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Using A Transistor To Change Polarity

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Member - Posts: 6
Member spacespace
Joined: April 07, 2015
Location: Oregon, United States
Posted: October 29, 2022 at 3:42 PM / IP Logged Link to Post Post Reply Quote blacklion62
Hello. My bank of relays are all wired for negative triggers. I recently came across a YouTube video to use a SPDT switch to either switch LED Pods reverse lights on with the stock lights, or to turn them on manually. However, the circuit uses the +12 wire from the stock backup lights to drive the LED Pods, switchinng the positive. I really don't want to run another relay just to switch the polarity. I know a NPN transistor would do the job. I need to know which transistor to use, and a diagram to hook it up. +12V switching -12V, to send a negative trigger signal to the LED Pods relay.
Thank you all for your help.
Platinum - Posts: 1,366
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: October 30, 2022 at 4:07 PM / IP Logged Link to Post Post Reply Quote Ween
This should help...

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