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Old 9th May 2002, 10:04 PM   #81
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gratuitous
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Old 9th May 2002, 10:38 PM   #82
sonnya is offline sonnya  Denmark
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Harry : Lots of gain at low frequency.

ups! But thats okay!

Sonny
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Old 9th May 2002, 10:50 PM   #83
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Red face LF gain

Are you measuring at the output resistor R9? Whoops there is a bump in the record warp region. (below 1 Hz) Change C2 to 0.47uF. If your guys are gonna analyze my designs shouldn't YOU
fix them.....?

H.H.
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Old 9th May 2002, 10:57 PM   #84
sonnya is offline sonnya  Denmark
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No not at this point, but testpoint "4" at R5. I can see now that this is mostly DC-gain.
Neat idear with R9 after C3. C3 = Cerafine?
I did not make calc on R9 and C3 before i posted the first time.

Sonny
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Old 9th May 2002, 11:08 PM   #85
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Red face Cerafine would be fine

I had intended to use mostly Cerafine caps that Jocko gave me for this but I guess I could concede to one film cap. This is probably fine as is for CD. Good point, I ran simulation from 1 Hz and missed it. That pesky Spice! This is also a test bed for the Zetex mosfets that no one wants to talk about. DC gain is zero on cap coupled circuit by the way.
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Old 10th May 2002, 07:03 AM   #86
sonnya is offline sonnya  Denmark
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Thumbs up Re: Cerafine would be fine

Quote:
Originally posted by HarryHaller
I had intended to use mostly Cerafine caps that Jocko gave me for this but I guess I could concede to one film cap. This is probably fine as is for CD. Good point, I ran simulation from 1 Hz and missed it. That pesky Spice! This is also a test bed for the Zetex mosfets that no one wants to talk about. DC gain is zero on cap coupled circuit by the way.
I think it is a nice circuit. I know that the DC gain does not come through C9, i was talking about DC gain on the drain of X4.
Then you are actually going to build something you have simulated!?!?!?.... wow!

You do not know how many times i have said oopsss the last month!! I have been working on a weldcontroller for spot/resistancewelding... YEs they still use them with big Trafo and Thyristors.. There is about 3 - 5 things who need to be changed on the PCB.

But i am also working a highcurrent probe for AC wich works with a inductor with. Could be usefull for protection circuit in audioamplifier as it is not "inserted" into the circuit.

Sonny
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Old 13th May 2002, 04:53 PM   #87
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ah, inductors to detect current, cool. i was just flipping thru the digikey catalog around 3am last night and passed by some "current sensing coils." i was like, huh... then i thought, oh, that is pretty neat actually. let us know if you get it to work, as much as we hate protection circuits they're still better than a smoking amp (i would know.... )
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Old 13th May 2002, 07:06 PM   #88
sonnya is offline sonnya  Denmark
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hahaha ... hehe ... it does work!
I just need to write the software for it... it is easier to use than you think. Okay there are small problems with DC in the signal, but it is something we can around by using a DC servo. Or it can be used as a form of delay after a limit it reached.

It is actually dead easy to make the hardware!

Sonny
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Old 26th June 2002, 11:53 PM   #89
sam9 is offline sam9  United States
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Wink Don't know about being "junk" but $$$ !

I would not be inclines to class them as junk if only because so many folk seem to get good results from them. At the same time, a lot of people seem to get good results with much less pricey components. I'm kind of of the opinion that with a good design decent but ordinary components will do the job. But just as some people like to tart their Mustangs and Camaros up with chrome valve covers have no practical significance, I'm rather tolerant minded of folks who like to use the latest gold plated boutique components.

If we were practical we would realize we could get "good enough" sound from Circuit City.
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Old 27th June 2002, 12:07 AM   #90
dorkus is offline dorkus  United States
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Default umm...

sam, the title of this thread was sort of a joke. go read the first post.
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