Posted by moray james [ 209.197.147.36 ] on July 13, 2005 at 15:01:29:
In Reply to: ESL Bias Supply Filtering Update posted by moray james on July 04, 2005 at 16:19:01:
Thought that I would post Ron's comments on this mod. Ron believes that the cause of the performance change in the speaker is as a result of a resonant circuit being formed by the choke and the speaker capacitance. Here are Ron's comments.
Hi Moray:
Those 500 Meg ohm resistors are too high to have any effect on the Q of a tuned circuit. Even 10 to 20 Megohms is pretty high. We could do a circuit simulation to show what effect the resistors would have but it maybe just as easy to connect the componets and measure the result.
The resonant frequency of a tuned circuit is equal too:
Fr = (2 * Pi)/(LC)^1/2
Where Fr = the resonant frequency
Pi = 3.1416
L = the circuit inductance
C = the capacity
The term (LC)^1/2 power is actually the square root of the (LC) product.
Hope this helps.
Ron
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