|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
98.95.5.214
In Reply to: RE: diy JR filter ? posted by Tweaker456 on September 03, 2014 at 13:28:24
If you go too low on the secondary voltage, the power losses go up greatly, and there is more stress on the transformers to be able to pass a given amount of current.
The optimal range is about 2 to 1 to about 4 to 1.
In that regard, the Radio Shack transformers I originally recommended (and which are no longer available), were on the edge of being optimal. I used them and recommended them for the filter, because they were readily available at the time, and relatively low-cost, etc.
For a high power whole system filter, you would be better off using the SpikeMaster based circuit, found here:
http://links.dalrun.com/Electronics/Docs/Surge_Protection/files/AC%20Filter%20&%20Surge%20Suppresor.htm
You could then put one of the Quick & Dirty Digital filters on just the CD player, or DAC, or whatever digitally based device you have in your system. This would further isolate it from the other gear.
Jon Risch
Follow Ups:
Maybe around 4A, at a reasonable cost. 4 to 1 would be a total voltage across both rails for 120 would be 30V, 15V_0_15V?? 30vct. I believe the RS was 24V_0_24V. 48Vct. This is probably incorrect but I like to know the correct way to think about this. Thanks, Tweaker
Your thinking is on target, 30VCT would be a recommended minimum voltage.
At 4 amps and 30VAC, that would be approx. 120W, and probably less than 100W available to the load after loses and damping RC used.
No, I don't have a recommended specific transformer.
Jon Risch
12v-0-12v. I think that is what the RS was? Too low or ok. 30v is not easy to fine until one gets way up in price. Vetco has 24's at 4 and 5 A. Thanks, Tweaker
The Radio Shack transformers were there and available when I first did my project, which was designed to supply just a CD player with power that would not bleed back onto the rest of the AC line, or let through AC line nasties to the CDP. Thus, the total power capacity was not much of an issue, they had enough to power a CDP just fine.
They were OK, but not necessarily optimal.
The secondary does not have to be 30 VAC exactly, I mentioned a range of voltages in an earlier post.
Jon Risch
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: