Surf PI Micro Var. 1.00

[dbanner]

Im using such a thing, connecgted to a 14 V power supply: https://www.ebay.de/itm/Adjustable-D...605a%7Ciid%3A1

When i connect my board the voltage drops to 5 V. I have set 0.1A max current. I dont want to use the battery pack again. When i connect a 12V fan then i get the same result. The voltage falls when i adjust the maximum current to 0.1A.

This is a good power supply module, but what are you powering it off of? What happens if you connect the fan and try to increase the constant current limit.
I suspect that the voltage falls because you are limiting the current. Try increasing it until the voltage increases to 12 volts.

[dbanner]

My fan was a 12V DC fan from a Computer Power supply. It didnt work because it was wrong connected.
I also changed the faulty 14,5V power supply to a working one with 12V , 1A, which powers the current limiting module.

It is possible that it does not work with such low currents like 100mA.

First of all, you MUST do step by step troubleshooting in a logical sequence. The last of your worries is the power supply. The focus should be on troubleshooting the detector circuit, step by step.
That is why I recommended previously on removing the MOSFET as first step, so you don't have to worry about high voltage pulses or accidentally shorting and destroying it. Then you can check the status of the rail voltages and pulses from microcontroller and proceed further accordingly. You can use a standard 12volts battery pack consistent of 8AA alkaline batteries. Don't worry about limiting the current. Just hook up voltmeter to the batteries in order to monitor the voltage when you connect to the circuit. Remember to remove all chips before you connect the supply voltage. If the voltage drops low then disconnect immediately. You have a short. Proceed to look for short etc.
If the voltage remains stable, then put in microcontroller chip and reconnect the supply. If the voltage remains stable then look for rail +5, -5V. And so on.
You said previously that the circuit started to smoke(magic) then start by checking all the components on the board for damages, replacing ALL destroyed or damaged components as first step before proceeding.

[waltr]

Bench supplies can be a problem for electronics that draws high current pulses.

I use a 3 cell Pi-Po battery (sold to power model airplanes and quadcopters so rated for a very high output current). Then put a light bulb in series as a current limiter.
A common automotive tail light bulb (not LED) works well. Size the bulbs Wattage to the Peak Current, 24W bulb limits at 3-4Amps.

This makes using high current batteries safer.

Here is the info on building a llight bulb current limiter nick named "the smoke stopper".
https://www.rcgroups.com/forums/show...Stopper%C2%99-!

[BKY1337]

My fan was a 12V DC fan from a Computer Power supply. It didnt work because it was wrong connected.
I also changed the faulty 14,5V power supply to a working one with 12V , 1A, which powers the current limiting module.

It is possible that it does not work with such low currents like 100mA.

[Andi68]

The current must not be limited, the circuit draws the current it needs

[Tibuck19]

[QUOTE=BKY1337;251559]The voltage drops only with my faulty homemade bench power supply. I know that because i got the same problem with it when i connected a 12v fan. It does not turn the fan on with 12v.[QUOTE]

I did the same thing , I thought I had a DC fan and it turned out to be a AC fan since then I have problems with my bench top PS, when you fix yours lol Let me know what to change to fix mine please.

[BKY1337]

How do you limit your current?

[Andi68]

I take a 12V power supply, which brings a higher voltage, and connect it with a 12V voltage regulator

[BKY1337]

Im using such a thing, connecgted to a 14 V power supply: https://www.ebay.de/itm/Adjustable-D...605a%7Ciid%3A1

When i connect my board the voltage drops to 5 V. I have set 0.1A max current. I dont want to use the battery pack again. When i connect a 12V fan then i get the same result. The voltage falls when i adjust the maximum current to 0.1A.

[waltr]

These things happen all the time. Show me an engineer who never seen or smell magic smoke.

Too many times.
lol

[BKY1337]

I have thought this second .hex file is for led use only. But i only get the pulse with this one.
Now i know what destroyed my baracuda board. It was the same battery pack.

I need to repair my bench power supply first.

[dbanner]

Edit

[dbanner]

Thanks. I will do that tomorrow, because its late here.
I also have to say that i never had a problem with a voltage drop.

This was problem of my bench power supply. When i connected something then the voltage dropped there. Not at my board , and not with 8xAAA battery pack.
But this Battery pack delivered 22 Volts and destroyed my Circuit now. This is so frustrating.

These things happen all the time. Show me an engineer who never seen or smell magic smoke.
Anyways, 640 Hz pulse sounds like surf prf. So that's good. It means the pic is programmed successfully.
I won't bother asking you how you managed to get 22voltz out of 8AAA batteries..
You should really use simple laptop scope software to see pulses from pic. If you don't have proper scope then why not. Frequency is low enough for soundcard on PC. Just don't connect anywhere near to coil or MOSFET. You may need this for adjustments for samples 1 and 2 when you finally get circuit up and running. If you have oscilloscope then disregard last comment

[BKY1337]

Thanks. I will do that tomorrow, because its late here.
I also have to say that i never had a problem with a voltage drop.

This was problem of my bench power supply. When i connected something then the voltage dropped there. Not at my board , and not with 8xAAA battery pack.
But this Battery pack delivered 22 Volts and destroyed my Circuit now. This is so frustrating.

[waltr]

Simplify the trouble shooting.

Disconnect the coil and pull ALL the chips off.
Then apply power and measure at each chip for the correct Voltage. Measure across each chip
s Vcc to Vss and each Vcc & Vss to ground.

If you still have the Voltage drop then look for a solder short.

If Voltages ok then put in just the PIC and check that pin 13, the pulses to the TX are correct with your O'scope.
Now check with O'scope across the damping R (without coil). This should show the TX pulse.

If still ok then put one chip at a time back in starting with the pre-amp and work toward the PIC's ADC input (OP1 then OP2).

Re-check that every chip is installed correctly and not backwards (easy to do).