Fuel injector tester with 555 timer chips

This is a build of a pulsed fuel injector tester I made using the popular 555 timer chip. There's a project page on my website www.dinofab.com/projects.html.

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Автор 10vtHolsetHybrid (7 месяцев)
This is a really cool project, one I've been meaning to build for a while;
I have been getting into electronics through my job and my megasquirted
Audi. I have a question about the monostable circuit. Is the timer
started over every time you let go of the button and push it again, so that
if you kept pushing the button before it timed out you could just keep the
circuit on, or does it need to count all the way out?

Автор Juanra Rubio (5 месяцев)
may you drive 4 injectors at a time with that mosfet?, or will it be

Автор Si Siddy (3 месяца)
Is it possible to use pots instead of regular resistors so you can use a
dial to change the duration and duty cycle?

Автор Curt D (8 месяцев)
Did you put a diode in parellel with the mosfet drain and source terminals?
If not that inductive load of a relay or fuel injector will probably fry
the mosfet?

Автор MrCarzonekit (8 месяцев)
Thanks you..

Автор marek0086 (1 месяц)
.008 mS pulse width??.... i find that hard to believe!.

Автор Dean Segovis (1 год)
That is why the 1N4742 diode is in the circuit. It protects the MOSFET from
the back EMF voltage. Check out the schematic on the DinoFab project page.
Just Google "DinoFab projects" and look for the fuel injector tester.

Автор steven keyes (1 год)
hi could you test a piezo injector with this and a diesel presure pump

Автор branda12on (3 года)
i see u like makershed ;)

Автор Don Bishop (3 года)
Great info! Thanks:) Don

Автор Clifton Jamison (1 год)
Dean you did a fine job,your a meticulous type of guy like me.So I like
your style.One question.Can you substitue the fixed resistors and cap.with
variable ones?Or I guess you could put a rotary switch with a config. of
cap.&resistors to change the pulse width.I just learned a lot about stuff
from your video!Thanks so much Dean,I'll check out your site. Skip J. in

Автор pcars (2 года)
Judging by the rest of your videos, as well as this one, it is clear to see
that you have a strong grasp on the 555 timer's inner workings. I would
love to see a video with your viewpoint on how a monostable and astable
timer actually works; r-s flip/flop, voltage divider, etc. There are just
not enough quality videos like this on youtube.

Автор l bond (1 год)
Hi Dean. First of all thank your for sharing some of your information. I
really appreciate it. Do you have an oscilloscope now? email me

Автор skourkos crew (1 год)
power of simplicity.Great video sir...thanks for sharing. Not many people
need and use their "inventions" in everyday life.

Автор Luqman60100 (3 года)
cont. The circuitry in your video really opened up some ideas for me. At
least if I tried out your circuit, I can reduced the number of components
used. btw, its very nice being able to find this vid.

Автор Adam A (1 год)
dude, you knew one before the other as well... and you could have answered
his question in less time than you spent on that comment

Автор nissenauto (3 года)
Nice job Dino! Rob N.

Автор robertsulley (3 года)
4:20 39ms on + 32ms off = 71ms 1000ms per second... ie 1000 / 71 = 14 pulses

Автор milionaru89 (1 год)
When a coil is cut from power the magnetic field colapses and it sends a
lot of volts to its terminals, is that not afecting the MOSFET?

Автор Tobots Wholesale (1 год)
hahah Hi Dean, well done bro, i starting to get into this, i have wired old
motorbikes, fixed many little issues with wiring on vehicles, but i got to
say this type of stuff is blowing my mind away, will you go back over the
project and make a PCB board for it?

Автор Dean Segovis (1 год)
Yes.. got a Tek 453

Автор Petawatt (3 года)
Nicely done. I was hoping to see an injector pulsed though. You need to
simulate a pressurized fuel rail and then use maybe a glass mayo jar so you
can observe the fuel spray, right? Fooling with a toyota fuel rail, I found
that if you really need to reuse those crush washers, it's best to heat
them up in the flame of a propane torch and either quench them or set them
aside to cool (copper softens upon heating and hardens by being "worked")

Автор xgrapher (1 год)
You actually knew about all the magnetic field collapse theory and didn't
know about the diode solution? Can't believe it!

Автор edwin salas (8 месяцев)
good job very good job mi freen.

Автор felipe peixinho (1 год)
555 beautiful project the best circuit invented until today

Автор emaglott (3 года)
very good! saw a link to this on the vw vanagon email list.

Автор getreal155 (1 год)
Wonderful video and incredibly well put. Thanks a lot.

Автор Ales Zupanc (2 года)
You have to try eagle cadsoft 5.11.0 or 6.0.0 or 6.1.0

Автор milionaru89 (1 год)
Pretty funny right?:))

Автор Edgar Miranda (1 год)
work for diferent kinds of inyectors? por example, denso, bosh etc?

Автор Iseekoutthetruth (3 года)
very cool idea

Автор Luqman60100 (3 года)
dinomaui: Impressive, can we change the pulse width? Maybe by replacing the
resistors with a potentiometer? I am currently doing a research project for
my masters degree. The topic is on the development of an ECU for a single
cylinder engine. Right now, the ECU that I have made is a mess. The system
doesn't respond to the throttle position sensor (i.e potentiometer).
Furthermore, when running the engine, it was revving dangerously high.

Автор wael alabrouni (8 месяцев)
good job

Автор GUSTAVO SOLIS (1 год)

Автор fatima dngle (1 год)

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