Just some pix of the results of 2 source resistors for a MOSFEt amplifier like the F4 or F5 -- the results are "normalized" and the setup identical using an HP3577 network analyzer. The first is the Mills 0.47R, the second is an Ohmite TWW5 series:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
are these the same mosfet source resistors we want to be non-inductive?
and we are seeing impedance vs frequency?
hmmmm .....
mlloyd1
and we are seeing impedance vs frequency?
hmmmm .....
mlloyd1
I thought we did want them to be a little inductive for stability. The plots sure look like impedance plots to me.
-TH
-TH
I've used the Caddock's on the F5's I have built. I didn't put them to the test -- yet -- see below 100 ohm MP915
For the source resistors, the 15W should suffice, no?
For the source resistors, the 15W should suffice, no?
An externally hosted image should be here but it was not working when we last tested it.
jackinnj said:
C'mon Jack, you are comparing apples and oranges. Caddock's MP915 are thick film, others are wire wound. The differences between the wire resistors is most likely due to the winding technology.
I'm using MP915 in the feedback loop for YAP, with very good results.
A bit of inductance above 2MHz might not be a bad thing if you want some HF stability. Right ?
😉
Patrick
😉
Patrick
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