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Topic: SOLVED !! internals of the auto lamp module (Read 15256 times) previous topic - next topic

SOLVED !! internals of the auto lamp module

Reply #105 –
Yes for Q1 I used a 2n2222

I'll need some time just stew over your diagrams but they look very intriguing and thank you for the diode layout. I didn't think about adding the second diode the way you have it done and it should be the best way
 

SOLVED !! internals of the auto lamp module

Reply #106 –
Isn't the diode you have shown on the relay output backwards?
Doing so would allow power to leave the module but not allow power to come backwards into the module on the middle wire

SOLVED !! internals of the auto lamp module

Reply #108 –
Just catching up went through this whole topic.  Very interesting albeit confusing at times.  ;) Great job Trinom, I'm a believer in the diodes too when it comes to circuits like this.

I am a bit confused about D3 in the output stage, if you are talking conventional current flow it's backwards, if electron flow it's OK but then D1 is keeping REL pulled up to 12v all the time.
Am I missing something?

Great tutorial on troubleshooting!
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SOLVED !! internals of the auto lamp module

Reply #109 –
Not really sure how to answer that question

SOLVED !! internals of the auto lamp module

Reply #110 –
D1 is connected between rellay output and battery voltage. I guess, it is connected this way, because if the voltage on the relay output is higher, than on the battery, it means, that there is some problem and this diode opens. I think it's a sort of protection, but it's another kind, than traditional antiparallel diode which I meantioned earlier.

D3, or even the whole end stage between output of the NOR gates and Q1 is a piece of mystery. I think I know, how does it work and why, but I'm not definitely sure how to explain it properly.