2 signal EFI circuit using MOSFET + 555 #4
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This is a great idea! One suggestion I would have would be to put some kind
of regulator on the power supply of the 555, as I have blown up many 555s
by connecting them directly to the automotive 12V rail.
Are you able to submit it as a fork or commit, or do I have to upload it
directly?
Best regards,
John
…On Thu, Mar 30, 2023 at 7:54 PM soupflood ***@***.***> wrote:
I built an EFI circuit using your electronic schematic, only I used a
MOSFET driven by a TL555 in the gate buffer mode.
I would like to send you the schematic I used for you to post it along
with your original one, so that other people can also use it if they want.
I already tested the circuit and it works okay.
Let me know what you think.
[image: 20230330_205102]
<https://user-images.githubusercontent.com/129473643/229011088-179e5b7c-79ab-49ed-bb07-b1b2b37865af.jpg>
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I don't know yet how to upload images the way you said; and I only have the image I attached. If you think the quality is good, then please upload it next to your original schematic. |
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Excellent, I just uploaded your design.
By the way, one thing that I found to work well was to add a piece of
copper mesh or foil over the top of the ATMega328p and its clock crystal,
and to solder this part to the USB port for grounding. After I did this,
the Arduino Nano was much more stable and gave less trouble with crashing.
I also removed the small 5V regulator on the back of the Nano, as I found
that after a couple months of driving, it randomly started short-circuiting
the 5V rail.
Best regards,
John
…On Sat, Apr 1, 2023 at 9:04 AM soupflood ***@***.***> wrote:
I don't know yet how to upload images the way you said; and I only have
the image I attached. If you think the quality is good, then please upload
it next to your original schematic.
About the 555: yes, it would be ideal to feed it through a proper 12V
regulator, however I don't currently have one laying around. The series
double diode - parallel double capacitor seems to have done the trick so
far because it still works okay. The 555 is supposed to handle up to 15V of
VCC, but if it will blow up I will of course consider getting one 12V
regulator installed.
I guess every car wiring is different; I rather had more problems with the
Arduino stability than with the 555: had to solder a 3uF ceramic capacitor
across the 5V regulator input's electrolytic capacitor, and replace the 10k
resistor leading to the points with a 5k one (just soldered another 10k in
parallel to it).
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Thank you for uploading it.
What I found to be useful so far, was to keep all Arduino related wires at
least one inch away from any spark wires. I guess that even if I screen it
like you suggested, it will still be bothered if its wires come too close
to the high voltage parts.
As far as the on board 5v regulator...I really hope it won't go bad because
I'm not even actually using it... And I've already soldered the Arduino
board to the "mother"board.
Take care.
El sáb., 1 de abr. de 2023 8:08 p. m., JohnPattersonConsulting <
***@***.***> escribió:
… Excellent, I just uploaded your design.
By the way, one thing that I found to work well was to add a piece of
copper mesh or foil over the top of the ATMega328p and its clock crystal,
and to solder this part to the USB port for grounding. After I did this,
the Arduino Nano was much more stable and gave less trouble with crashing.
I also removed the small 5V regulator on the back of the Nano, as I found
that after a couple months of driving, it randomly started short-circuiting
the 5V rail.
Best regards,
John
On Sat, Apr 1, 2023 at 9:04 AM soupflood ***@***.***> wrote:
> I don't know yet how to upload images the way you said; and I only have
> the image I attached. If you think the quality is good, then please
upload
> it next to your original schematic.
> About the 555: yes, it would be ideal to feed it through a proper 12V
> regulator, however I don't currently have one laying around. The series
> double diode - parallel double capacitor seems to have done the trick so
> far because it still works okay. The 555 is supposed to handle up to 15V
of
> VCC, but if it will blow up I will of course consider getting one 12V
> regulator installed.
> I guess every car wiring is different; I rather had more problems with
the
> Arduino stability than with the 555: had to solder a 3uF ceramic
capacitor
> across the 5V regulator input's electrolytic capacitor, and replace the
10k
> resistor leading to the points with a 5k one (just soldered another 10k
in
> parallel to it).
>
> —
> Reply to this email directly, view it on GitHub
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#4 (comment)
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I built an EFI circuit using your electronic schematic, only I used a MOSFET driven by a TL555 in the gate buffer mode.
I would like to send you the schematic I used for you to post it along with your original one, so that other people can also use it if they want. I already tested the circuit and it works okay.
Let me know what you think.
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