Has anyone got a simple codelock witch I could use instead of my power-on button (probably using an optocoupler right?). I made this one (http://www.circuitos.terra.cl/schem/r86.gif) using a TIL111 optocoupler but for some reason it isn't working. Probably I've just missoldered something, so I'll check it again (for the 5th time ). So has anyone got any other circuit wich resembles this so that I could eventually make a new one?
That one looks really hard to make . I'm trying to design one myself using the 4022 IC they also use in the circuit I made but since I almost don't know anything about electronics that will be a though job .
Allright, so I made a new schematic in CircuitMaker 2000. Could anyone check it for errors (there will be probably lots of them )? Download sheme *mod: I just thought of it, you ppl can't know which letter is which pin. So here they are: CP1: 13 CP0: 14 MR: 15 Q4-7: 12 Q7:10 Q6: 5 Q5: 4 Q4: 11 Q3: 7 Q2: 3 Q1: 1 Q0: 2 Datasheet of the 4022 IC: http://www.fairchildsemi.com/ds/CD/CD4022BC.pdf
It seems I forgot to tell what the circuit should exactly do . So here we go: When you start pressing the code you have about 0.5 second to press the next button or the circuit is reset (a logical 1 on pin 15). When you press a wrong button the circuit gets reset too. When the right code is pressed the chip should turn on the led/optocoupler that's linked to pin 10 and afterwards it should go back to it's original state (=reset).
What happened to the MOSFET and the resistors? Also, the switches don't connect to the positive supply.
That's exactly why I'm asking your guys help. As I said, I don't know anything about electronics except some real basic things. Please help me out here.