arduino - Switching Relay with NPN and PNP transistors - Electrical Engineering Stack Exchange
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NPN Relay driver circuit | PNP transistor as switch |PNP Vs NPN | Difference between npn and pnp - YouTube
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8-ways DC-12V 16A PNP 1-NO/1-NC Relay Driver Dashboard Module Servo C45 DIN PLC | eBay
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Please explain the purpose of the marked resistors and diode in this transistor relay driver circuit - Electrical Engineering Stack Exchange
Electronic Relay Switch Circuit - NPN, PNP, N & P Channel
Using PNP transistor as a swichto drive a relay | Forum for Electronics
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3.3V 1-Channel Relay Driver Module Photoelectric Isolation Input NPN/PNP | eBay
