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**nando.22** · 02-11-2013, 08:13 PM

I'm having problems with the surf pi not the same sound in speakers

**nando.22** · 02-12-2013, 06:18 PM

and which function in the circuit NE555

**bernte_one** · 02-12-2013, 06:44 PM

i guess ne555 is for pulse timing

**nando.22** · 02-12-2013, 06:58 PM

it interferes with the sound of the detector

**porkluvr** · 02-12-2013, 10:48 PM

Originally posted by nando.22 View Post

it interferes with the sound of the detector

That's a very sensible statement.

Did you use NE5532 instead of NE5534?

**nando.22** · 02-14-2013, 09:03 PM

scheme of link potentiometers

**nando.22** · 02-15-2013, 07:14 AM

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

**nando.22** · 02-16-2013, 06:57 PM

**nando.22** · 02-16-2013, 06:59 PM

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

**nando.22** · 02-18-2013, 07:32 PM

which function in the circuit ICL7660

**Qiaozhi** · 02-18-2013, 07:59 PM

Originally posted by nando.22 View Post

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** · 02-18-2013, 08:32 PM

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

**nando.22** · 02-19-2013, 07:47 PM

correct voltage terminals ICL7660

**nando.22** · 03-03-2013, 10:33 AM

how to adapt in an amplifier output surf pi

**paku** · 03-04-2013, 02:13 AM

can i put 9volt battery in SURFXX board

Whites Surf PI schematic