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In the Forum: Melquiades Amplifier
In the Thread: 6 Channel Version of Super Melquiades
Post Subject: The Usual SnubPosted by hagtech on: 1/8/2008
Snubbers are more effective when there is no inductor - just a diode/capacitor rectification.  That's when they become useful.  To snub out the ringing caused by leakage inductance.  Keeps the "buzz" from coupling to other areas of the circuit.

With the inductive input, a snubber in the wrong place will add current spikes through ground where you may not want them.  I'll put a snubber across the secondary sometimes.  But like you say, it's not good to mess with the induction.  We want that smoothing effect. 

I have the same glitch on several of my supplies.  My answer so far is to put a small RC on the primary side.  It is to keep the higher bandwidth components of the glitch from heading back out the line.  Works both ways, as I get an RC filter on any RF hash on the ac line coming in.  With higher powered gear, the R ends up too small.  But in something like my headphone amp, I get 44 ohms and 0.01uF.  It does three things, 1) drop line voltage from 120V to 115V (transformer runs much better), 2) gives me a low pass filter of 360kHz, 3) reduces the glitch energy pushed back onto the ac line.



jh

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