Re: AC/DC & POWERSTATION KIT BUILD THREAD
Posted: Thu Jul 14, 2011 12:06 pm
okmicdaddy wrote:Hello,
I have here a JLM powerstation. I'm using V1 V2 and 48V.
C1 and C2 are the pump charge caps for the 48v rail. They will only puff up if the power secondary transformer AC voltage is to high or there is a dead short on the 48v rail or the doubler/tripler jumper is set wrong. What power transformer are you using and what is its output voltages? What have you got the tripler/doubler strap set to? IS this a full JLM powerstation kit of parts with our 1000uF 50v caps?C1 and C2 on the powerstation went puffy on me only after having it burnt in and working properly for >24hours.
Ok that is fine if there are no shorts in the build.The condition of which they went puffy, I was firing up 4x 1290 preamps from V1, and using 48V from the powerstation to supply 4x gobetweens.
Are the leds soldered directly across the top two legs of the 48v toggle switch with long leg closest to the edge of the PCB?3 of the 4 gobetweens phantom LED lit on first power up, 1 lit only momentarily and then went dead. All 4 channels did measure proper phantom voltage that was available at the powerstation terminal, including the channel with the now dead LED.
Do you get zero ohms between all audio 0v and GO between 0v points and XLR pins 1's? Are the in and out XLR wired mirror image of each other?I'm now experiencing hum on any channel that has phantom engaged. The 3 LEDS that initially lit up are all still working properly, phantom is still available on all channels, but I seem to have pissed off the powerstation as C1 and C2 are puffy.
Answer above questions and I should be able to get you sorted and send any photo's of your wiring and powerstation PCB top and bottom to my email address.My question would the dead LED gobetween suggest a fault that would cause the caps to bulge, i.e. a possible short, or too much current draw? They appear to still be functioning as there is still phantom voltage at the powerstation terminals, though clearly they have been worked over and need to be replaced. Before I go puffing out more capacitors I'd like to wrap my head around root cause.
Powerstation Schematic is in the first post of this thread with the full build and setup instructions. If you have trouble downloading the PDF's read the first thread on the kit forum.Are these filter/reservoir caps for the 48V section or what exactly are C1 C2 doing? Is there a schematic I missed for the powerstation? Thanks
Ben