fireismyflag

hi, I have a digital circuit and I need help

my circuit emits a output signal that is high for 0.3 seconds and low for 4 seconds, I need that during the high period my circuit closes the path for a second signal to flow from Transmiter A to Receiver B

I tried using and AND gate B=A.X but it wont work, the second signal cannot be polluted in any way, and i can't use a transistor because, once the path is closed, the information travels from A to B and from B to A, I need to know how to do it.

(SEE ATTACHMENT BELOW)

The only way I see is with a relay, but id like to know if anyone has better ideas.

If you are curious, I want that my circuit closes the path for a keyboard controller, It would be like pressing the key on your keyboard for 0.3 seconds every 4 seconds. I already got the controller and determined the circuit I need to close for it to send the right keystroke, I already got the timer and everything but cant get the signal to go from A to B with the circuit, please help me.

thank you

Attached Images

	x1.gif (1.9 KB, 181 views)
	x1_161.gif (1.3 KB, 180 views)

bmcculla

The device you need is called an "analog switch". Digikey should have a bunch of them.

Brent

Russlk

Use an opto relay. Omron series G3VM or Fairchild HSR312 should work. The logic high will be able to drive the LED, be sure to use a current limiting resistor.

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