Spin Semiconductor

Surprisingly the circuit stopped acting crazy by itself! So I didn't even include the 1uf cap. I noticed that at the startup the overload LED turns on for about a second and then the circuit works nice without any issue, is that normal or it's because of the diodes? Can those diodes harm the FV-1 in...

Ohhh, now I get your point. I'm gonna include the cap and see what happens...
Thanks again

Thanks for the reply.
Those diodes are there to protect the ADC input from high level signals, I suspect that those areresponsible for the misbehaves because this afternoon I played for about half hour without any problem!
I will disconnect those clamper if the problem happens again.

Hi, it's me again with another FV-1 issue! I've built another FV-1 based guitar stompbox, and loaded GA demo programs into the EEPROM. For most of the time when I power on the unit, the overload LED lights up constantly and there is no sound. Other times it works fine for a little time(a mininite or...

It's deffinitely the chip! I bought two of them from a chinese supplyerband both had this problem. The noise becomes worse and worse when you turn up the reverb mix, am I right?

Ohhh you're right; those transistors are inverting the pulses.Thanks Ian, I'll give it another try.
Also could it be the layout causing this problem? I mean I'm using perfboard, and the ic orog acts like there isn't any programmer connected...
Thanks
Sajad

Hi Ian, I was hoping to see you here, I built that circuit but unfortunately it didn't work for me either with ic-prog or with pony prog; The only circuit that I could get to work was the one I posted above. I will try your circuit once again and see if it workes.
Thanks

Thank you Frank for the answer, So I'll probably give up the onboard programming and settle on removing the eeprom from its sucket, because I fried a FV-1 during soldering and don't want to lose another one!
Thanks again
Sajad

Hi, I've recently built a guitar pedal based on FV-1 and I'm using this serial programmer to program the EEPROM: http://www.hqew.net/files/Images/Article/Circuit_Diagram/i2cserial.gif I want to use pedal's supply(3.3V) insted off 5V regulator and use this circuit as on-board programmer; So I don't h...