Re: relays

On Thu, 13 Nov 2008 19:01:36 -0600, krw <krw@xxxxxxxxxxxxxxxx> wrote:

In article <8mgph4hknmqmf959batgdhgkm3h4ap8hhh@xxxxxxx>,
jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx says...
On Thu, 13 Nov 2008 14:42:00 -0600, krw <krw@xxxxxxxxxxxxx> wrote:

In article <f0583983-2192-4842-aeda-
0c9f852648ed@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, ggherold@xxxxxxxxx
says...>
On Nov 13, 12:20 pm, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Thu, 13 Nov 2008 10:07:20 -0700, Jim Thompson





<To-Email-Use-The-Envelope-I...@xxxxxxxxxxxxxxx> wrote:

On Thu, 13 Nov 2008 16:50:16 GMT, James Arthur
<bogusabd...@xxxxxxxxxxx> wrote:

a7yvm109gf...@xxxxxxxxxxx wrote:
I was arguing at work yesterday that relays have gain. Just because
it's non-linear and electromechanical doesn't mean it has no gain. I
mean a light switch has gain if you look at the power you can control
with a finger. I think that silicon guys think gain must be linear or
continuous, and be electrical in,electrical out. I think "gain" is
much broader.

 Am I right? Who owes who a beer? And on that note, could a carbon
particle microphone be so constructed that instead of a sound wave
input, I put a small headphone-style coil on one side and then arrange
it to have gain? Does a coherer have "gain"???

Ah, the basics.

100mW into a relay can switch 1kW or so, so that's a gain of
10,000, minimum.

Cheers,
James Arthur

Good point!  Weren't relays the _very_first_ gain element?

                                       ...Jim Thompson

No, it was probably hydraulic.

John- Hide quoted text -

- Show quoted text -

Oh what about mechanical. The old fulcrum and lever.

Again, no gain. Does a transformer have gain?

No power gain, can't build an oscillator [1]. But if you allow voltage
gain, or current gain, sure. Or price gain.

Ok, then by the same argument, a lever has gain. I wouldn't call it
gain though.

Play with words, or numbers, all you like. I have been careful to
specify "power gain."

John

.

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