On Thu, 2 Jun 2016 05:14:05 -0700 (PDT), Phil Allison
wrote:

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


.... Phil



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.

d

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