Turning on LED panel with a NPN transistor
93379
Using NPN transistor as switch
108136
Is there a way to control the PWM duty cycle of a 555 timer without using a variable resistor?
74135
NPN circuit to switch 12v 1A DC load by 3.3v 1A DC using PIR
74151
Changing LED color for notifications
25522
Low battery level circuit - Changing "trigger" level
111889
led resistor calculation, and resistor wattage?
120233
Adding a new switch with an independent light in an existing circuit
30292
How do I calculate the resistor value for a simple LED circuit?
76832
Powering 16 meter LED strip
151478
Calculating resistor for LEDs with different Forward Voltages in series
129382
LED light fixture glows when not turned on
129278
simple, energy efficient circuit to make single IR LED blink
139642
Water level indicator with PNP transistor
125392
Is LED properly implemented in the constant current circuit?
104680
How do you turn on and off a monitor from within a Java application?
92681
Controlling Two Circuits with One Switch
30138
How can I install this programmable switch where a neutral is not present?