help for delta P.

[okantex]

Hi
I used 12v 45Ah car battery for test.
also used 1100miccrohenry D=5cm small coil,ırf840 ,vu meter, and 0.5W 8ohm speaker.
rest are same with kt315 's list.

first I hear sound like door creak .(tik tik ) it continues something like 10 seconds .then stops .and when I put metal (it was iron) infront of coil ,I got no sound.

when I repeat process.I mean close and open detector .same thing happens again.
I controlled coil .it is ok mechanically. but not sure for tx signal .
where is the problem
I connected 555's 2. & 6. pins.

And on vu meter there is + and - inputs.where must I connect them.which one is jp1 (+ or -)

[Ahmad_Mohammadi]

PCB

Which PCB do you use?
The treiti's PCB(old version) has some errors...

[okantex]

I use the one that kt315 gave to forum.
you know .he gave component list and pcb layout.
I know people who used them successfully.

can tset point be used to find error with ampermeter.

[ivconic]

Sis kebab !!!



Okan, friend;
first check have you connected top and bottom sides of pcb on few points?
There is at least one important point that must be connected !
According to your story it looks like there is no connection to RX input?
So LF357 doesnt get any signal; it is because one point (i forgot right now designator and dont have schematic by me) must be connected through hole from bottom to top layer, i usually use plain wire and solder both sides.
I suppose your pcb is not metalised (like mine) so you have to connect all holes manually....
If not that, than try to follow signal from coil to LF357 to see where is missing.... or maybe LF357 is already blowed?
Try those and than come back here and report...
best regards!

[ivconic]

Check those..


Check those : TR4,TR5 and TR8.....are they connecting both layers?

[okantex]

sis kebab is hot now
thanks ivconic.
thanks from deep in my hearth.
it is working now.
as you say it was because of a few cross connections.
tr1 and tr8 .

I used D20cm T30 0.45 wire for test to deltapulse.since I was at home it was not suitable to test for coin or else.

for big coil what do you offer.
halahoop ?(75cm) or bigger.
frequency is 100-150 hz.
and to increase current of coil what must I do?
I used socket for ırf.( socket from pc fan,3 legs socket.)fine for not to burn ırf while soldering.
and also I used heatsink over socket.looks comic but usefull.

it is good to see something that you make works

[ivconic]

Very good!


Very good!

For 60cm coil u can use 0.55mm wire with 29 windings, it will give some 5.8 to 6.0 ohms....No serial resistor needed....
You may experiment with different wire gauges but try to keep resistance over 4 ohms just to preserve fet for heating and blowing....
I do not use socket for fet, dont trust in those

Congratulation Okan, now you have good PI...
Regards!

[Ahmad_Mohammadi]

75cm

okantex,

75cm coil requires 13turns of 23awg or 0.5mm.
Try this and let us know the result.

I hope this helps.

[diminute]

For 60 cm coil, with 29 turns and 0.55 mm you have 1080 uH, 3,9697 omhs, TC 241,62 ... Imax 2,6847 and Iavg 64,43 mA (IRF 740, 12 Volts).

I believe that´s a good coil for DP.

For "75cm coil requires 13turns of 23awg or 0.5mm."
you have a coil with 275 uH, 2,7037 ohms, TC 85,8388 uS, Imax 3,74 A, Iavg 89,89 mA.

This secund option is not good for DP.

For 75 cm and 0.5 mm wire... I believe that 25 turns is optimal.

Thanks to BBSailor for your instructions.

Regards,

diminute

[Unregistered]

Iave

diminute,
How did you calculate the Iave???

Regards

[diminute]

Sorry, for the first case Iavg is 648 uA... and for the second case ("75cm coil requires 13turns of 23awg or 0.5mm.") Iavg is 321 uA.

For (...75 cm and 0.5 mm wire... I believe that 25 turns is optimal...) TC is 176.8 uS, Imax 2.12 A and Iavg is 375 uA.

But only for coil circuit, the another circuits use very much Iavg.

Thank

diminute

[ivconic]

....


Thanks Diminute!

Ahmad, i think your datas are not suitable for low frequency...such as on Okan's DP....from 100 to 150Hz....
But you might be right for PI's with higher frequency...let's say 800-900Hz
It will need some checking...

I had a lot of problems earlier, making coils for DP, mostly obeying some datas posted here for other PI's...Later i found out; it was my missunderstanding!
Mostly datas are for higher frequency PI's....Pulse Star, Hammerhead etc...
Of course Okan can run his DP on much higher freq. just need to rearrange frequency generator, changing 680K to 120K or even less and few more things....Right now i dont remember...But all explained in DP thread.....
I made all my DP's to work between 90 and 120Hz, so i dont have some experiences with it on higher freq...
Regards!

[Unregistered]

500Hz

ivconic,
What inductance coil is best for a PI worked at 500Hz?
Cheers

[ivconic]

???

Dont know...???

Ask Geo...

I am still runing DP on low freqencies...90-120Hz....

Regards!

[Geo]

Hi all. I work my DP at 350Hz and i use coil with big inductance (about the same with Ivconic's coils).
DP needs a coil with inductance of 800....1000 uH.
I dont know if DP works good at frequency biger than 400Hz.
Regards