Hi sorry for my delay away at work. I connect the 24v PSU the bulb lights strait away but very dimly. Please let me know ware you want me to take the reading. I will take pic of my completed board and post.

Sorry for my constant editing on this forum still working out the size for the pics.

The only possible problem I see is that the 1k resistor color code seems wrong.
Are you sure your magnet strength is at least 55G?
This may sound like a stupid question, but have you measured your supply voltage with the circuit connected?
Measure the voltage from pin 3 on the 3245 to GND when the magnet is removed, and when it is applied. The voltage should change from ~24V to ~0V. If this works, measure the voltage from the gate of the MOSFET to GND under the same conditions. It should change from 24V to ~14V.

 

As Ron H noted, if the 1k resistor has a color code of brown, black, orange - it is a 10k resistor, not a 1k resistor. That would cause the power MOSFET to only slightly conduct, and it would get warm rather quickly if there was much of a load.

A few other things:
1) There needs to be a 0.1uF (or 100nF) capacitor, ceramic, poly or tantalum, across the power terminals of the A3245EUA Hall-effect sensor. Otherwise, it will not be stable, and may switch on and off rapidly. This would cause the MOSFET to heat rapidly. See the attached for where to connect the capacitor.

2) The trace between the - terminals from the source to the load is very thin. If you attempt to power much of a load, the trace will be vaporized. You could solder on a piece of heavy-gauge wire or a piece of flat copper stock to improve the current handling capability of the trace. See the attached.

3) The ground for the A3245EUA is on the load side of the aforementioned narrow trace. This may cause the power applied to the A3245EUA to fluctuate a great deal. If the aforementioned trace is widened a great deal, this should not present as much of a problem. Ideally, it should be connected where the supply ground is connected to the board.

4) If the wires leading to the board from the power supply are of large gauge and not more than 6 inches long, you won't need bypass capacitors on the board. However, if they are longer than 6 inches, you should have several capacitors connected across the 24v input, soldered to the board. I'll suggest 0.1uF, 10uF, and 470uF. This will help a great deal to smooth out transients. These are not shown on the attached, but if you are unsure, I will mark it up.

 

I'm colorblind, but the 1k looks to me like black-brown-red, when it should be brown-black-red. Am I reading it wrong?

 

I'm colorblind, but the 1k looks to me like black-brown-red, when it should be brown-black-red. Am I reading it wrong?

Actually, his original drawing shows Black-Brown-Orange. I didn't notice the mixed-up black-brown the first time around; the orange threw me off. They don't mark resistors like that nowadays that I know of.

It SHOULD be brown-black-red, unless perhaps the OP is using really old and non-standard marked resistors.

OK, I've made that change on this version - and also added in the 3 caps across the input.

[eta]
If the traces on the separate MOSFET board are indeed that thin, they will also be vaporized when a load more than a couple of Amperes is applied. The trace to the gate can be thin, but the source and drain need to be quite beefy.

 

Actually, his original drawing shows Black-Brown-Orange. I didn't notice the mixed-up black-brown the first time around; the orange threw me off. They don't mark resistors like that nowadays that I know of.

It SHOULD be brown-black-red, unless perhaps the OP is using really old and non-standard marked resistors.

OK, I've made that change on this version - and also added in the 3 caps across the input.

[eta]
If the traces on the separate MOSFET board are indeed that thin, they will also be vaporized when a load more than a couple of Amperes is applied. The trace to the gate can be thin, but the source and drain need to be quite beefy.

I noticed the black-brown-orange on the original drawing, which is why I noted the discrepancy. Ron said

I will take pic of my completed board and post.

He obviously either did not, or modified it before posting. I think a picture would be more informative. You can draw what you think you have, and it might not reflect wiring or component errors.

 

Sorry for the extended delay in replying, been working away at sea. Wife as been checking on the forum for me.
You are correct Ron H when you say you can draw what you think you have, that’s what I did and it was wrong went back checked it all found I had wired it all wrong put It right and all working now.
So many thanks to all.

I do have a new question about mosfets:

1. If I was going to use an N channel instead of a P channel will the resistor calculation remain the same.
2. Is there a formula for calculating the gate resistance (Rg) for Mosfets?

I’ve built a PWM based on a NE555 timer and I need to get from the output of the 555 pin3 to IRF3710.
I have been reading some of the posts on this forum by Farlander (WFC Water Fuel Cell by Farlander)
And seen one of his modified diagrams of stanley meyers.

and was going to use the mosfet part only as I have built my PWM but I’m using a transistor and want to use a mosfet. Any help please.

 

It's a very late note, but the 21.5K resistor in post 41 has a color code for 1.5K in the 5% tables.
21.5K is a 1% value, colors red-black-green-red.

For question #2, the parameter is gate capacitance, given on the device spec sheet.

 

The resistor in post 41 is R2 and that is a 1.5k not 21.5K, so it will be drown, green. Red, gold at 5%.

Sorry but I’m new to MOSFET world. So would the R1 and R2 in post 46 be correct.

 

For question #2, the parameter is gate capacitance, given on the device spec sheet.

He was asking about gate resistance. I think he means the value of the series resistor.

47 ohms (R1), as shown in the schematic, should be fine.
R2 is not necessary unless you plan to remove the 555. Then it will help protect the MOSFET from damage due to static discharge.

 

Thanks Ron H and to everyone that as helped. I’ve completed the work for all the questions for the topic regarding post 21 and many thanks again.

 

Did adding HHO to your car's engine burn the valves and pistons?
Did it decrease the fuel economy?
Did it fail the emissions test due to a very high NOX?

 

Run a small HHO sell about 1 to 2 liter a minute on the car for just over 5000 miles the engine is 800cc no valve or any other problems. Rebuilt the engine after the first HHO test went very wrong (it stopped running parked it up for about 2 month’s it gave the symptoms of being seized up, stripped down to find water in engine.) Will be stripping back down at 10,000 miles to see if any problems.
Before HHO car was averaging 45 mpg with HHO averaging 63 mpg.


Exhaust emission test without HHO switched on.
The car had done about 50 miles without HHO on just for the test.

Test1 2500-3000rpm
CO Pass 0.22% 0.30MAX
HC Pass 180ppm 200MAX
Test2 2500-3000rpm
CO Pass 0.18% 0.30MAX
HC Pass 129ppm 200MAX
Idle Test 450-1500rpm
CO Pass 0.20% 0.50MAX

Exhaust emission test with HHO switched on.
Before the retest tuck the car out for about 50 miles with HHO running for the test.

Test1 2500-3000rpm
CO Pass 0.16% 0.30MAX
HC Pass 178ppm 200MAX
Test2 2500-3000rpm
CO Pass 0.15% 0.30MAX
HC Pass 122ppm 200MAX
Idle Test 450-1500rpm
CO Pass 0.19% 0.50MAX


Just a note: it’s developing problems starting now think it’s water / condensation /vapor on plugs but with past experience I know if I don’t start this car once a day it will seize up. (Rust in barrels)
Also I do use oxygen / hydrogen splitter and only feed hydrogen in to the engine also use a variable PSU controlled by throttle (more current supplied to the sell when given more throttle, helps battery longevity on short trips)

Sorry for the long replies to your questions.

 

An important pollutant was missed on your emissions tests. It is Nitrogen Oxide (NOX) that is produced when an engine runs lean because somebody fooled around with the engine.
Usually HHO causes the mixture too be too lean which creates a lot of NOX pollution and burns the valves and pistons.

Is it smart to burn the valves and pistons and make air pollution by running lean with HHO? Does it save money?

1 to 2 liters per minute is nothing for a tiny lawn mower engine. Do you drive one of those cheap little Indian Nano cars? A real car would use a few liters per second of air-fuel mixture.

 

Canada is large so they have room for large roads that means they can have big cars and how much is your gas.
UK is over populated small roads, so we have to have small cars.
The last time I looked your gas per gallon was about the same price we have to pay for a liter in the UK.
So maybe if everyone stopped using fuel guzzlers it would bring the price down globally then we would not have to play around with HHO and alike.
I think 800cc would have given away the size of the car.
I do understand NOX but it’s past a VOSA MOT at one of their stations.
Do you think they would allow anyone to drive out of one of their stations if the emissions didn’t meat the legal regulations? Never mind what they would do to the driver, hence for the too tests, just so if I got stopped I could prove that it was all above board and was installed and running on HHO on the MOT day. Also to prove I’m not just one of then chaps that take the HHO out for the MOT then puts it back when it’s past. I haven’t just hacked my car together to save a £1 or 2 and bugger the environment and when it goes wrong it’s every ones fault but theirs, if you don’t set things up correctly it will trash the car.

All theorists theorize about there theories not many do anything with there theorise except gossip about theories.

 

Canada is large so they have room for large roads that means they can have big cars and how much is your gas.

We have huge truck/cars and tiny Smart cars.
Our gas costs half or 1/3 what you pay. Your gas taxes are way too high.

UK is over populated small roads, so we have to have small cars.

No you don't. The Land Rover is a pretty big gas-guzzling truck and they are also here.

The last time I looked your gas per gallon was about the same price we have to pay for a liter in the UK.

Yesterday a liter of regular gas (87 octane) was $0.85CAN which is only 0.48 pounds sterling. Today it went up a little. Your government is ripping you off!

So maybe if everyone stopped using fuel guzzlers it would bring the price down globally then we would not have to play around with HHO and alike.

I doubt it. They charge as much as they can and the governments get a percentage so they won't reduce the cost.

I think 800cc would have given away the size of the car.

Hee, hee. Do you drive a little lawn mower?
The engine in my car is very small but is almost 3 times the size of yours.

I do understand NOX but it’s past a VOSA MOT at one of their stations.
Do you think they would allow anyone to drive out of one of their stations if the emissions didn’t meat the legal regulations?

They first look at the emissions control parts and fail the car if they see that it is modified. They will see your HHO modifications and will fail your car.

Rich school kids here drive cars that have no emission controls so they pollute and stink. No mufflers and the cars are lowered and have black glass. Their friend mechanic "passed" them.

 

Depending on the cost of a new engine annually, the extra mileage might be worth it. Socialist governments need a lot of money. They are talking about taxing our gas back over $3/gallon here since they found out consumers paid that much before.

 

They first look at the emissions control parts and fail the car if they see that it is modified. They will see your HHO modifications and will fail your car.
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Not in the UK theirs not much legislation covering mod.s as a private builder and not for the type of mod were discussing some cars and bikes have Nitrous fitted and it’s street legal. One of my bikes is a street fighter heavily modified with turbo and Nitrous Oxide and it’s street legal. Have a look on the net you will see the things we in the UK get up to. I also have a large commercial vehicle that is MOT and road tax exempt including emissions under the fixed load rules (self exemption). Has long has the vehicle meats all the standers a private user can do almost any thing with a car especially if registered before 1990. I do except we have some mod rules but if one knows what one is doing most can be side stepped.