I'm adding a JLM Go-Between to my DIY pre amp. I'm using this transformer to power the power supply. It's a 15VA 0-25 0-25 toroid which gives me 50Vac when wired in series. 50 / 15 = 100mA, which I think is well within spec for phantom power.
Without the Go-Between hooked up to the power supply, power supply outputs 50Vdc. When I plug in the Go-Between the voltage at the output of the power supply drops to 32Vdc. When I plug a condenser mic into the pre amp the voltage drops further to 22Vdc.
Do you know what could be causing this?
Thank you.
Phantom power sag when Go-Between is plugged in
Moderator: Joe Malone
-
- Posts: 7
- Joined: Tue Apr 26, 2011 10:46 pm
- Joe Malone
- Site Admin
- Posts: 2078
- Joined: Wed Jan 24, 2007 11:35 pm
- Location: Brisbane, Australia
- Contact:
Re: Phantom power sag when Go-Between is plugged in
What power supply are you using to convert the transformer ac to a regulated dc power supply?
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
Capturing Audio without Injury
-
- Posts: 7
- Joined: Tue Apr 26, 2011 10:46 pm
Re: Phantom power sag when Go-Between is plugged in
Hi Joe,
Thanks for your reply but I have just this second solved the issue! It turns out I had wired the power transformer incorrectly.
I'm using a power supply PCB that 'ruffrecords' produces over on the Group DIY forum.
Thanks,
Matt
Thanks for your reply but I have just this second solved the issue! It turns out I had wired the power transformer incorrectly.
I'm using a power supply PCB that 'ruffrecords' produces over on the Group DIY forum.
Thanks,
Matt