in the below picture is a test method im trying to make it work
- if succeeded, I will implement it in my LED clock project
- I'm making a four 7 segment LED using 12V led strips as 3x3 bits for every segment
- The method to control the the segments is by using the 74595 shift register to call each LED
- and using the "high side" "low side" transistors as switch to call the LEDs
- by making a common among the LEDs (common cathode or anode)
Anyway, I have very little information to rely on and need an expert opinion. Is the circuit in the diagram correct?
If yes, how can I calculate the resistance value for R1, R2 , R3?
what are the power rating should I be using?
I used for the low side switch R3 = 300 Ω and for the high side switch R1 = R2 = 1 kΩ
But when I tried it, the Q2 transistor was getting really hot.
As for the Arduino code, a simple blink for the digital pin high and low states.