That works good.
Announcement
Collapse
No announcement yet.
Surf PI Pro
Collapse
X
-
Originally posted by zelkos View PostHi 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,
sorry for writing, I am using google translator
Comment
-
I finally found some time to finish my etched boards for Surf XX (from ApBerg).
Drilled and placed components ... but got one problem (or more)
I had all components and voltages in place and no detection.
Moved strong magnet over coil and it produced sound.
Tried to adjust offset trimmer but it is OK... NE5534 pin 6 is 0.02 V
also tried to add some power adjusting trimmer R2 ... nothing better... only strong magnet produced a hit
Managed to change delay pot to 50K and it started working better...
finally I replaced it with 100K pot and it is now OK ... 10-15 cm 1 EURO coin ...
BUT I have very low or no detection of gold ... and silver probably ... nickel also ...
gone over all resistor components in delay part ... tresh also ... all original values from surf xx
my coils are working OK on my working surf XX detector ... 240 and 300 mH
another thing ... volume is a bit low on my speaker and piezo ...
Any ideas ?
Comment
-
Changed IC's one by one ...
Changed 2N3906...
Replaced cables to pots, and replaced delay and tresh pots
Now I have some detection ... standard pots (10k, 10k, 1k and 100k) and parts
I found that I have no detection from silent mode
(tresh turned to max) (only strong magnet is detected)
and on some sound on speaker I get faint signal... not one I am used to from surfXX
390R is getting hot ... it is probably that my new 390 resistor is ... 1W
power consumption is 45mA to 50mA with metal close to coil
changing IRF would help ?
must dust of my scope too
Comment
Comment