Electronic Fuel Injector Simulator for Injector Cleaning

i have a passion about automobiles . and when i work on engines or tuning it is harder to clean efi systems . rather than carburate system was easy and simple to tune and clean . so it is better for make some actuate the efi when it clean with automatically

1. Big crocodile clips
2. Small crocodile clips
3. Amp wire 2 m
4. 3 glands
5. Two pole switch
6. Encloser
7. Copper clad board
8. Ferric Chloride
9. Dremel
10. Drill
11. Soldering iron
12. Solder
13. Resistors 320x3 20k 10k 1kx4
14. Capacitors 10uf ,1000uf
15. Potentiometers 5k and 10k
16. NE555x2
17. Red LED x3
18. 1N4007 Diodes 3
19. Terminals x3
20. BC547
21. IRF9540N
22. IRF540N

first thing is make a design a electronic circuit that accomplish the task first thing is done by me is find circuits that creat need duty cycle and delay timer . then need to find a way to producing high current to the out put . lastly find a way to safe way to prevent revers polarity and over current situations

i used the irf540n to provide sufficient current to EFI to operate correctly it use as a switch and provide plenty of current to activate 12V fuel injector as duty cycle can go

using irf9540 to prevent revers polarity is great way to doing it. it provide good protection and efficiency if we think about single diode or stocky diode protection . i accept that is not fully tune to full efficacy but i think in a operation it wont matter . however as overcurrent protection i use fast blowing fuse .it easy to use and quickly repairable . and also two pole switch used to power on the device .because if we use on 12V car battery it may be sit on vehicle body, it may be earth or short circuit with battery. we have to use every countermeasure for safety of personal who use the tool

i use easyEDA to design the PCB and use old chemical etching technique to make a PCB. i had hard time doing it because use lower grade copper board fist you have to make print and transfer carbon to PCB and etching it . be care full to avoid etching more than want to. if not check the copper board it will be beyond repair