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Hi all. On page 383 of Bob's book he talks about film type snubber capacitors. I was just wondering are tantalum capacitor ok to use or are film type capacitors better. If so please provide a explanation and details so I can understand.
Thanks.
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Thanks.
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Hey Stu, snubber caps are best metalised film or film foil with low resistive losses. At the mains frequency the relatively high Xc protects the snubber resistor from too much continuous current and at the much higher secondary resonance frequencies the much lower impedance allows the resistor to dissipate all the ringing energy. For a short time the resonant current could be quite high so the cap needs to have a reasonable pulse current rating.
Capacitors with an X or Y rating for direct connection to mains are very reliable for connection across transformer secondary, are readily available and fairly low cost although they are fairly large.
See RS Stock No. 869-7469
This is 250Vac, 100n X2 with pitch of 15mm
Cheers
John
Capacitors with an X or Y rating for direct connection to mains are very reliable for connection across transformer secondary, are readily available and fairly low cost although they are fairly large.
See RS Stock No. 869-7469
This is 250Vac, 100n X2 with pitch of 15mm
Cheers
John
I read a bit of that thread awhile ago I will re vist it and look into this further. However I fine it very puzzling that nobody can offer a single part number of a snubber capacitor that they have actual used in an actual amplifier build....
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I used this exact capacitor in a CRC snubber connected across the transformer secondary, of an actual amplifier build. Carefully note: the capacitor was NOT connected in parallel with a diode; it was connected in parallel with the transformer secondary. This particular capacitor was mentioned by name in the Quasimodo design note, shown below.
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Just wondering if there is any update on when the 2nd edition of Bob's book will be available for purchase....
Its been delayed significantly because I am in the middle of down-sizing from my house into a town home. Probably looking at sometime in 2018.
Cheers,
Bob
Understood. I know what that feels like. I am in the midst of moving the family from London to Miami and having to do a stint in New Zealand while my immigration visa is processed.
As a guy stuck with balanced sources I'm still hoping the second edition devotes space to fully balanced input stages etc so I can save the space required by my implementation of Self's balanced to single-ended input board....
As a guy stuck with balanced sources I'm still hoping the second edition devotes space to fully balanced input stages etc so I can save the space required by my implementation of Self's balanced to single-ended input board....
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