Spin Semiconductor

That's how I do it, programming with the pedal powered, that way you don't need the power connection from the PICkit2, meaning only 3 connections. I've done a couple of pedals with stereo 1/8" jacks in them for programming using a lead that takes SDA, SCL and ground from the PICkit, this allow...

You will want to be careful when using a pickit2 for in-circuit programming. It is 5V Vdd default I believe and the FV-1 is 3.3V only so make sure to set the programmer to 3.3V. Yes I should've mentioned that, or alternatively if the pedal is powered then the Pickit2 will detect that and just use t...

How are you making the programming of the SMD eeprom? I am using a pickit2 which connects to a header I have on the PCB, if you look at the picture above you can see a set of 4 solder pads just above the Eeprom. The pads are Vdd, Vss, data, and clock, by using the 4 pins there is no need to power u...

Problem solved now, the problem lay in a bias resistor in the output buffer which had gone short so after a short time began to throw the bias out on the opamp. Sometimes you can't see the obvious until you walk away and have a think about it. Thanks for the help, now onto finishing this off and get...

It is a new PCB design but that particular FV-1 chip has been soldered into about 8 different pcb's (it's my test chip)and could possibly have developed some damage from being re-used so many times. I have 3 new chips so I may removed that one and check the traces under it for shorts and replace it ...

Thanks frank for the suggestions, I don't have access to a scope at the moment but i'm very sure the signal into the FV-1 is clean leaving me thinking the 3.3v line must not be stable causing a problem with the converters. I will test with a battery instead of a PSU in case that may be at fault. All...

Hi, I have been building an FV-1 based pedal but have been having a little problem with distortion. What is happening is that after powering up the circuit it sounds perfect for a few minutes then develops a distortion sound which I can only get rid of by powering down the circuit and then re-applyi...

Thanks Frank, that's exactly the info I was needing.

I am wondering how the external programs are loaded into the FV-1. When the external Eeprom is selected is the full hex from the Eeprom loaded into the FV-1 chip and then each effect is addressed with the binary applied to S0-S2, or as the values on S0-S2 change does that load a single effect from t...

Hi Alex. The SKRM boards already have that but if something changed at the assembly house then the value of the capacitor may need to change. We are working on this outside the forum since the SKRM boards are an OCT product and I shouldn't use the Spin forum for it. This is not just a problem on th...

Thanks Slacker, I had read that the pickit2 can program Eeproms but I bought the pickit3 thinking the newer version would have more capabilities. Wrong the pickit 3 is a more expensive version which cant do some of the things the 2 can do. I asked at the microchip website and was told that the 24lc3...

Hi, I have built a few FV-1 projects but on my latest build I need to be able to program the external Eeprom using I2C without removing it from the PCB. I have built a header onto the pcb with all the connections needed to do this and I purchased a Pickit3 which I assumed would do the job of program...