Norm,
The 74C73 MAXIMUM current use ( at highest rated frequency) is 100 microamps.
The FETs would only see power long enough to latch the relay.
100 microamps run continuosly would take 16.66 DAYS to consume 1 amp-hour.Your
batteries self discharge a lot faster than that.
So, you want to be able to move the switch in different directions, or do you
want an indication when the load is turned on?
LEDs make a low power indicator, are very reliable, and can be mounted near
the load so you don't need another wire.
A 74C73 IC is 30 or more year old technology, will do what you want, and can be
bought online anywhere. If you put a 1 microfarad capacitor between pins 7
(ground) and 14 (Vcc, +12 volts) , and a 100 ohm resistor between pin 14 and
+12 volts it will last forever. Well, longer than you will anyway.
Am I missing something? Do you want me to build you one so you can try it?
That will take a while as I am now totally dependant on other people for things
like stripping wire, soldering, etc. This one hand stuff sucks, big time.
Eric Thompson
S/V Procrastinator
South San Francisco
[EMAIL PROTECTED]
----- Original Message -----
From: Norm of Bandersnatch
To: [email protected]
Sent: Tuesday, July 29, 2008 12:19 PM
Subject: Re: [Liveaboard] Latching relay control
Eric.
Dust off your specs.
The control switch must not be a push-push because you cannot know when you
push the button whether the load goes on or off.
I also specified no sophisticated electronics, only simple, basic parts such
as relays, diodes, etc.
Also, in the quiescent state, that is when a button is not being pressed,
there should be no power used.
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
A J-K flip flop will do what you want for the load control.
------------------------------------------------------------------------------
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