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Transistor Driven Relay Switch – Mike's Electro Shack
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Relay Switch Circuit and Relay Switching Circuit
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Model Making How To: Transistor Driven Relay Switch - KiwiMill
diodes - Selecting a switching transistor for a 5V relay - Electrical Engineering Stack Exchange
Working of Transistor as a Switch - NPN and PNP Transistors
PNPTransistor based DC Relay Drive make | Triggering source (-)voltage | method-2 - YouTube
Simple Transistor relay circuit | Transistor as a switch - YouTube
