help with surf pi kit no sound

[alcartraz]

just built the kit powered uo set offset to 0volts no sound but by accident if i touch the regulator i can hear a faint tone any help would be good thanks

[silverdog]

have you installed the 2 links above R6/R16 ?

[alcartraz]

yes

[alcartraz]

yes and one just up from c6

[alcartraz]

iam geting a very quiet tone when i put the coil near buzzer or head phones and the speaker wires

[SVEN1]

Not sure if your problem is related to resistor R34?

[alcartraz]

tryed the resistor no joy no sound unless i get coil near hed phone leads ?

[Qiaozhi]

You cannot just guess what's wrong and hope to find the fault that way. You must logically debug the problem, starting with the power supply, then the transmitter, and moving along the receiver stages before finally checking the audio circuit. If you don't own an oscilloscope, then I strongly suggest that you borrow one from a friend. Otherwise you will find this a very frustrating experience.

[alcartraz]

thats not helping much i do not have access to a scope why do things never go straight forward ive double checked all components all in the right place all soldered it seams like iam getting transmit but not recive the delay dont do anything volume only works right at the end and tune dont do anything so its a major fail !!! any ideas ????

[alcartraz]

has anyone got voltages from various points around the board so i could compare ???????

[Qiaozhi]

thats not helping much i do not have access to a scope why do things never go straight forward ive double checked all components all in the right place all soldered it seams like iam getting transmit but not recive the delay dont do anything volume only works right at the end and tune dont do anything so its a major fail !!! any ideas ????

Unfortunately that's the reality.
Without a scope you are going to find this extremely difficult to debug, and clearly you are already finding this a frustrating experience.

Start from the beginning:
Do the power supply voltages measure OK?

[alcartraz]

i got 11.48 volts from 8 aa batts going in i get 11.41 volts at the speaker the regulator first leg 11.48 middle leg 1.41 third leg 11.43 (r12 r13 r14 ) all have 0 volts ?

[Qiaozhi]

i got 11.48 volts from 8 aa batts going in i get 11.41 volts at the speaker the regulator first leg 11.48 middle leg 1.41 third leg 11.43 (r12 r13 r14 ) all have 0 volts ?

Firstly, your batteries are partly discharged, but they should be OK for testing.
Secondly, the regulator (U5) should have 11.48V at the input (pin 3), 0V on pin 2, and 5V at the output (pin 1). This is referring to the circuit diagram on Silverdog's website. Forget about R12, R13 and R14 for the moment. They're noting to do with the power supply. It looks to me like the regulator is either faulty, or you have it inserted incorrectly.

[alcartraz]

its in the same as all the pictures ive seen ? so maybe faulty

[alcartraz]

just had another look am i testing it right - test from multimeter to ground + to legs of u5 pin 3 11.7 bat volts same pin2 1.48 pin 1 10.48 and yes i need to put new bats in thank you for helping