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In Reply to: RE: Will you Marry Me? posted by Cousin Billy on January 22, 2016 at 01:46:31
I'm so sorry, but we're cousins and should not get married.
You don't want "mH" (millihenries); you want Henries of value. Between 5H and 10H should be fine. I actually have some small-size 7H inductors with a DCR of several hundred ohms. Those would work. You need to know approximately how much current you are drawing. The inductor must be rated so as to tolerate the current across it. Here is where I am leary of asking you to do something potentially dangerous, but if you can safely measure the voltage across the 1K resistor, the calculation is done using Ohm's Law, V = current X resistance. In this case, R is known to be 1K and V is equal to the V on one lead of the resistor minus V on the other lead. Having said all that, based on my own familiarity with the circuit, probably a 100mA rated inductor is fine, overkill in fact. Check the Hammond catalog.
is just making sure that the power supply looks like a straight line on the 'scope.
If you decide to install a choke instead, before drilling any holes fire the amp up and put a high level signal through the voltage amplifier (amp on Standby IOW) and see what sort of noise is present on the filter caps feeding the voltage amp, using your choke instead of the resistor.
I think though that what you will find is that the CCS in the voltage amplifier is more important than the power supply. If you look at its design, it is built to reject power supply noise.
Was just trying to give Cousin Billy something to do. I know what it's like to get the itch.
This is the choke already in the amp.
Who knows it's value's?
The choke we see is paralleled with the 200uF cap.
I will assume any new chokes will attach as the resistors are attached?
I doubt that it is in parallel with a 200uF capacitor; more likely the capacitor is in parallel with the output from the full wave bridge rectifier, and the choke is in series with the FWBR. But as to value, I am sure Ralph can help.
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