Keith,
You are measuring under no load conditions. Keep the critical current requirement FIRMLY in mind. Until the rectifier winding begins to conduct continuously, the voltage measured will be high. Good regulation starts after the critical draw requirement is met.
You will not complete tweaking the "fudge factor" cap. until the amp is fully assembled and running. That's simply the nature of these things. 😉
You are measuring under no load conditions. Keep the critical current requirement FIRMLY in mind. Until the rectifier winding begins to conduct continuously, the voltage measured will be high. Good regulation starts after the critical draw requirement is met.
You will not complete tweaking the "fudge factor" cap. until the amp is fully assembled and running. That's simply the nature of these things. 😉
Thanks Eli,
I was about to post the same thing. kff322. without a load the inductor doesn't work and the circuit behaves like a capacitive input filter. Load it and watch the voltage drop to where you want it.
-Chris
I was about to post the same thing. kff322. without a load the inductor doesn't work and the circuit behaves like a capacitive input filter. Load it and watch the voltage drop to where you want it.
-Chris
Kieth,
A 1st approximation for the critical current (in mA.) = V/L. You need 480 V. and L = 3. The critical current for your situation is roughly 160 mA. Pull a steady 200 mA. from the PSU and then measure the voltage. Something in the neighborhood of 450 V. is what you'll read.
A 1st approximation for the critical current (in mA.) = V/L. You need 480 V. and L = 3. The critical current for your situation is roughly 160 mA. Pull a steady 200 mA. from the PSU and then measure the voltage. Something in the neighborhood of 450 V. is what you'll read.
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