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In Reply to: RE: Use a MOSFET or SCR posted by gusser on August 19, 2016 at 11:15:05
Hi Gus, thank you for the suggestion. Unfortunately, i don't have any of the devices you are referring to. While i am always open to trying new things, it seems that adding a switch and a cap is far easier and i have them in stock. I am also looking to gain more B+ would your implementation do that? regards.
Follow Ups:
Any device in series with the B+ will drop voltage. Like I said, a solid state junction is less than a volt drop and in a tube B+ circuit that's hardly significant.
To get more B+ you need more secondary voltage or explore capacitive voltage doubler options.
If it's a small b+ increase you need you can cheat a little by pushing the transformer AC input voltage up with a buck/boost transformer. Remember the step up ratio is in your favor here. But be careful of over heating, I would not go beyond 130 volts AC input.
Mosfets are a lot like vacuum tubes in that they are voltage operated and and a higher input impedance.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
With a LCLC filter if add some capacitance before L1 that will bump up the B+. I am pretty sure that adding 5uf will give me an additional 30 to 50 volts. I am going to take the ps to the shop today and put the additional capacitor in the circuit and see what i get. cheers
But if adding more first C increases your B+, that tells me there was not enough first C to begin with. I know it's a common trick to adjust the B+ by varying the first C but I don't personally like that approach.
He means going from a LCLC filter to a cLCLC filter.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I don't see how that would be a significant difference being either too low or too high.
model it both ways in PSUD. Remember that a CLC is going to differ in terms of what it can deliver vs. an LC supply. (higher B+, lower current)
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