Whites Surf PI schematic

[nando.22]

turn the pot displacement of NE5534 not change anything which coil and ideal for design

[joop]

Try turning the offset pot of the NE5534.

[nando.22]

surf pi works but little sensitivity to coins

[sido]

can i put 9volt battery in SURFXX board

Really requires 12 Volts for best performance.

Sid

[paku]

can i put 9volt battery in SURFXX board

[nando.22]

how to adapt in an amplifier output surf pi

[nando.22]

correct voltage terminals ICL7660

[nando.22]

my surf pi was working now so keep the sound in the earpiece and not ten potentiometers variation which can be

[Qiaozhi]

which function in the circuit ICL7660

The ICL7660 is a voltage converter. In the Surf PI circuit it is used to generate the -5V supply for the opamps.

[nando.22]

which function in the circuit ICL7660

[nando.22]

al the photos of this coil and pcb a very low coil

[nando.22]

[nando.22]

Rode another pcb more the problem is still not present in the audio speaker and this warming NE555

[nando.22]

scheme of link potentiometers

[porkluvr]

it interferes with the sound of the detector

That's a very sensible statement.

Did you use NE5532 instead of NE5534?