There have been questions time and again in these pages regarding Anthony Holton's N-channel amplifier. I have just completed the second PCB of this amplifier and have found the sound to be really good.
Since there have been repeated requests for the PCB design, in a couple of days I will post the PCB design and a picture of a populated board. Only I need to know if I can send these as attachments to the Web Administrator (Jason).
I have a question in this regard. I plan to use about 70,000uf of capacitance per rail for a stereo pair. My transformers (1.1 KVa) produce about 85volts per rail off-load. I would like to insert inductors to form a pi-filter. What are suggestions to make inductors using EI core, either CRGO or CRNGO laminations. These would be cheap to make where I live.
What should the core rating be (to handle >10 Amps), the guage of wire and the number of turns? Any suggestions, including using torroidal cores would be much appreciated.
Thanks,
Since there have been repeated requests for the PCB design, in a couple of days I will post the PCB design and a picture of a populated board. Only I need to know if I can send these as attachments to the Web Administrator (Jason).
I have a question in this regard. I plan to use about 70,000uf of capacitance per rail for a stereo pair. My transformers (1.1 KVa) produce about 85volts per rail off-load. I would like to insert inductors to form a pi-filter. What are suggestions to make inductors using EI core, either CRGO or CRNGO laminations. These would be cheap to make where I live.
What should the core rating be (to handle >10 Amps), the guage of wire and the number of turns? Any suggestions, including using torroidal cores would be much appreciated.
Thanks,
With a +/- 85V rail the chokes need to be rated at 20A for a dual mono supply or (40A) for a mono supply feeding a stereo amp.These are peak amperage values.Tell the coil designers that you need a 'swinging choke' rated at 5A(10A) continuous and 20A(40A) peak.Pick the largest core size you can stand.Find out how much wattage this will dissipate and at what temperature rise.Pick a sensible temperature rise, say 30*C.Take the wattage figure and divide by the square of the continuous current.This will give you the maximum DCR of the wire.Select wire length based on DCR requirements.Balance gauge size/length vs maximum inductor volume.Whatever the inductance is, is whatever the inductance is (not critical).
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