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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 11th March 2016, 07:41 AM   #911
Krissz80 is offline Krissz80  Hungary
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Originally Posted by keantoken View Post
Remove the 10nF caps, in some circuits they are a last resort but are rarely optimal for a fast or low noise circuit. The BC337 should not age, if so then they have been abused.

The 100nF can actually cause oscillating by making a peak in the source impedance. I suggest instead you use Wima 10uF or Vishay MKP416 1uF. This will go much farther towards the goal of low ESR film bypass.

wima 10uf WIMA 10 uF 5 mm Film Capacitors | Mouser

10uF Wima parallel to each elko (100uF & 820uF)?
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Old 11th March 2016, 08:13 AM   #912
keantoken is offline keantoken  United States
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Yes.
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Old 11th March 2016, 08:46 AM   #913
Krissz80 is offline Krissz80  Hungary
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OK.

And what could cause that the drop of the K-multi increased.
With 14,2V with BD140 the output was 6,5V.
I've changed the BD to TIP42C, and the drop decreased, the output goes up to 10,7 V.
I've measured the BD140 after solder out, and it was good.

Now I've increased the input voltage, but don't knwo if it cause any problem.
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Old 14th March 2016, 02:38 AM   #914
alexkosha is offline alexkosha  United States
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Keantoken's CFP cap multiplier
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Good on ya'!!

I'd be interested.

//
I would be interested on several boards too, for 45V and 100V versions.
Any ETA on these?
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Old 14th March 2016, 04:34 AM   #915
keantoken is offline keantoken  United States
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Quote:
Originally Posted by Krissz80 View Post
OK.

And what could cause that the drop of the K-multi increased.
With 14,2V with BD140 the output was 6,5V.
I've changed the BD to TIP42C, and the drop decreased, the output goes up to 10,7 V.
I've measured the BD140 after solder out, and it was good.

Now I've increased the input voltage, but don't knwo if it cause any problem.
Sounds like your circuit is overloaded, or maybe Q1 has C and E swapped. Also check the 47R resistor with a DMM to make sure it's the right value.
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Old 14th March 2016, 04:40 AM   #916
keantoken is offline keantoken  United States
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Originally Posted by alexkosha View Post
I would be interested on several boards too, for 45V and 100V versions.
Any ETA on these?
I sent some of the 50V PCBs to print and they are at the fab right now. If they turn out well and test fine I can sell some as soon as I get them (could be 2 week or longer).

I will have to make a different PCB for the 100V version, but you could make one by soldering on a bunch of diodes on to the 50V PCB. How much input ripple would you expect?
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Old 14th March 2016, 04:45 AM   #917
alexkosha is offline alexkosha  United States
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Keantoken's CFP cap multiplier
About 300-500mV on input, the max. Need 1-10mV output from KM.


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Old 14th March 2016, 10:13 PM   #918
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
Interested in 4 boards
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Old 14th March 2016, 10:34 PM   #919
Ryssen is offline Ryssen  Sweden
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Interested in some boards,whats the price?
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Old 15th March 2016, 09:01 PM   #920
keantoken is offline keantoken  United States
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For now I'll say $4 per board plus shipping.
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