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Old 10th December 2012, 03:27 PM   #441
tinitus is offline tinitus  Europe
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Thanks Kean, great you are here
that its possible to make it do what I want is all I need to know...for now
the work continues

glad you like my drawing
I do it to make it more 'compact', in the first place
and in the process I try to make it easier for myself to 'understand'
its like when its 'easy on your eyes', its also gets easier to 'read it'
may sound weird, but its kind of like a balance between empty space and components
often I try 3 or 4 different variations of various connections, sometimes more
may seem a bit stupid, and waste of time
but at the of the day I know every single component
I dont know the function of each component, but I will know where it should be mounted
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Old 10th December 2012, 03:40 PM   #442
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I always try to use neat but compact schematics in the simulator. Compact because it has to share half the screen with the waveform viewer. So most of my schematics have a "widescreen" form factor. I think there should be a way to dimension the most common schematic symbols so they will naturally come together gracefully. I think LTSpice has struck a reasonable balance on this.
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Old 10th December 2012, 07:10 PM   #443
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Quote:
Originally Posted by keantoken View Post
Use the schematic in the webpage. It is much newer, and less likely to fail.

I would still put snubbers on the input and output, and this applies for any regulator really.
ok chief
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Old 10th December 2012, 07:30 PM   #444
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The 3 diodes are in series. I suppose I should clarify that.
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Old 10th December 2012, 07:45 PM   #445
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ah, yes, makes sense
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Old 10th December 2012, 08:35 PM   #446
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corrected
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Old 10th December 2012, 09:01 PM   #447
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Wait, that doesn't make sense. The Kmultiplier will just step down the input voltage by 1.8V. If you need 12V output you need a regulator.
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Old 10th December 2012, 09:20 PM   #448
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on the bright side, at least it will work for the +30V

for the 12V, how about shunt zener diodes

or, somewhere I have a simple curcuit
a single transistor placed before a reg, to lower a too high source voltage
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Old 10th December 2012, 09:51 PM   #449
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is this a ok pre reg ?

found on a German site, called Livingnote's DIY Pages
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Old 10th December 2012, 09:57 PM   #450
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You can replace the top two diodes with a 3.3k resistor, and add a 12V zener + diode from the 3rd diode anode to ground. Then you will have 12V output without any extra transistors.

But then the circuit will be limited to 130mA max at 2W dissipation. The output transistor will need a heatsink if you need more.

However, the Kmultiplier isn't better than the chipregs in all ways. It is faster and has more PSRR above 10KHz, less output impedance at 100KHz. But at 120Hz it will have less PSRR. The Kmultiplier is intended for applications that don't require a regulator but that can still benefit from a low-impedance rail.
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