Surf PI Pro

[sdesic]

I have made PCB designed by ApBerg and it was not working ... no sound at all
Changed NE555 to TS555 still same.
Only if I touch IRF9640 I get some sound in headphones ..
I get huming sound when I touch volume pot - connected to darlington transistor
or when I touch both IRF and that pot pin I get sound like I shoul'd have if found metal
from youtube test videos...

R2 trim pot is now 3.3k resistor

Voltages
TS555 pin 4 and 8 is 12.10V
IRF9640 S leg has 12.1V
7660 has -4.36V on pin 5
7660 has 5V on pin 7 (and 8 ?)
4093 has 5V on pins 1, 9, 12, 5, 14
4093 has -4,35V on pin 7
4066 has 5V on pin 14
4066 has -4,35V on pin 6, 8, 9 unused part
4066 has -4,35V on pin 7
358 has 5V on pin 8
358 has -4.35V on pin 4

I am using 0,4 mm enamelled copper wire 23 turns - 22 cm diameter 2.8 Ohm at PCB and 2.3 Ohm at coil
Don't have inductometer...
Don't have oscilloscope... yet

[sdesic]

changed bc879 to MPSA13 with orientation right and I got siren with variable volume - volume pot is working
with or without coin it is siren
pots are not responding
offset trimmer also does nothing
I have 55mV at coil

[sdesic]

PCB and parts side

[dfxmadness]

Is this the surf pi duel field that whites sells?

[sdesic]

this thread is marked Surf Pi Pro
it's simplified version of SurfMaster Pi (Pro)

[dfxmadness]

What is the difference between this and the surf pi duel field?

[kt315]

What is the difference between this and the surf pi duel field?

dual field one is selling for more price.

[sdesic]

Can I convert Surf Pi Pro to Surf Pi
using Surf Pi Pro PCB by disconnecting parts ?

[sdesic]

Surf Pi Pro - no siren when I disconnect tc555.

Also if I replace C1 22nF with different one it changes sound frequency,
if no C1 is connected there is no sound.
Then Sens pot has some effect - from silence to weard sound...

Anyone ?

[deathmatch]

sdesic I think that cascade with 555timer and IRF9640 not work correctly. Change search coil on the speaker. If you listen sound -use frequency meter. If frequency from 400 to 800 Gerz - your surf work properly.The generation after 555 maybe interrupted if IRF not open\closed and not full open closed.///
But second version - local electromagnetic field(hitch) ///walk to park\forest and check construction.

[sdesic]

Coil and other thing are not moving in relation to each other.
Without coil there is same sound.

[deathmatch]

Many trifles can give similar effect.
For example gumboil. Though the producer writes that gumboil doesn't demand washing. And upon washing it is necessary: simply after the soldering there is resistance between paths which aren't connected with each other.
As a result on megaohms pro-calls appear figures... And they shouldn't be
And still council: you can simply disconnect a delay from work of the 4066th chip.
For this purpose you should disconnect temporarily R3 from the 555th chip.

[deathmatch]

I to you once again repeat: seal the loudspeaker instead of the search coil. It is admissible during control and will help to solve your problem.
Still try in the following places according to the scheme:
4066 pin 11, pin 2, pin 4. The same will sound there as in the coil. Disconnect R3. If on pins 11,12.4 no signal - then delay cascade work.

[sdesic]

You say to disconnect R3 and to try powering without it ?

[sdesic]

R3 disconnected no sound in headphones.
When volume is max there is sound - faint constant sound like siren.
I think volume pot is heating up.
Pin 2 4066 has 0V
Pin 2 4066 has 0V
Measuring pin 11 on 4066 produces siren in phones.