Jed
Well-known member
Hi folks,
So I’ve finally got one channel of PM-1000 racked up. I’ve got another ready to drop into the case but I wanted to get this first channel running smoothly first. This has been one of my first DIY projects and it’s been tons of fun – a huge learning experience too. Thanks to everyone who has posted their projects on here in the past…you’ve all been a huge help!
I got everything wired up yesterday and finally turned it on. Tested voltages. Everything checks out. Pushed audio through it. It works! Wahoo! :grin:
[Well, mostly wahoo. The EQ doesn’t seem to be working, but these channels had broken inductors. I replaced them with some other inductors but the EQ is still dead. Something is screwed up somewhere. :? But I digress…]
Here’s my issue:
I’m using the PowerOne HB48-0.5-A power supply that a lot of people recommend for this project. The thing hums. Not quite as loudly as a fluorescent light fixture but enough for me to hear it. Certainly louder than the CRTs in my control room.
Now, luckily, the audio path is clean as a whistle (in fact, it is dead silent – I did the recap and changed out the transistors – sounds great!). But I’m pretty darn sure that my Baby Bottle is going to pick up the sound of this transformer humming away unless I record at a significant distance. And given the size of my tiny "studio" I can only get about 10 feet away at best. :roll:
So I’ve been looking around on here, but I’m not finding any solutions that make me feel particularly hopeful.
http://www.groupdiy.com/index.php?topic=12354
(drop the transformer in a can of varathane – hmmm, I don’t really want to take apart the power supply, but if I have too I suppose I could. Sounds messy.)
http://www.groupdiy.com/index.php?topic=7167
(Replace the transformer. This is a “duh” but I’ve already had this power supply too long to send it back and I’d rather not be out another $40… I suppose this is where I’ll end up if nothing else turns up.)
http://www.groupdiy.com/index.php?topic=3093
(Tighten transformer lams, maybe do some DC filtering? I don’t think I have loose lams, but maybe the DC thing could be the issue? None of my other equipment seems to exhibit this problem though, and it’s all on the same star-grounded circuit.)
And that’s pretty much all I’ve found so far. Does anybody have any other thoughts on this kind of situation? Any other PM-1000 owners come across this problem?
So I’ve finally got one channel of PM-1000 racked up. I’ve got another ready to drop into the case but I wanted to get this first channel running smoothly first. This has been one of my first DIY projects and it’s been tons of fun – a huge learning experience too. Thanks to everyone who has posted their projects on here in the past…you’ve all been a huge help!
I got everything wired up yesterday and finally turned it on. Tested voltages. Everything checks out. Pushed audio through it. It works! Wahoo! :grin:
[Well, mostly wahoo. The EQ doesn’t seem to be working, but these channels had broken inductors. I replaced them with some other inductors but the EQ is still dead. Something is screwed up somewhere. :? But I digress…]
Here’s my issue:
I’m using the PowerOne HB48-0.5-A power supply that a lot of people recommend for this project. The thing hums. Not quite as loudly as a fluorescent light fixture but enough for me to hear it. Certainly louder than the CRTs in my control room.
Now, luckily, the audio path is clean as a whistle (in fact, it is dead silent – I did the recap and changed out the transistors – sounds great!). But I’m pretty darn sure that my Baby Bottle is going to pick up the sound of this transformer humming away unless I record at a significant distance. And given the size of my tiny "studio" I can only get about 10 feet away at best. :roll:
So I’ve been looking around on here, but I’m not finding any solutions that make me feel particularly hopeful.
http://www.groupdiy.com/index.php?topic=12354
(drop the transformer in a can of varathane – hmmm, I don’t really want to take apart the power supply, but if I have too I suppose I could. Sounds messy.)
http://www.groupdiy.com/index.php?topic=7167
(Replace the transformer. This is a “duh” but I’ve already had this power supply too long to send it back and I’d rather not be out another $40… I suppose this is where I’ll end up if nothing else turns up.)
http://www.groupdiy.com/index.php?topic=3093
(Tighten transformer lams, maybe do some DC filtering? I don’t think I have loose lams, but maybe the DC thing could be the issue? None of my other equipment seems to exhibit this problem though, and it’s all on the same star-grounded circuit.)
And that’s pretty much all I’ve found so far. Does anybody have any other thoughts on this kind of situation? Any other PM-1000 owners come across this problem?