Alternator circuit - still not working. Why...
#1
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Hi Guys,
I just finished of my DIYPNP and made a stupid electronics rookie mistake.
I swapped the +/- sides of the big capacitor 25V 100uF and the thing went PLOPP!![facepalm](https://www.miataturbo.net/images/smilies/facepalm.gif)
Stupid bloody unnecessary mistake...
The DIYPNP works normal (re-flashed the firmware, loaded the MSQ, sent all the sensor calibrations.)
The alternator circuit though doesn't do what he is supposed to. What did I fry within the circuit?
![](https://www.miataturbo.net/forum/attachments/10105d1233855709-alternator.png)
Of course I changed the Cap to a new one with the right direction...
Thanks - Greets
the e-rookie
Sven
I just finished of my DIYPNP and made a stupid electronics rookie mistake.
I swapped the +/- sides of the big capacitor 25V 100uF and the thing went PLOPP!
![facepalm](https://www.miataturbo.net/images/smilies/facepalm.gif)
Stupid bloody unnecessary mistake...
The DIYPNP works normal (re-flashed the firmware, loaded the MSQ, sent all the sensor calibrations.)
The alternator circuit though doesn't do what he is supposed to. What did I fry within the circuit?
![](https://www.miataturbo.net/forum/attachments/10105d1233855709-alternator.png)
Of course I changed the Cap to a new one with the right direction...
Thanks - Greets
the e-rookie
Sven
Last edited by Zaphod; 10-27-2009 at 12:54 PM.
#2
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Nobody? I just need to now, what of the parts of the probably have been killed, that prevent the circuit from working.
The transistors? the 2 small capacitors? The resistors? All?
Thanks
The transistors? the 2 small capacitors? The resistors? All?
Thanks
#3
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I don't think the capacitor would cause something else to blow (except maybe a copper trace on the board because of too much current). If anything, the 2907's are a candidate so you might want to do a diode test on them. Clicky. First, I'd triple check if you built the circuit correctly though.
If you still have my circuit, you could compare voltages on different points of the circuit.
If you still have my circuit, you could compare voltages on different points of the circuit.
#4
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Thanks Frank, that is at least a hint.
I checked the circuit really careful and it should be correct.
I have enough parts to build another one - so I may build another one on a little piece of extra-board and test it first, then adapt it to the DIYPNP board.
I tested your board too (btw. you did forget to make one connection on the alternator circuit) and it should give me the hints, how the voltages should read.
Greets
I checked the circuit really careful and it should be correct.
I have enough parts to build another one - so I may build another one on a little piece of extra-board and test it first, then adapt it to the DIYPNP board.
I tested your board too (btw. you did forget to make one connection on the alternator circuit) and it should give me the hints, how the voltages should read.
Greets
#5
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Hi Frank and all,
I built a new little circuit (I copied your circuit 1:1).
When I have +12V and ground attached I get a similar voltage between the field and ground - varies with voltage input-higher input higher voltage at the field, also with lesser voltage.
But I cannot get a current reading (neither with your or my circuit - I know I already got a reading with yours) Am I doing something wrong?
Greets
I built a new little circuit (I copied your circuit 1:1).
When I have +12V and ground attached I get a similar voltage between the field and ground - varies with voltage input-higher input higher voltage at the field, also with lesser voltage.
But I cannot get a current reading (neither with your or my circuit - I know I already got a reading with yours) Am I doing something wrong?
Greets
#7
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Hi Frank and all,
I built a new little circuit (I copied your circuit 1:1).
When I have +12V and ground attached I get a similar voltage between the field and ground - varies with voltage input-higher input higher voltage at the field, also with lesser voltage.
But I cannot get a current reading (neither with your or my circuit - I know I already got a reading with yours) Am I doing something wrong?
Greets
I built a new little circuit (I copied your circuit 1:1).
When I have +12V and ground attached I get a similar voltage between the field and ground - varies with voltage input-higher input higher voltage at the field, also with lesser voltage.
But I cannot get a current reading (neither with your or my circuit - I know I already got a reading with yours) Am I doing something wrong?
Greets
#8
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I just tried your circuit with my laptops cable 19V - seems to work. No reading at the field.
I haven't got a adjustable power source.
Greets
Last edited by Zaphod; 10-27-2009 at 03:29 PM.
#10
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WTF? What should this be?
Oh, O.k. haha. See, I laughed. Now go play with yourself.
I seriously think this could be interesting for the DIYPNP 99-00 guys.
Oh, O.k. haha. See, I laughed. Now go play with yourself.
I seriously think this could be interesting for the DIYPNP 99-00 guys.
Last edited by Zaphod; 10-27-2009 at 03:52 PM.
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