Good morning everyone. Got my nobelium pedal built. I get a crackling static in the XLR and 1/4” outputs. I’ve tried with the 1/4 input disconnected. The vol/bass/treb knobs don’t affect the noise via the XLR (didn’t try those when the 1/4 was the output). I do get a nice bass sound through it when I tried to play for a second. I reflowed the solder on the tube sockets and the daughter boards. I also saw the led on v2 flickering. Seems like maybe somewhere in the power supply but I can’t find a schematic that includes the power supply section. I’m using a cioks dc7 at 9V to supply it. Any suggestions? A schematic including the power supply would be awesome. Thanks!
Nobelium preamp build
- Thread starter Kilo95
- Start date
vigilante398
Authorized Vendor
I would recommend reflowing the solder connections to the jacks, a couple points around there look suspect, and a flickering LED tells me there's an intermittent connection somewhere.
I'll get the full Nobelium schematic pulled in a minute and get it up here.
I'll get the full Nobelium schematic pulled in a minute and get it up here.
Power portion is on this thread. This is the basis for most of his projects. The trimpot isn’t used though. It has a fixed resistor in its place.
forum.pedalpcb.com
Tubes 102 - Intro to Power Supplies for Tube Circuits
I had planned to add this post on to the previous post about tube preamp design, but as I was writing it I found it getting way longer than I had planned, so I figured I would make it a separate topic. So how do I power these tubes? Well let’s start with the heater, without that you won’t be...
forum.pedalpcb.com
Tassieviking
Member
This is a trace I did from the Nobelium PCB when I got my PCB, I think it is correct but I will not guarantee it.
I always trace any PCB I get to better understand the circuit before I build them.
Cheers
Mick
I always trace any PCB I get to better understand the circuit before I build them.
Cheers
Mick
