|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
152.131.10.193
One amp is a well named class AB amplifier.
The other is a class D amplifier with a switching power supply-32V DC.
I constructed a linear power supply for the class D amp..24V transformer- bridge rectifier- 15,000uf filter capacitor.
The resulting output voltage is too high for the class D amplifier so I took out the 15K capacitor.
I measured both amps at the speaker output and they both measure 0.3mv AC.
Do I need the filter capacitor on my power supply?
What does high DC ripple voltage sound like?
If I need to move this post to another forum...which one?
Follow Ups:
What are you using to measure the 0.3mV at the output of the amps? Is it a scope, a meter, or a cheap meter? 300uV isn't particularly bothersome.
There are 22V toroid transformers that will work pretty well with a bridge and cap for your class D amp.
You didn't say what the voltage requirement is or how much current the amp draws. A low value choke ahead of the filter cap might give sufficient voltage reduction. You can use PSU Designer to determine what's needed.
--------------------------
Buy Chinese. Bury freedom.
If you have a lot of noise in the power supply this is not going to help the class D amp. The noise will contribute to distortion at the very least.
24V is a bit high for the power transformer output. The capacitive rise results in more like 34V output rather than 32V. You could use a bucking transformer to reduce that- 2-3 volts ought to do the trick. This might be easier than trying to find a transformer with 22V output.
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: