merrill

Thanks for your input. It is absolutly necessary that the AQZ202 relay turn on at power up. The 4013 circuit will toggle the relay, but the relay is on randomly at power up. I have been told the 7474 circuit would guarantee the relay would turn on at power up. This is what I am trying to accomplish. Yes it does turn on at power up, but it won't toggle. No luck yet. The piezo switch is made by ITTCANNON. It is a very durable switch.

The photo mos switch is working very well. The problem is in the 7474 toggleing the way the circuit is configured. It should toggle , but I am overlooking something.

Thanks for the input. A primary design feature for this toggle switch is it use the photo mos switch in the output as shown in the schematic, and a piezo momentary switch in the input side. The 7474 IC or one that will work is important because it needs to take up minimum space. (No moving parts and small! No mechanical relays allowed.)

I am trying to make a solid state toggle switch using a piezo momentary push button switch in connection with a flip flop. I have tried a7474 flip flop circuit without sucess. I want the out put of the 7474 to be on at power up and toggle it on or off with the piezo switch. If this would work it would be a toggle switch that would last indefinetly. If any body thinks they have any ideas I could email you my circuit. I have tried a 4013 with good success for switching but the output comes on randomly at power up. I need it to be on always at power up. Any body have an idea?