Hi everyone
I'm trying to build a mono rack-mounted spring reverb, but I get stuck in PSU questions.
As seen as reverb tanks are pretty sensible devices and I'm not confortable including main wiring in my build, i'd like to use an external PSU for this build. I need a +/-18VDC (no idea about Amp needed, but it's a push pull amplifier, nothing more). Also, the reverb will have balanced in/out.
So i planned to use a +18VDC wall wart PSU, convert the voltage with 7818/7819 regulators inside the reverb and then power up everything.
Searching stuff i read the Jensen application note AS085 (http://www.jensen-transformers.com/wp-content/uploads/2014/08/as085.pdf) about proper grounding/shielding. Everything seems pretty clear to me but i'm not in the same situation: here you got the IEC connector right into the chassis, so you have the earth connection right there.
In my case i've got only two wires: the + and the - of the 18VDC floating wall wart supply. This means that the chassis is connected to earth only when it's connected to other chassis earthed device(i.e. mixer).
QUESTIONS CORNER:
Is that a problem about safety/noise?
The chassis will be floating at undefined voltage respect to earth if not connected to anything?
There is a better PSU/strategy that i could use?
I'm trying to build a mono rack-mounted spring reverb, but I get stuck in PSU questions.
As seen as reverb tanks are pretty sensible devices and I'm not confortable including main wiring in my build, i'd like to use an external PSU for this build. I need a +/-18VDC (no idea about Amp needed, but it's a push pull amplifier, nothing more). Also, the reverb will have balanced in/out.
So i planned to use a +18VDC wall wart PSU, convert the voltage with 7818/7819 regulators inside the reverb and then power up everything.
Searching stuff i read the Jensen application note AS085 (http://www.jensen-transformers.com/wp-content/uploads/2014/08/as085.pdf) about proper grounding/shielding. Everything seems pretty clear to me but i'm not in the same situation: here you got the IEC connector right into the chassis, so you have the earth connection right there.
In my case i've got only two wires: the + and the - of the 18VDC floating wall wart supply. This means that the chassis is connected to earth only when it's connected to other chassis earthed device(i.e. mixer).
QUESTIONS CORNER:
Is that a problem about safety/noise?
The chassis will be floating at undefined voltage respect to earth if not connected to anything?
There is a better PSU/strategy that i could use?