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Author need help with a small simple circuit
gtitim
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Registered: 13th Feb 05
Location: the boonies
User status: Offline
   18th Jan 09 at 19:14   View User's Profile U2U Member Reply With Quote
Need to make the following circuit work, but it wont:

12v +ve input - 12v LED - 1A diode -
12v +ve input - 12v LED - 1A diode -
12v +ve input - 12v LED - 1A diode - all 4 into common 2k resistor -ground
12v +ve input - 12v LED - 1A diode -

Wired it up but it didnt work when tested. Could i have blown the components when soldering by overheating?

Never built circuits before so struggling with it all.
ed
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Registered: 10th Sep 03
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18th Jan 09 at 19:34   View User's Profile U2U Member Reply With Quote
Did you use 12v LED's?
gtitim
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Registered: 13th Feb 05
Location: the boonies
User status: Offline
18th Jan 09 at 20:38   View User's Profile U2U Member Reply With Quote
yes - or at least thats what i asked for in maplin. will have to order some more parts and try again i think
Dan
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Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
18th Jan 09 at 20:42   View Garage View User's Profile U2U Member Reply With Quote
diodes the correct way around? wired the led the correct way?

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gtitim
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Registered: 13th Feb 05
Location: the boonies
User status: Offline
18th Jan 09 at 20:45   View User's Profile U2U Member Reply With Quote
yes - LED with short leg to -ve, diode with stripe to -ve, just think i must have burnt some of the diodes out with ham fisted soldering.
Dan
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Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
18th Jan 09 at 20:47   View Garage View User's Profile U2U Member Reply With Quote
got a multi meter? test the circuit

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gtitim
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Registered: 13th Feb 05
Location: the boonies
User status: Offline
18th Jan 09 at 20:53   View User's Profile U2U Member Reply With Quote
by putting 12v in and testing after each component i should be able to see if i have burnt something out?

the theory is that when the inlet on my car alters, it sends a 12v signal to the ecu, lighting the circuit and the LEDs

 
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