|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
71.66.96.84
I want to add a choke to quiet the hum at idle . . My question is does a two wire choke have an input or output to it and if I add a capacitor before I run it to ground do I use an electrolytic and if so does positive or negative go to ground .Thanks in advance .
Donald
Follow Ups:
Could someone please answer the original post
Donald
If your amps are monoblocks as in the schematic then you should measure the actual B+ that is going to the trans CT. Putting in a choke will reduce your B+ even more so you need to know what your actual B+ is. If your actual B+ is close to stock you won't have much leeway for a choke. regards, Dak
PS someone suggested your problem may lie elsewhere, and I would agree. You should probably rebuild the amp if it is stock or troubleshoot a possible problem if it was just rebuilt.
"does a two wire choke have an input or output to it"
No, the two leads are interchangeable.
"if I add a capacitor before I run it to ground do I use an electrolytic and if so does positive or negative go to ground."
I thought some of the other members had answered this with diagrams. Anyway, capacitors in the power supply can be various types, depending on the value of the capacitor. The negative lead goes to ground if it's a polarized capacitor.
You know, I have to advise a lot of caution when someone asks me which lead of a high voltage cap goes to ground. :(
--------------------------
Buy Chinese. Bury freedom.
http://www.audioasylum.com/cgi/vt.mpl?f=tubediy&m=219476 This is the circuit I wish to modify
Donald
That circuit should be very quiet just as it is. Is this a new problem that's developed over time? If so, you might check the electrolytics and tubes (mismatched tubes can create hum). How sensitive are your speakers?
--------------------------
Buy Chinese. Bury freedom.
Can you post the schematic that you're interested in modifying?
How do you know that you have hum from the power supply, and not ground loop hum (or something else design/layout related)?
Boy it's a good thing you asked first(I hope) before wiring in the choke.
A choke is wired in series with the circuit used for where as the caps that isolate the choke goes to ground. If the caps are polarized then the negative goes to ground but if not polarized then it doesn't matter although many might challenge that.
You also have to use the proper value choke and current handling.
So I can wire it to the 40 MFD power supply from the grounded end in series . I need sesame street directions as I am real new to all this .Can you walk me through it in simple terms ? Thank you
Donald
A CLC or Pi filter is like the above schematic.
You need a cap before and after the choke.
First one so that the B+ stays about the same.
Second is to make the PS a voltage source.
If you post me off-board I can take you through it.
I will also need to model it in PSUD
to get the "right" choke for your amp.
DanL
"post me off-board"
That is not in the spirit of the forum.
Usually when somebody says that, they want to talk you into doing some ridiculous things without the scrutiny of the collective.
I'm not saying dalaudionut is going to talk you into $100 purple Chinese power cords to "wake up" your amp, but he did have my (and others) posts deleted for questioning his claims that it works on specific amplifiers.
Eli on the other hand seems to be a pretty stand up guy. If I were you, I would continue correspondence with this individual.
Ultimately do as you wish, I just would hate to see your brain get filled with mumbo jumbo while trying to learn some of the fundamental aspects of high voltage circuits.
Download PSUD yourself and experiment, it's fun and not really hard.
At the very least empowering.
Cheers
Infamous sockpuppet
"Type LE2-10 AC Power Cord improves the sound of amplifiers, receivers, CD players and CD transports, and makes a big difference in the picture quality, detail resolution and color balance of any kind of TV set, video projector, or DVD player."
That's just too funny.
--------------------------
Buy Chinese. Bury freedom.
I'm not one for snake oil either.
Take a look at Eupen power cords. I think you will agree how it "might" make a difference in some cases. If only in the sense that noise from other crap might be kept out of audio equipment.
You hit a nail squarely. If a power cord really improves things, it's by keeping EMI/RFI and garbage riding on the mains out of the HIFI circuitry. IMO/IME, there are less expensive ways of doing the same thing, without resort to an expensive voodoo power cord.
An outside possibility for real help from a power cord is when large wires carry current into a unit whose PSU lacks sufficient current reserves. That, in this poster's opinion, is bad design.
FWIW, I am most definitely not a fan of IEC connectors. They are another set of mechanical connections that can make trouble.
Eli D.
I have tutored many people on the asylum
long before you were ever here.
I don't know what your problem is but
your posts have been mostly negative.
Take a chill pill and relax.
DanL
At the risk of going off topic, you were the one who attacked me first by saying "WOW Your lack of knowledge is showing." when I suggested that one does not need to worry much about any practical transformer break in.
You then went on to claim that solder and wire insulation also needs to break in, then out of thin air tried start a SS vs Tube debate in a thread about transformers.
Remember that?
Negativity is in the eye of the beholder.
It's a good thing for you the Audio Illuminati does not exist. △
Infamous sockpuppet
You are setting up a CLC, AKA П (pi) section filter.
Eli D.
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: