A J-K flip flop will do what you want for the load control. A 74C73 IC will operate on 12 volts, will withstand up to 18 volt transients and contains 2 J-K flip flops. Connect both the J and the K inputs to Vcc (pin 14). Now connect the clock pin to a 20 K ohm pull-up resistor, a .1 microfarad capacitor and a momentary contact push button switch. Connect the othert pole of the switch to ground. Every time you push the button the TWO outputs (Q and Q') will change state. Q and Q' are always opposite ( true and inverted outputs). There are also SET and RESET inputs to allow power on state determination. This IC can not drive the relay coils directly, but a coupl;e of FETs can handle that chore. The FETs should be fed power through the use of a monostable flip flop ( a 'one-shot') set up to enable the FET circuit about 5 times as long as it is supposed to take for the latching relay to change state.
Eric Thompson S/V Procrastinator South San Francisco [EMAIL PROTECTED]
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