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Post by tom » Mon Jan 30, 2006 2:05 pm

1N4004.

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Toddman
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diodes

Post by Toddman » Mon Jan 30, 2006 2:06 pm

Just out of interest the lines that look darker than the rest coming from the diode symbols - are they for labelling or are they actaually part of the diode symbol?
If they are part of the symbol then it looks to me as if the diodes are Schottky Diodes, can't remember much about them other than they act as a normal diode upto a point then suffer "avalanche" breakdown.
Must admit I don't remember much about whay I am supposed to :D

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Post by sleepy0905 » Mon Jan 30, 2006 2:10 pm

Ok Tom i will have a look and see if i have some of them . :)
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Post by sleepy0905 » Mon Jan 30, 2006 2:12 pm

Ok tom i have a couple PM your address and i will send em to you.
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Post by tom » Mon Jan 30, 2006 2:21 pm

Thanks but there is no need, Sleepy. I'm an electronics engineer, which is why Bernie asked me in the first place. I have plenty of them myself.
Luke: the Schottky diode would not drop as many volts and while it is suitable for this application, it has a different symbol. That shown looks a little like a thyristor; but it isn't. My worry with all of this is that if the diode goes, the driver transisitor may go too but this has not happened on Bernie's car.

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Post by sleepy0905 » Mon Jan 30, 2006 2:27 pm

Oh ok sorry i will stick them back in the rack but i have a question for you do you know anyone who is after an oscilloscope as i am selling my spare one.
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Re: diodes

Post by bernie » Mon Jan 30, 2006 4:26 pm

Toddman wrote:Just out of interest the lines that look darker than the rest coming from the diode symbols - are they for labelling or are they actaually part of the diode symbol?
If they are part of the symbol then it looks to me as if the diodes are Schottky Diodes, can't remember much about them other than they act as a normal diode upto a point then suffer "avalanche" breakdown.
Must admit I don't remember much about whay I am supposed to :D

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Luke

The thick black lines are for labelling
The diode on the right is the original diode that has gone faulty and the one on the left is the new replacement.

The actual part is from my Xantia which has got hydractive2 suspension.
There are 2 of these, one front and one rear.
They are controlled by the HA2 ECU and control the valve that operates the HA block to allow the third sphere to enter the circuit.
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A LOVELY XANTIA HDI EXCLUSIVE ESTATE

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Post by bernie » Mon Jan 30, 2006 4:48 pm

tom wrote:1N4004.
I bought 10 of each of 5408, 4148 and 4409 to try.

What's the difference between them?
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diodes

Post by Toddman » Mon Jan 30, 2006 5:54 pm

Thanks Bernie and Tom - I did think the lines were for labelling but thought I would ask, no good not knowing what is going on :D

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Post by tom » Mon Jan 30, 2006 6:11 pm

4148 is a small signal device and will probably have died due to the back emf spike's current.
5408 is a 3A 1000V rectifier, tough but a little slow.
4409 I don't know but in this application, I'd stick with the
1N4004 which I know to be suitable.