Leds voltage, 1.3V from Vbe and drop on a 220R at Zener's tail, plus the Zener voltage itself to know VoutTotal.
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Old 18th May 2012, 06:38 PM   #1128
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Sorry for my English, I don't understand you very well, could you elaborate?
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Old 18th May 2012, 07:16 PM   #1129
qusp is offline qusp  Australia
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the zener is noisier, but has a fixed voltage that is possible to be higher and possibly more stable than the largest possible total of the series LEDs on the board, so you can avoid the trimmer.

so for your total add the 1.3v drop from vbe + total drop from the LEDs + the drop from the 220r on the zeners tail for the total reference voltage

is that about right salas?
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Old 18th May 2012, 07:41 PM   #1130
Salas is offline Salas  Greece
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Yes, only that 1.3V represents the Vbe AND the 220R drop.
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