I am trying to build a simple circuit where a NPN transistor switches a relay.
my input is coming from an infrared photo-transistor.
My problem is the NPN (2n2222), passes 9.4v and relay engages with out any V+ on the base. When i apply a voltage to the base i get the full 12V out.
I have read for hours, including the tutorials on this site and think i understand this, but apparently i am missing something.
Any help would be greatly appreciated.
Thank you in advance for sharing your wisdom.
- James
my input is coming from an infrared photo-transistor.
My problem is the NPN (2n2222), passes 9.4v and relay engages with out any V+ on the base. When i apply a voltage to the base i get the full 12V out.
I have read for hours, including the tutorials on this site and think i understand this, but apparently i am missing something.
Any help would be greatly appreciated.
Thank you in advance for sharing your wisdom.
- James