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After building the second suggestion by XNOX and it failing; transistor would not switch, I moved on to his third suggestion. Which works well.
Thanks very much for all your suggestions and help. I have learnt a few things about electronics.
My relay has the following serial number printed on its exterior: **broken link removed**
Thats DC 12v at 3A output.
The transistor I currently have is a **broken link removed**.
I think a **broken link removed** should do the job.
**broken link removed** contains the product range I can get...
Thanks for you ideas. How can I tell which transistor to use? I will peobably have to use an equivalent anyway as we don't get the same range as the USA.
I have attached my version of your diagram and I am wondering if you think it will still work. I have added the extra diodes to protect...
Well how does the signal from the door you want get through? Also the door switches do not have +12v running through them at any time. Just 0v GND (ground) and 12v GND. Perhaps I just don't understand your diagram properly. Could you explain it to me further?
Thanks for your ideas,
Simon
Alfa Romeos are available in most countries. FIATs have not been available here since the early 1970s. Anyway I could tell you a lot about the Italian car industry in Australia but that would get me no further towards a solution to this problem.
Even worse would be to get a FIAT Panda here...
Thanks. I will have to go and buy some 10k resistors tomorrow as I don't have any. Apart from the pull-up resistors can you see any other problems with the diagram?
I tried shorting the base leg of Q1 to GND and to +12v but it did not switch the relay, I was trying to simulate the output of...
That is the first thing I thought of, but you have forgotten one thing that would only work if all doors were open. Otherwise it would still be getting 12v GND from the other doors. So it would not detect 1 or 2 or 3 or 4, but just all or none.
That is why I used 4 relays in my circuit but it...
I am not sure why he hooked that 4.7k resistor to ground. I thought exactly the same thing as your thinking when I saw it. So I tried the circuit with and without the resister there. But it made no difference as I don't think the NOR gate was changing.
I too have edited my previous post.
Simon
pnp nor gate
Q1 is indead a PNP transistor.
What are pull up resistors?
From what I can tell the gate is not going to change because the inputs are not +V, but I am not sure? Can the 4002 gate be changed with a GND signal fed to the inputs?
I am getting quite lost as most of this is more...
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