5 Volt Reference Simulator
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- Опубліковано 24 сер 2024
- 5 Volt Reference Simulator
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NOTE: Part are available from Jameco, Mouser & Digi-Key, with part numbers and details of construction available inside our publication (book & DVD) for this series.
Almost all sensor circuits on a modern automobile operate on 5 volts reference. A few other crank and CAM sensors do work on 7 and 8 volts, but these are the very few. The 5 volt reference feeds the throttle position, MAP, CAM and crank, wheel speed and vehicle speed sensors, just to name a few. Often times the ECM 5 volt reference circuit either shorts out or simply gets damaged. When this happens, all the sensors are rendered inoperative. The result is that the ECM issues a multitude of codes related to all the sensors, when in fact it's the 5 volt reference that one with the real issue.
The 5 volt reference simulator gadget seen here, is a small device, and fit for any automotive diagnostic thrown at it. You use it in place of the 5 volt reference. The 5 volt reference can be down due to an ECM circuit faulty, or because a sensor is shorted, also taking down the 5 volt reference.
Here's how this gadget works.
Get the whole story right here in this video... Enjoy
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You always need a resistor to drop voltage. If there were no 50 and 1M resistors, then it'll be open voltage. In case of a short, then chip will also short. 50 Ohm is a current limiter (short restrictor). 1M resistor is meant to be able to test CAM and Crank sensors, as you'll on the next video. Remember, Hall-Effect sensors operate by shorting 5 volt reference to ground, creating the square wave, which is an input to the ECM... Thanks for posting.
Well no, a fuse is not needed. The output is meant to be shorted for certain tests. As you'll see in the next video, when testing a crank sensor (Hall-Effect) you short the 5 volt output to create the square wave.
A variable DC supply is not a good idea for automotive diagnostics, since it'll short circuit easily. This gadget is meant to be shorted if needed. The two resistors and the 7805 can more than handle a short to ground. Stay tuned for the next video...
I love your UA-cam handle "halleffect1". That's great news. I want people to try these gadgets. They can save you lots of money if have use for them. In many ways, the DIY guys are ahead of the pack, even technology wise. Wait till you see the next gadget on this series. Thanks for posting.
I forgot that line about Europa, ha ha.
A small fuse might be a useful addition. Presumably you are confident that it will never have significant current, but if the sensor is bad that assumption may not be accurate.
This looks like an easy and fun project for another day. One day I want to make or buy a variable DC power supply, which would be a little more versatile than this. Thanks for posting!
Ok, the two capacitors are there to smooth out the output ripple, if any. Not absolutely necessary, but useful. No, No, No... The 7805 is the regulator. It takes 8 to 24 volts and outputs 5 volts (regulated or steady). The 50 Ohm is a current limiter, max. at 252mA. The 1M drops the 5 volts. You'll see it's usefulness in the next video on how to use. Connect resistors as seen in diagram. No PC Board needed, just join and solder wires, heat shrink and encase in enclosure. Hope that helped.
nice video.
i'm gonna order the parts and build one!
You know what, yes... The 7805 has an input range voltage of 5 to 24 volts. The output is always 5 volts steady, or regulated. So in theory you could use a 9V battery. I don't encourage what you want to do, which is have one gadget or piece of equipment that you can use with other gadgets. The problem, which I've seen many times, is that interconnecting devices leads to errors in measurements. You cross a wire by mistake and think it's a car issue. So, be careful. Thanks for posting.
This is what I was trying to accomplish with the low pressure sensor gadget, build it in a box with a led power indicator and an on/off switch.. Then it could be used with multiple press. sensors and any time I need a 5v ref. Can this device be used with the low pressure sensor? Can it be constructed to use the 9v batt instead of hooking to the vehicle batt?
i have followed the wiring diagram as explained , my problem is why when using the diode it increases the output voltage to 5.75v without diode it measures 5.02v
Excellent
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thanks much. if 7805 is outputing 5 volts, then why do we need 1 M ohm resistor .to drop once again 5v. in otherwords will not be zero now..
hi, what is the use of capacitor in this circuit?
50 ohm and 1 mega ohm is connected in paralle or series ?. if it is serieal then 50 ohm + 1 mega ohm both together reduce 12v to 5 v pls advise.
I want to add a signal wire that goes from the sensor to a bnc connector on the 5vref box, do I need to add any protection to the circuit?
Well just put a 200 Ohm resistor in series with the 5 volt reference for protection...autodiagnosticsandpublishing.com/
What is the purpose of the 0.1 uF microfarad capacitor? Thanks......
Everything is clear except for the Bias Diode connected to ground. What type is it or what's its value so I can buy it at the parts store?
It's in the book. You need to experiment a bit though. That's the idea behind the MOYDE book.
i bought the book and can't find a listing ?
what a shame that you have used a silly echoing voice on this video!! 🤔
No echo. Check you PC.
thank you
Ok
I ran this circuit thru a simulator and the output was 6.09 volts instead of 5. I ran from 8v to 15 volts at the input of the mc7805, but the result did not change. Is this acceptable?
MC7805 the 05 means 5 volts. Either your 7805 is faulty or your meter is.