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Old 21st January 2009, 07:02 PM   #1111
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Thinking about it a bit, I seem to remember that there are terminals intended to allow the connection of an inductor or resistor. Nice little boards, I think I'll go buy some.
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Old 21st January 2009, 07:34 PM   #1112
pooge is offline pooge  United States
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Quote:
Originally posted by pooge


I doubt the class A input circuitry needs to worry about peak current delivery since it is constant current. Thus, I would assume inclusion of the resistor would be MUCH more advantageous for filtering variations due to the current pulses in the output stage than any possible reduction in peak current delivery, if that is in fact a potential problem.

If the CRC is for the output stage, I do agree that an inductor may be a better choice; especially if it is placed away from the amp circuitry, as such an inductor may radiate into the circuitry. The front end would also be the most intolerant of such radiation.

It appears I was talking about the wrong boards. I thought it was the Leach amp boards being discussed. So I do not disagree with what Andrew said regarding the separate PS boards.
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Old 21st January 2009, 07:44 PM   #1113
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by pooge
I doubt the class A input circuitry needs to worry about peak current delivery since it is constant current.
the ClassA voltage amplifier stage is not constant current.
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Old 21st January 2009, 07:53 PM   #1114
pooge is offline pooge  United States
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Quote:
Originally posted by AndrewT
the ClassA voltage amplifier stage is not constant current.

Are you including the driver stage in this statement? Otherwise, I believe it is constant current.
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Old 21st January 2009, 08:08 PM   #1115
pchw is online now pchw  United States
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Quote:
Originally posted by AndrewT


If the resistor were to be replaced by 100turns of 0.6mm diameter enameled wire, ...
Hi Andrew,

A stupid question, what is the equivalent of 0.6mm in terms of gauge, 14ga, 12ga?

thanks!!
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Old 21st January 2009, 08:15 PM   #1116
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http://en.wikipedia.org/wiki/American_wire_gauge says roughly 22 gauge. Perhaps Andrew mis-typed 1.6mm/14 gauge?
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Old 21st January 2009, 08:54 PM   #1117
pchw is online now pchw  United States
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Quote:
Originally posted by samoloko
do you have BOM for that pcb
also does the pcb support center tap transformer secondary
chas could you give us more Information about transformer
Here is the BOM. It is an zipped excel spreadsheet.
Attached Files
File Type: zip minialeph-ps-parts-list.zip (3.1 KB, 33 views)
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Old 21st January 2009, 09:01 PM   #1118
pchw is online now pchw  United States
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Quote:
Originally posted by BobEllis
http://en.wikipedia.org/wiki/American_wire_gauge says roughly 22 gauge. Perhaps Andrew mis-typed 1.6mm/14 gauge?
Thanks, Bob.
I have some air coil from crossover. There might be a few 14ga. I am tempted to use those if possible - I suppose that a few turns is still better than a straight jumper
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Old 21st January 2009, 10:29 PM   #1119
AndrewT is offline AndrewT  Scotland
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Hi,
100T of 0.6mm wire on a 13.4mm bobbin wound as 10.6T/layer and 9.6layers will have an inductance of ~170uH and a resistance of ~0r37
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Old 21st January 2009, 10:45 PM   #1120
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Andrew,
Please quote me a source for all that great information. It is something that may be quite useful in the future.
Thanks Tad
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