[BC] Need AC Line Noise Suppressor

[Mark Humphrey]

I use metal-cased EMI filters (Corcom, Cornell-Dubilier, etc.) and mount them in a square metal electrical box.  MOVs can be added across the load side of the filter for extra protection. Typical current ratings are 5 to 30 amps, and the series impedance is similar to that of a lighting choke (about 3k ohms at 1000 kHz.)

These filters are often seen at hamfests for $5 or so, or you can find them at surplus dealers:

https://www.surplussales.com/Feedthrus/FT-EMIRFI1.html

https://www.surplussales.com/Feedthrus/FT-EMIRFI2.html

Mark

On Fri, Jul 4, 2014 at 2:18 PM, Milton R. Holladay Jr. <miltron at att.net> wrote:
>How about a simple pi filter ?
>Got a couple of 1 mfd capacitors and an extra tower lighting choke ?  Some
>other similar choke ?