I was thinking the gentle cycle. LOL. Using the new Cold water Tide as the thing is water cooled.
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Bias design, amplifier design, filtering etc.
- Thread starter -=PEAKABOO=-
- Start date
heres a patent for a constant voltage/constant current bias supply
Dual (constant voltage/constant current) bias supply for linear power amplifiers - Patent 6922107
Dual (constant voltage/constant current) bias supply for linear power amplifiers - Patent 6922107
interesting link,
it notes the same problem i did regarding constant current bias not having the ability to track modulation of the signal due to the bias circuits very high output impedance,
their answer was to add a current boost pass transistor to make it act like a constant voltage source but that also degrades their circuits ability to track temperature changes in the rf devices,
im interested to see what circuit ken has in mind and how it operates
it notes the same problem i did regarding constant current bias not having the ability to track modulation of the signal due to the bias circuits very high output impedance,
their answer was to add a current boost pass transistor to make it act like a constant voltage source but that also degrades their circuits ability to track temperature changes in the rf devices,
im interested to see what circuit ken has in mind and how it operates
This has been a very informative thread!!!! I am glad I found this forum. Peakaboo is even on here! This is where he hides from the other forum LOL.
I have been on this forum for years man. I just did not post for about a year or so and I lost my original status
I wish there was a way to fix that but maybe not.
This forum original started I believe about 10 or so years ago and I was a member from then on. CDX#10 by default.
That is just the bias circuit in the picture, it is 6x2SC2879 amplifier.
Yes I am familiar with 6 meter amplifiers, never did anything that did that much power though.
getting your 6pill bias on yo
are you using the three transistors to track heatsink temp?
what is the drift like
how well does base voltage hold up at full drive
yes i am a nosey _ _ _ _ but i aint biased
Yes, 3 transistors, 1 per stage to track heat.
Very stable at the drive levels I have tested it at.
Drift? I see no drift except for when the heatsink is warming up.
Very neat.
Like those 10 watt ( they look 10 watts) chassis mount resistors... those dam things are expensive.
Very nice layout.
Thanks for posting the pic
..... and that is why I have always liked Jokers
Like those 10 watt ( they look 10 watts) chassis mount resistors... those dam things are expensive.
Very nice layout.
Thanks for posting the pic
..... and that is why I have always liked Jokers