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|18th August 2003, 06:44 AM||#1|
Seeking advice on my first shot in designing a 5842 DC'ed to 45
Hi, I would like to seek advice if what i have came up with is correct.
Sorry for the poor photo above of the diagram but I hope it would help. Based on some formulas i've gathered, I came up with:
My operating point for the 5842 driver stage is as follows -
Plate voltage of 98.5V current of 20mA and bias of 1.5V
Rk = 75 ohm (1.5V / 20mA)
Bypass cap is 470uF from C = 159 / (5 * 0.075) = ~ 424uF
My operating point for the 45 is as follows -
Plate voltage of 275V at 36mA
I calculated Rk of 4,166 ohms which will give me a cathode to ground of 150V
My B+ is 150V + 275 (plate to cathode) = 425
Grid voltage is -50, so 150V - 50V (grid to cathode) = 100V which is provided by the voltage divider made up of 220K and 68K resistors.
Am i on the right track or I completely lost it?
Appreciate any help. Thanks!
|18th August 2003, 02:19 PM||#2|
Join Date: Jul 2003
Location: Ann Arbor, MI
Find Roscoe Primrose. He has been fooling about with this topology for a while and the last time I heard it, it sounded pretty good compared to some other SET that were there.
the Tnuctipun will return
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