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-   -   8 diode bridge rectifier? (https://www.vintage-radio.net/forum/showthread.php?t=50432)

jazzy 6th Feb 2010 8:34 pm

8 diode bridge rectifier?
 
Hello
I have a old rf valve amplifier which has 8 diodes what make up a bridge rectifier circuit, i don't think this is a doubling circuit.
Why then has 8 diodes been use instead of the usual 4 ?
Thany you
Garry

valvekits 6th Feb 2010 8:45 pm

Re: 8 diode bridge rectifier?
 
Garry
I think this might be a way of increasing the Peak Inverse Voltage rating, assuming that there are four pairs of series connected diodes.

Eddie

Michael Maurice 6th Feb 2010 8:52 pm

Re: 8 diode bridge rectifier?
 
I assume the diodes are semiconductors. It is indeed a way of doubling the PIV, i've seen this used in several applications.

jazzy 6th Feb 2010 9:03 pm

Re: 8 diode bridge rectifier?
 
Thank you both for getting back to me ,yes there are two set of 4 diodes next to each other. I replaced them for higher rating as the first set fouled (was 500v now 1000v)
Thank you again
Garry

jazzy 6th Feb 2010 9:09 pm

Re: 8 diode bridge rectifier?
 
Just a thought why not just use higher rated diodes instead to increasing the Peak Inverse Voltage rating And why the need?

G8HQP Dave 6th Feb 2010 11:43 pm

Re: 8 diode bridge rectifier?
 
How old is it? Early semiconductor diodes did not go to high voltages, so doubling up was quite common.

Sideband 7th Feb 2010 11:35 am

Re: 8 diode bridge rectifier?
 
Indeed! It was not uncommon to use two semi-conducter diodes in series for just a simple half-wave rectifier. The early diodes did not have the high PIV of later types. With a bridge rec, there would quite often be two diodes in series on each 'leg'.


Rich


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