Surf PI Pro

[Silver Dollar]

I like SMT and am thinking about packaging. I'd like a SMT PI board that might fit in
a smaller PVC tube, say 1" ID. Then you can put the board and batteries in the handle...

[bernte_one]

hello bob808

where did you come from?
i am highly interest in the boards smt and tht design
that is what i was looking for long time

did you test the concepts already is the layout correct?

regards

[Aykutb]

Please send if you have nano-surf schemes?

[zelkos]

My first MD...

Hi everyone, this is my first contribution in this great forum

... after I read all the posts in this thread, I decided (cosmetic) modify SurfXX pcb, to adjust pcb for parts that I have. All parts, except the IRF9640 and ICM7555 (tnx Maxim - free samples), are recycled, from my junk box, and pcb made by photo process.

Detector works by first switching on. After adjustments and changes resistors R6 - 270 Ohms, I have quite solid MD, and wait for Friday to go to the Croatian coast to hunt ...

More details will announce when I can set up attachments, some fotos, and PCB in pdf if anyone needs ...
I checked and kept some changes, maybe it is interesting to someone ...

This is Google translate, my English is not so good.
Regards,

[gdogg]

hi all, i to have tried making the surf pi pro, with all the help from you guys, thanx, but now that i have finished it, i get a lot of noise, i have tried to use the parts that were listed and updated. I am using a 12 v battery 7 AH. the frequency potentiometers don't seem to be doing anything other than the volume potentiometer, any one experienced this problem?

[zelkos]

... the frequency potentiometers don't seem to be doing anything other than the volume potentiometer, any one experienced this problem?

Surf pi pro has no frequency pot, but there s trimpot for PWM (5kohms, or resistor 3k3). Aniway, I had no such experience.
Attempt to make clear footage of both sides of the PCB, you probably have a mistake or a bad element on the PCB.

It would be about so it looks. This is my PCB before adjustments and changes.

[gdogg]

looks very nice, mine is the first one from the plans that was listed.

[sukri01]

hi zelkos, are you using MPSA13? is that the correct orientation?

Surf pi pro has no frequency pot, but there s trimpot for PWM (5kohms, or resistor 3k3). Aniway, I had no such experience.
Attempt to make clear footage of both sides of the PCB, you probably have a mistake or a bad element on the PCB.
[ATTACH]31470[/ATTACH]
It would be about so it looks. This is my PCB before adjustments and changes.

[zelkos]

hi zelkos, are you using MPSA13? is that the correct orientation?

No, I use BC517, in first place, and change to BC327-40. This trany not need to be darlington... 2N3906 also changed to BC337-40, as well as some resistors and capacitors.
Also, I got better results with the MC14093 and MC14066.

[zelkos]

Mistake!

No, I use BC517, in first place, and change to BC327-40. This trany not need to be darlington... 2N3906 also changed to BC337-40.

Ahhh... my mistake

BC517 -> Bc337-40 & 2N3906 ->BC327-40, sorry...
R6 - 270 ohm/2W
C9 - 560 pF
C2 - 2 x 2200 uF

On the site IC1 properly worked any "CMOS 555" and on the site IC2 without changing the surrounding elements only NE5534. The best was the old Signetics, much better than the new TI. "Direct replacement", as OP27, LM318, and other less common opamps, did not work correctly, again without changing the surrounding elements. Probably the biggest disappointment was the "super high" OPA134.
Any 358 worked solidly, including some 17358, 6358, and similar, and also different 7660, and even 7661 and 7662.
As I said earlier, MC14093 and MC14066, gave the best results, they are genuine, old Moto...

My junk box is quite large...

[zelkos]

Well, this is the definitive version, for now ...

PCB is a new, slightly larger in order to fit the frame. The new is BYV28-200 between FET and coil and resistor 10ohms instead of 12ohms.
Pictures say more than a thousand words!

[bernte_one]

hello zelkos

Looks good
can you post the layout files and the silkscreen layout?

[zelkos]

Hi bernte! Tnx guru!

I have a pcb lay in .pdf, flipped, ready to print for photo process. Between the centers of large dots is 160 x 100mm, approximately. I do not have the silkscreen layout, differences are only cosmetic, compared to SurfXX lay and are easily seen in pictures.
The power is external, 3 x Li-ion 19650 / 4900mAh.
The coil is a spiral, as the link shows -> http://www.adrianandgenese.com/blogg...rom-a-diy-kit/
... inductance is 250uH, resistance 1,2ohms. Works quite well, minus is considerable weight.
Volume potentiometer is shorted, the speaker is a piezo, resistor within emitter Q6 (BC337-40) is 22ohms.

Pay attention! On pcb on the side of the connection are three SMD resistors 0ohms! Another difference is the change in the allocation of connections potentiometers, which are very easy to see in the scheme... resistors are 1/8W, except R6, R7 and 10ohms (not on scheme).

[bernte_one]

thanks for posting this
why did you put two big caps on the board?

[zelkos]

Hi Bernt,
The two large capacitors are in place C2. At this point the different schemes show value capacitors between 1000uF to 3900uF. That capacitor is a reservoir of energy for Surf, especially for TX output stage, so it is physically close to the IRF9640. If the capacitor is bigger, Tx has a stable frequency, audio output run more smoothly, and logic gates operate with less spikes, so better and more peaceful Surf works.
This is especially the case if the batteries are connected with a cable, such as in my Surf.
At the point C2 - bigger is better!