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Diode Speed

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2007-2009 » Archive through 17 June, 2008 » Circuit fails when power gradually drops » Diode Speed « Previous Next »

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hot_anode
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Username: hot_anode

Post Number: 7
Registered: 12-2007

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Posted on Thursday, 12 June, 2008 - 07:33 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Fast diodes have switching times of 4 to 300ns but I cannot find the switching times of standard diodes such as 1N4007, also what is the switching time of selenium rectifiers as used in old radio invertors?
Mechanical vibrators have a significant off time, is it necessary to replicate this when a semi-conductor vibrator replacement is used?
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zeitghost
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Username: zeitghost

Post Number: 1163
Registered: 01-2006

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Posted on Friday, 13 June, 2008 - 08:39 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I doubt if the switching speed of selenium rectifiers was anything to write home about, the distributed capacitance must have been enormous.

When I replaced a vibrator in a car radio, I just used silicon rectifiers, probably BY100 way back then, and it appeared to work ok.

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