|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
24.187.197.46
In Reply to: RE: alternate circuit RE: Proposed schematic posted by maxhifi on October 12, 2016 at 15:35:59
Max - I'm sorry, you are correct. I didn't study your drawing enough. BTW, I measured the switch contacts on the 10amp switches I've been using and with over ten years use, none measured more than 10 milliohms. Use a godd, heavy duty switch and you'll be fine. - Pete
Follow Ups:
"Max - I'm sorry, you are correct. I didn't study your drawing enough. BTW, I measured the switch contacts on the 10amp switches I've been using and with over ten years use, none measured more than 10 milliohms. Use a godd, heavy duty switch and you'll be fine. - Pete"
Hi Pete
That's fantastic, I appreciate the fact that you both measured it and shared the results. 10m ohms is maximum initial contact resistance spec which is given for quality panel mount toggle switches from quality brands.
It's also an insignificant amount of additional impedance versus the 16AWG speaker wire run I am currently using, so I don't anticipate any changes to the signal. At first I wanted to use relays to accomplish this task, to perform the switching automatically when the home theatre receiver is turned on, but finding one with a 10 m ohm contact resistance begins to get difficult and more or less not worth it. Standard "ice cube" type relays are in the 50 - 100 m ohm range. Two in series makes 0.2 ohms, which is way too high to be considered absolutely transparent.
I think the key to maintaining this spec is not usage, but avoiding any switching under load. If these switches were used to actually switch 10A repeatedly, I doubt that I suspect the Chinese switches I ordered are more or less knock offs of the usual Carling or other US made switches, but obviously at a small fraction of the cost. I think your RS switches are likely sourced from a similar Chinese vendor, like most of their recent parts.
Max,
There is a nice looking Carling DPDT switch on the Antique Electronic Supply site, P/N P-H523, $7.65 ea. Doesn't list the current rating though. You'd have to ask. Looks heavy duty enough, made in Mexico if that makes you feel better. I do.
My Radio Shack switches may have been made in Taiwan, which has much better quality manufacturing.
Pete
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: