Turning on a 5v circuit with an 3.3v control signal (from a Raspberry PI)
87050
High-side switch 24V 6mA control by Arduino
2774
Stepping up 3V to 5V
68820
How to turn continuous signal into a short pulse using logic gates?
65365
How does USB Power Delivery work with voltages above 5V without damaging 5V peripherals?
78030
Triggering 12v Relay with HC-SR501 PIR sensor
37578
How to measure voltage of a floating GPIO (Raspberry Pi)
116678
How to simulate simple on/off, Single-Pole-Single-Throw switch?
20689
How to control switch mode power supply feedback voltage through optocoupler?
53976
How to connect an LED indicator to a circuit?
105529
Detecting state of LED to control another circuit
115593
How to measure line voltage (220V) with an arduino?
98480
Using 240v mains on/off as input to microcontroller
78779
How to use a Raspberry Pi Pin(3.3V) to reset a ATMEGA328(5V)
108482
Switch power supply/battery
134426
How do I convert, lower, or raise voltage?
45078
Shifting -5 V to +5 V signal to 0 to +5 V for ADC
118920
A switch that is only ON if the reference voltage is matched -+ 0.1 volts