Why drive a relay with a transistor switch?
120429
What is the point of the transistor to drive the relay coil
14112
Why would one drive LEDs with a common emitter?
83811
Relay to switch 50 lines at once?
5288
The role of a transistor in a magnetostrictive oscillator circuit
107150
How to prevent DC motor from dropping voltage of supply when switching on
49485
How to use a transistor to pull a pin low?
93985
Control 5v relay through 3.3v GPIO using NPN transistor
130659
When/why would you use a Zener diode as a flywheel diode (on the coil of a relay)?
148525
Why are relays so frequently driven by optocouplers?
5210
Why doesn't current flow in reverse biased diode?
116982
Why is there a diode connected in parallel to a relay coil?
102483
How does this wiring work?
152660
Why use a transistor for getting a Constant Current Source in a circuit with an op amp?
158149
Arduino with 5v Relay
124272
Why am I cooking MOSFETs?
86975
Purpose of the diode and capacitor in this motor circuit
126826
Should I run a relay continuously?