A few questions about voltage doublers. I'm building a single tube 4CX250R for
70cm using a voltage doubler
supply. This is my first attempt at FWD supplies.
I have a transformer with about 750vac secondary, 12ohms dc resistance. I'm
planning on using IN5408 diodes and
a string of electro's.
(1) I can either use 5 x 190 uf 400vdc caps in each side of the stack, second
hand, or 5 x 1500 uf 250vdc caps
which are new but will give a much greater overall capacity. Is there such a
thing as too much capacity in the stack,
and will this make the supply too "stiff" if things go bang
(2) Is modern practice to still put C and R across each individual diode in the
rectifier stack.
(3) Is it good practice to place a diode across each cap in the stack, cathode
towards the + side, for reverse current
protection.
All advice gratefully received.
73
Glenn
VK4TZL
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|