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In Reply to: Re: Yo John posted by jneutron on March 21, 2007 at 11:46:10:
First of all Damping Factor is really a misnomer, it should be output impedance, that is if you're Dick Pierce.
I've measured into a resistive load over power and frequency and got a minimum of 12 milliohms to a maximum of 25 millohms.
I am not convinced just yet that output impedance would change into a reactive load, or at least change significantly.
Cheer up, if it doesn't I won't ask you to eat your shirt collar.
d.b.
Follow Ups:
shirt collar..he he..bet some here have no clue what that refers to..How did you measure the hf damping factor with an inductive load being driven at a low freq?? Yah I know, you just used single tone, didn't ya...so old school there dude..you gotta get into the future..
Best way I know of is a second amp, with a load resistor between them.
And two signal sources and a set of summers..
I can detail ya the setup if your really interested.. Unfortunately, it does start to define new standards of test and performance..
Yeah, I'm old school. Now my amp is a sliding bias and the output transistor bias will vary with signal voltage. The higher the signal voltage the higher the DC Bias. Now, as us circuits guys know, the higher DC bias will reduce output impedance. So your theory may well be more appropriate to AB designs with a "static" DC bias is my guess.
What do ya think there John;
d.b.
P.S. Post your technique, I will archive it.
nt
db: ""
So your theory may well be more appropriate to AB designs with a "static" DC bias is my guess.
What do ya think there John;""I think you are correct...you are just guessing...:-)
(sorry, couldn't pass that one up...)
Honestly, the discussion was without regard to topology. I do not know which topology will be better or worse.
db: ""
P.S. Post your technique, I will archive it.""Which part of "I can't post pics here" did you not understand???
Duh...
(boy, your given me such material today)...:-)
btw, I'm just preppin ya for your test..
I could put a drawing together for ya, might take a day or two..but I'd hafta e-mail it to ya..
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