Though relays and logic gates are different components, they work in a comparable way. In this article you can see how I converted a relay based schematic to a logic gates diagram.
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Car electric window circuit
This basic circuit may be useful to control a car electric window. The electric motor is controlled by two relays. Continue reading
Security alarm
This security alarm works by NE555 timers and EXOR logic gates. When the activation selector is open the circuit does not work because the IC2 output is high, then the Q12 collector turns off the Q3-Q4 transistors. Continue reading
The CD4017 counter
The CD4017 counter is an integrated circuit that switches on ten outputs one at a time, due to a clock signal on the input pin 14. The input pin 13 enables the clock signal, while the input pin 15 is supposed to reset the output condition. Continue reading
