[Amps] SB-200 power supply diodes
Steve Thompson
g8gsq72 at gmail.com
Sun Mar 27 14:54:20 PDT 2011
http://www.duncanamps.com/psud2/index.html for a dedicated pspice
programme which will give you a very good idea of what's what in a
PSU - including allowing for transformer resistance which isn't so
easy with the pen and paper version, and giving you rms current
values so you can guage heating effects (can be higher than you
might expect).
For what it's worth, my pen and paper guess puts the conduction
angle at 13ish degrees at 0.6A dc, which means the average current
during that 13 degrees is 8.3A each half cycle. Since the current
waveform is not rectangular, the peak current will be somewhat
higher and each diode will see it on alternate half cycles, which
is 50 or 60 times a second, depending on where you are.
Steve
> Think about this again...
>
> Please send your math that supports your claim below as to current draw (3 to 6
> amps 60 times per second)?
>
> Also, please take a look at the schematic of both the SB-200 and the SB-220 and
> substantiate your claim of resistors and capacitors across the diodes.
>
> And... The original diodes supplied with both amplifiers are rated at 600mA....
> And there are THOUSANDS still working with them.
>
> 73
> Jim W7RY
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