Surf PI Micro Var. 1.00

[BKY1337]

The board is dead now. I forgto the battery connected to the board and i saw a little bit smoke.

The battery pack had 22 Volts when i measured the voltage. I dont understand why.

Pic programming works now, even with verify.

[BKY1337]

Pulse is 0.64kHz at Pin 13 with DMM and led.hex file.
I dont get a pulse with the other hex file.

[dbanner]

The trim is for samples, nothing to do with -5v supply. I suspect your pic isn't programmed. Maybe Chinese programmer have little problem with some pic chips. Do some googling of China pickit and your chip to see what others have to say.

[BKY1337]

Ok, i will carry on tomorrow. I used a pickit 3.5 (China clone). I had to set the input voltage to 4,75 instead of 5 Volts.
Also the verify operation does not work. But i dont think that this causes my problem.

I will also try to measure the pulse from the pic.

[dbanner]

Check D1,D2,D3,C2,C5 for proper orientation. Here is where-5v is derived, with pulse from pic. Maybe pic not programmed proper. No pulse from pic, then cannot generate invert voltage -5v.

[BKY1337]

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.

I dont have a voltage drop with 8x AAA batteries.

Schematic is here:

I dont have a led at the board and no vibro motor.

I think i also need to adjust the trimmer but i dont know which pin and which voltage.
Was it PIN6 ?

I dont want to remove something now because i damaged my baracuda when i desolderd the mosfet.

I think the main problem is the negative voltage. Can you tell me where it is generated?

I can hear the clear sound of the microcontroller when i connect the battery and when i disconnect it.

I maybe accidently connected plus and minus (battery connector) at the board when i tried to measure minus voltage.
The steady sound disappered after that. I also had one probe at plus and one at the minus voltage testpoint.

[dbanner]

Remove the MOSFET, then check again voltages+5,-5v. Check pin 13 of chip on scope. Check at collectors of t3 t4. It could be that the pic micro is not programmed proper. You should see the drive pulse from pic at t3 t4 on scope. If no drive pulse then you will not get -5v either. Check components d1,d2,d3,c2,c5 for correct orientation on pcb. If you cannot connect the 12v supply to circuit without it dropping low, then you have a short somewhere that's pulling down the voltage. You'd have to remove the pic at this stage and all other chips. You must first have 12 v supply established as matter of fact before anything else.
With all chips removed, you should get +5v and 12v but not -5v. If you have these voltages, then install the pic chip. Recheck voltages.
Just some hints to help you isolate the problem. Good luck

[dbanner]

Your circuit may have a short somewhere.the supply voltage should be steady and should not drop so low when connected to circuit. Isolate the part of the circuit responsible for the power supply. If battery voltage still drops, then the problem is in that part of the circuit. Is there a schematic?

[BKY1337]

I tried the other hex file and i got a steady sound with it.
One problem was my power source. It drops to 3-5 Volts when i connect something.
I decided to use a 12 Battery and i got the same sound when i disconnected the battery. I think it is the low battery sound.

+5 Testpoint is 5,9V
-5 Testpoint is 1,6V

I used my Baracuda coil (330uH).

After a few tries the steady sound disappeared.

[BKY1337]

I finished my board and tried it with the 676.hex file.
I can hear an error sound when i connect power. I have no clue how i could tune the board.
Maybe my power source is faulty because the voltage drops to 5 V when i connect the board.
I have adjusted maximum current to 0,1A and voltage is at 12 Volts.

[BKY1337]

[BKY1337]

PM sent.

[Tibuck19]

Yes , its possible. I have PIC16F676 too.

Id like one also, if you would include a programed pic with it.

[BKY1337]

Can i replace the 100n poly caps with ceramics? I forgot to order them.

I also can not find a 470u electrolytic capacitor with pin spacing 4mm.

[kt315]

this one transistor set for the speaker. because a speaker is need in power/current, while piezo electric is not, only voltage.
thats why the piezo connected to PIC's pin directly.