Dear Members,
I built a tube amp, and I have problem with 50Hz noise, what is come from the PSU. The problem is after the 100uF, 100R, 330uF CRC filter 50Hz hum is audible, and base on the measurement the 50Hz noise is quite high 123mV RMS (512Vpp). I have built the PSU and the Tube stage together into one PCB so I have limited possibilities. I have two option:
Replacing the 100R resistor with MEC-100 electric choke
https://hfc-fs.s3-eu-west-1.amazonaws.com/s3fs-public/tentlabs_mec_datasheet.pdf
Or using a Mosfet filter parallel with the 330uF capacitor. I would like to implement the following circuit
HV Power Supply
I attached the Lt-spice simulation of the new circuit. What do you think If I solder two wire to the legs of the 330uF capacitor, and build a separate PCB with the few components, and connecting them parallel with the capacitor acording to the LT-spice circuit It will work?
I built a tube amp, and I have problem with 50Hz noise, what is come from the PSU. The problem is after the 100uF, 100R, 330uF CRC filter 50Hz hum is audible, and base on the measurement the 50Hz noise is quite high 123mV RMS (512Vpp). I have built the PSU and the Tube stage together into one PCB so I have limited possibilities. I have two option:
Replacing the 100R resistor with MEC-100 electric choke
https://hfc-fs.s3-eu-west-1.amazonaws.com/s3fs-public/tentlabs_mec_datasheet.pdf
Or using a Mosfet filter parallel with the 330uF capacitor. I would like to implement the following circuit
HV Power Supply
I attached the Lt-spice simulation of the new circuit. What do you think If I solder two wire to the legs of the 330uF capacitor, and build a separate PCB with the few components, and connecting them parallel with the capacitor acording to the LT-spice circuit It will work?
Attachments
Why are you plotting noise? 50Hz isn't that kind of noise. Plotting the output voltage will show the ripple in those simulations allowing comparison.
The MOSFET circuit can't just be wired in parallel, it has to break into the rail itself so a daughter board would need at least 3 wires to the existing circuit.
The MOSFET circuit can't just be wired in parallel, it has to break into the rail itself so a daughter board would need at least 3 wires to the existing circuit.
Thanks,
You are right, I run simulation again, and I will check the possibilities where can I cut the trace.