On Thu, 2 Jun 2016 05:34:23 -0700 (PDT), Phil Allison
wrote:

Don Pearce wrote:

Phil Allison

Don Pearce wrote:



** The non sealed types I have come across develop bad contacts
( high resistance) and cleaning them is PITA.



Mosfets are an excellent alternative to relays these days. On
resistance of a few milliohms in cheap packages.


** Shame about the many drawbacks, like having an *internal diode*
in parallel and needing to be driven with a gate voltage to get that
low resistance.

Not a practical alternative to a DPDT mini-relay you can by for a
couple of dollars.

http://sound.westhost.com/articles/muting.html#s4




Just use enhancement mode devices. Gate up at source voltage - the FET
is off. Drag it down by five volts, it is fully on. Pretty much the
same driving method as a five volt relay. And no contacts to get
dirty.


** Same bull**** as before, one mosfet will not do the job for line level signals and having to bias it on makes it almost useless.

The link I quoted has the story right.


.... Phil

If you say so. It has always worked for me. How do you operate a relay
without having to "bias" it on?

d

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