My bench has a magnifying ring light from Harbor Freight. That thing spews out 30khz noise a foot away from my scope probe. Switching ballasts. Sounds like you have some grounding issues .
When a 120 Hz hum is present after attaching the interconnects, that usually means there is an issue with the grounding scheme of the preamp or signal source.
The kit SMPS ground is electrically connected to its AC inlet ground prong. If there is a different arrangement for the preamp, or they are on different AC strips, then there can be ground loop problems.
The kit SMPS ground is electrically connected to its AC inlet ground prong. If there is a different arrangement for the preamp, or they are on different AC strips, then there can be ground loop problems.
DigiKey show two different types of writing
0.25 W = 1/4 W
means is the same power dissipation of quarter of one watt resistor.
Does this answer to your question ?
This Vishay blue are miniature size version of 1/4 watt = 0.25 watt resistor.
In this positions you not need more power dissipation so you can use them, no worry
In this positions you not need more power dissipation so you can use them, no worry
Just wait till you open the Detailed Parts List for the VFET front end card named Marauder. It provides error prone builders MANY more opportunities to order the wrong part, accidentally skip a line-item, mistype one character in a stock number, confuse nanofarads with microfarads, etc. A wonderful training exercise to (painfully) discover What Can Go Wrong.
Someone said it was a good idea to add 470uF, but NP said 70uF was fine.
I am sure 220uF Silmic II has a nicer sound than a random rubycon 10 000uF.
I am new to building electronics, but I am sure it involves child labour:
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@ Rewind
CMF55 have sufficient power dissipation, frequently overrated for the needs of Front End circuits,
but much smaller size if compared with big CMF60
CMF55 have sufficient power dissipation, frequently overrated for the needs of Front End circuits,
but much smaller size if compared with big CMF60
I took a look, and the worst case for these resistors is R4 on the front end
circuit, where you approach .1 W.
circuit, where you approach .1 W.
Thanks, NP! I don't deserve your help for my late night mistakes. But I think Digikey or Vishay mislabels these, because the CMF50 looks like 1/8W resistors.
I'm not sure if there is a real grounding issue or not. I had been trying to test with just a tablet as source, no preamp. After connecting a real preamp, the hum is completely gone.
I'm going to tie down the wiring, close it up and try in my primary system.
Thanks for the help, Zen Mod, astouffer and TungstenAudio.
I'm going to tie down the wiring, close it up and try in my primary system.
Thanks for the help, Zen Mod, astouffer and TungstenAudio.