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Recent content by NigthMoth

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    LM311 comparator input from Colpitts oscillator questions

    Hello all I was studying how to use comparators, so decided to feed LM311P comparator with 10kHz sinusoidal waveform generated by Colpitts oscillator to confirm the comparator behaviour. But (as you've probably already guessed) LM311P didn't behave as I expected (and Colpitts oscillator as...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Hello Thank you for clarifying! Now Im getting this output: 1) 10:1 probe (Probe 3) - Without capacitor across output of power supply: Spike 2.67Vpp. Ripple 0.122Vpp; - With 47nF capacitor actoss output of power supply: No spike. Ripple 0.260Vpp 2) Capacitor probe (Probe 1) - Without...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Thank you for reply. Sorry for bothering and sorry if asking you to tell me same thing but in other words, but can you please look at next few pictures and confirm is this wat you meant? 1) As for 10:1 probe, here is picture of what i have used (reffered as "Probe 3" in my previous post). Is...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Hello All! At last I’m able to share results of re-testing of this noname wallplug adapter. I used seven different setups and different self-made probes, so hope it can be interesting to somebody (at least it was interesting for me). Taking into account advices from cupoftea (reply #10)...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Hello all! Taking into account recommendations from cupofftea and D.A.(Tony)Stewart, I have ordered some BNC coaxial cable, and I will post an update to this thread in few days (after receive it and asemble coaxial probe).
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Thank you for reply I have some questions regarding your comments: 1) GND connection: do you mean GND connection of the oscilloscope probe? 2) Actual output: Can I think about protoboard "red" and "blue" rails as it is output of one assembled "Wallplug+wire+protoboard circuity + protoboard...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Thank you for comment. Yes, I'm aware that protoboards are noisy and long wires also adding noise (anyway this particular wallplug designed with 1.2 meter wire). And I agree that this circuit will be useless if i want to know exact values of actual noise/ripple voltage. But I'm much more...
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Thank you for reply. Here is picture of circuit I had assembled and tested (and, nfortunately, it looks like it was star wiring)
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    Ripple voltage measuring: confusion with using of capacitor along with oscilloscope probe

    Hello all! I have some questions regarding usage of filter capacitor along with oscilloscope probe to measure voltage ripple, that is described as correct ripple measurement method in this aticle (above Figure 5) : How do you reduce voltage ripple? My questions at the end of this post...
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    Thank you for your detailed answer and for your time spent analysing and explaining simulation result. Regarding circuit damage - sorry for misunderstanding - it is absolutely not your fault! I have burned it long time ago - just before starting this thread, long before you posted here. I mean...
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    While waiting for reply from mtwieg i also have some questions/comments regarding your analysis: 1) As for C4 capacitor. Can you please explain why do you call it "Speedup cap" and what is its role according to your understanding? As for me, I personally treating C4 (and C3) as "Slow down...
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    Thanks for your commenting on this type of converters and for the advice regarding fuse board, caxial probe and diff probe, i definetly will try to make it. This converter power output is 30W.
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    I have tried to simulate this circuit with a load and yes, You are right: indeed there is current through D6 and output capacitor's voltage became dependt on coils winding ratio. A simple answer after many days of solving this puzzle... now i know that load is necessary to account during...
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    Hello all It is second part of this post. At last I was able to simulate this flyback converter with Micro-Cap 12 and was able to finish my “theoretical” calculation attempt (with help of GNU Octave). It looks like it solved question regarding enormous output ripple from my previous post...
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    Flyback converter “reverse engineering” questions: How to calculate ripple Vpp? Why it exploded?

    Thank you! very clear explaination
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