Hello,
I am trying to build this circuit straight from a book (Make: electronics by charles pratt)
here is a diagram:
**broken link removed**
Its a keypad password circuit. Basically push the buttons in the right order and the relay and the LED turns on from the output of the 555 timer.
1. My problem is that the gates dont latch
2. i get false positives from my AND gates
3. Sometimes the 555 outputs simply when i turn the circuit on?
I tried troubleshooting without success. Please help. Thankyou in advance
I am trying to build this circuit straight from a book (Make: electronics by charles pratt)
here is a diagram:
**broken link removed**
Its a keypad password circuit. Basically push the buttons in the right order and the relay and the LED turns on from the output of the 555 timer.
1. My problem is that the gates dont latch
2. i get false positives from my AND gates
3. Sometimes the 555 outputs simply when i turn the circuit on?
I tried troubleshooting without success. Please help. Thankyou in advance