DIY 120VAC Power Conditioning

[JimJ 5,000+ posts]

http://www.hagtech.com/pdf/conditioner.pdf

Thinking of building one of those...but frankly, seems almost too easy for the benefits touted //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Anyone with experiences with something similar?

Click to read more...

 

[thylantyr 10+ year member]

The last two DIY amp projects I worked on I installed one EMI/RFI filter

on the AC input like the one shown in the link. Reason? Because they cost me $5 at the

surplus store so why not ? I wouldn't spend $100+ on power conditioning

though. These are just capacitor and coil filters, perhaps cascaded to give

more filtering. There is no magic inside.

On the other hand, a common amplifier power supply designs may have

some capacitors already installed [but not the coils] in various locations in the

power supply or power input which is pretty good. Usually, the higher powered

amplifiers will have the capacitors and coils already designed in.

These filters are also used to keep equipment noise from leaking into your

house AC power, ie if you have a SMPS power supply inside your amp

that switching noise would not be cool to exit into your AC mains so one of

these could be used to keep the noise from leaking out. It also should keep

noise from coming in if it's designed accordingly.

Look here;

http://www.equitech.com/images/rep1-5.gif

That filter design could filter out noise in and noise out.

Here is what these EMI/RFI filters look like;

http://www.tri-mag.com/Filters/Filters.html

Notice the schematics for each type are similar. They have line and load side

because they were designed as 'one way' devices but they could be used

both ways, perhaps with reduced performance.