producer4000
Well-known member
Hello, all. As summer quickly approaches, I'm getting ready to begin my first big project for this year. I want to do an eight channel G9. However, I'll need some help with the power supply. I think Bjorn may still be having a little trouble with his PSU, so maybe we can both benefit from some discussion with everyone.
Electronics school has been 14 years ago, so I don't really remember that much of it anymore (wish I'd paid better attention) and some of the 'rules' escape me at the moment. Hopefully some of the members who have working multi-channel G9's can help me sort this out.
What I'd kind of like to do is get a Xformer for each of the required supply voltages. First, can I do this? If not, I'll just get two 15V 120VA Xformers (there is room in the PSU compartment). If so, should I rectify and regulate right there and then buss the supply voltages out to each 'card' (a card being two channels, just like the PCB except a little bigger)?
What then would I have to do to the capacitor values to handle the increase in current (I know the voltage values remain the same and I have to spec the rectifiers and regs). IIRC, Jakob has said that the 245v draws <10mA per tube and the 12v draws <250mA per tube. 48v phantom should not really be an issue but I'll make sure it can supply at least 500mA.
Would it be easier to just get the supply voltages and rectify/regulate on each 'card'? I don't think you're supposed to use more than one rectifier per voltage but I'm not sure about that. :?
Anyhow, any help from the multi-channel guys (or anyone for that matter) is greatly appreciated and respected.
:guinness: Chris
Electronics school has been 14 years ago, so I don't really remember that much of it anymore (wish I'd paid better attention) and some of the 'rules' escape me at the moment. Hopefully some of the members who have working multi-channel G9's can help me sort this out.
What I'd kind of like to do is get a Xformer for each of the required supply voltages. First, can I do this? If not, I'll just get two 15V 120VA Xformers (there is room in the PSU compartment). If so, should I rectify and regulate right there and then buss the supply voltages out to each 'card' (a card being two channels, just like the PCB except a little bigger)?
What then would I have to do to the capacitor values to handle the increase in current (I know the voltage values remain the same and I have to spec the rectifiers and regs). IIRC, Jakob has said that the 245v draws <10mA per tube and the 12v draws <250mA per tube. 48v phantom should not really be an issue but I'll make sure it can supply at least 500mA.
Would it be easier to just get the supply voltages and rectify/regulate on each 'card'? I don't think you're supposed to use more than one rectifier per voltage but I'm not sure about that. :?
Anyhow, any help from the multi-channel guys (or anyone for that matter) is greatly appreciated and respected.
:guinness: Chris