15 years ago we discussed CarlosFM's theories about snubbers in power supplies. An user Joseph_K did measurements with a network analyzer with different kinds of capacitors in parallel. Anyone who remembers?
Real world measurements made by a network analyzer, excellent Joseph_K starting here:
http://www.diyaudio.com/forums/showthread.php?postid=548002#post548002
Where is the link these days? Gone?
Real world measurements made by a network analyzer, excellent Joseph_K starting here:
http://www.diyaudio.com/forums/showthread.php?postid=548002#post548002
Where is the link these days? Gone?
How about your thread?
http://www.diyaudio.com/forums/attachment.php?s=&postid=534018&stamp=1103139431
Above we see Carlosfm's power supply for Gainclones.
We see also that roibm have implemented these snubbers and they can be seen here.
Can anybody give a trustworthy explanation how they work and what they should eliminate?
Looking at the schematic above Carlos have a 100 nF in parallell of 1R+ 100nF. Does this make any sense? What would the 1 ohms resistor do? Why not 10 ohms or 2.2 ohms?
Above we see Carlosfm's power supply for Gainclones.
We see also that roibm have implemented these snubbers and they can be seen here.
Can anybody give a trustworthy explanation how they work and what they should eliminate?
Looking at the schematic above Carlos have a 100 nF in parallell of 1R+ 100nF. Does this make any sense? What would the 1 ohms resistor do? Why not 10 ohms or 2.2 ohms?
Gee, a search using the search term "snubber" and "By" member Joseph K returned all sorts of results that might be what you're looking for.
BTW, this can be easily simulated in the various SPICE programs if you know the ESL and ESR of the capacitors, the stray capacitance of the resistors, and have a good estimate of the inductance of the various leads and connecting wires. These can be measured with a good LCR meter.
Or, you could use something like a nanoVNA to measure the circuit itself. Power off, of course.
BTW, this can be easily simulated in the various SPICE programs if you know the ESL and ESR of the capacitors, the stray capacitance of the resistors, and have a good estimate of the inductance of the various leads and connecting wires. These can be measured with a good LCR meter.
Or, you could use something like a nanoVNA to measure the circuit itself. Power off, of course.
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