John Curl's Blowtorch preamplifier part II - Page 19 - diyAudio
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Old 3rd July 2009, 06:10 PM   #181
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PMA, I don't mind sharing, but I wish that I COULD get in a word or two on this thread. You haven't answered my question PMA, should we have used an aluminum foil plated cigar box, or its equivalent for our case? Are our huge and expensive cases, just a waste of time and money? Also, you are happy with putting ceramic caps in the power supply bypass? Please think, before reacting.
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Old 3rd July 2009, 06:13 PM   #182
PH104 is offline PH104  United States
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400 series stainless steels are magnetic and easily machined. They are not as corrosion resistant as the "non-magnetic" 300 series (304, 316) steels.
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Old 3rd July 2009, 06:15 PM   #183
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Quote:
Originally posted by jacco vermeulen
Epcos B85321, metallized polyprop foil capacitors.
Manufactured in values up to 4.7uF, and subsequent 6''x2'' sizes.

(= what i use to go through 10mm Alu walls)
Jacco,

Where do you get those - Quakkelstein in Vlaardingen?

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Old 3rd July 2009, 10:39 PM   #184
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Dear John,
as far as I remember, the BT was a transconductance amplifier.
So maybe your answer could be guessed...but I'm curious.
In the case of voltage outputs, two schools of thought exists.
Those of maximising load currents through switches, connectors,wires, traces and solder joints and those which prefers a potentiometric approach.
This may be to a large extend a philosophical issue.
I'm curious about your general design philosophy on this.
Regards
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Old 3rd July 2009, 10:41 PM   #185
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I am not sure what you are talking about, BUT when I use the BEST switches, I don't 'seem' to need DC bias on the passive parts.
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Old 3rd July 2009, 10:43 PM   #186
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Sprague made 10uf feed-through caps in the past, for radio stations, etc. I have seen them.
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Old 3rd July 2009, 10:52 PM   #187
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ok, what about line level interface sections, inside or between home stereo equipment, do you prefer low or high load impedances?
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Old 3rd July 2009, 11:52 PM   #188
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I respect that, but seriously, I can't make any sense out of this thread. What am I missing?
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Old 4th July 2009, 12:35 AM   #189
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Quote:
Originally posted by sawreyrw
I respect that, but seriously, I can't make any sense out of this thread. What am I missing?

May be what's wrong with this thread is some input by some participants
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Old 4th July 2009, 12:47 AM   #190
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Sorry bear you understain wrong my post ,no Erno....
what I mean is that (all here know ) psu is audio psu as 50% of sound, I learning here that EI or r-core are more "audio" rispect toroid
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