Search found 38 matches

by amz-fx
Fri May 28, 2021 7:22 am
Forum: FV-1 software questions
Topic: Using asfv1 compiler
Replies: 2
Views: 5209

Re: Using asfv1 compiler

This is a basic command line use: asfv1 -h -p0 infile.spn outfile.bin The p0 switch tells it to compile for patch location zero, i.e. the first one. Your Spin asm source is the infile. Your compiled binary is outfile.bin You must have Python installed on your computer for asfv1 to work properly. Bes...
by amz-fx
Tue Dec 29, 2020 9:12 pm
Forum: FV-1 hardware questions
Topic: Some things I've learned about the FV-1
Replies: 19
Views: 29141

Re: Some things I've learned about the FV-1

Here is an interesting (but amusing) look at one player's problem with noise in a guitar amp: https://youtu.be/t6E0O8UtObU With few exceptions, a buzz will be related to poor grounding, bad cables or defective jacks. Identify types of noise: http://www.muzique.com/news/hum-whine-and-noise/ Best rega...
by amz-fx
Fri Jul 31, 2020 4:26 am
Forum: FV-1 hardware questions
Topic: NAMM 2017
Replies: 41
Views: 64703

Re: NAMM 2017

It might be good for the FXcore to have its own section in the Forum.

Anyone else interested?
by amz-fx
Wed Jul 22, 2020 3:07 am
Forum: FV-1 hardware questions
Topic: NAMM 2017
Replies: 41
Views: 64703

Re: NAMM 2017

by amz-fx
Tue Aug 20, 2019 4:04 am
Forum: FV-1 hardware questions
Topic: FV-1 out of stock
Replies: 18
Views: 19799

Re: FV-1 out of stock

Thanks, Frank!
by amz-fx
Sun Aug 18, 2019 6:26 am
Forum: FV-1 hardware questions
Topic: FV-1 out of stock
Replies: 18
Views: 19799

FV-1 out of stock

The FV-1 is out of stock at all my usual sources.

Is the FV-1 still in production?

If so, when will Small Bear and the other parts suppliers get new stock?

Thanks!

best regards,
by amz-fx
Sun Oct 29, 2017 6:25 am
Forum: FV-1 hardware questions
Topic: Board bringup issues
Replies: 14
Views: 11882

Level Shifter:

Image

You may need to lower the value of the pullup resistors if this does not work consistently.

regards, Jack
by amz-fx
Sat Jan 14, 2017 11:29 pm
Forum: Algorithm development
Topic: Log taper for audio
Replies: 5
Views: 7501

DL, In most real hardware log-taper potentiometers, there is no log to the taper! In fact, if you put a VOM on the lugs of the pot, it can be seen that the resistance is composed of two linear tracks. The first goes from 0 to mid-point (or so) and the second track from mid to the other end. Or almos...
by amz-fx
Sat Jan 14, 2017 3:40 am
Forum: Algorithm development
Topic: Log taper for audio
Replies: 5
Views: 7501

DL, A simple/easy way to bend the pot response is to square it before use. 0*0= 0 0.2*0.2= 0.04 0.5*0.5= 0.25 0.7*0.7= 0.49 0.9*0.9= 0.81 1.0*1.0= 1.0 As you see, 25% of the value change takes place in the first half of the pot rotation, and 75% value change takes place in the second half. You can e...
by amz-fx
Fri Dec 16, 2016 8:17 am
Forum: FV-1 hardware questions
Topic: reverb distortion
Replies: 20
Views: 19079

The schematic must be wrong as there is no way it could work with the input tied to ground.

Make sure pin 4 of the opamp is going to ground, and the 1M tied to 1/2 Va is connected to the + input.

regards, Jack
by amz-fx
Tue Aug 23, 2016 8:45 am
Forum: FV-1 hardware questions
Topic: more than 8 programs?
Replies: 13
Views: 28108

True. Even though the chip is locked down, you can snoop on the buss and capture the bytes being sent across it. That's a lot more trouble than just clipping onto the pins of the 24LC32 and reading it directly, and takes more technical know-how than many hobby builders possess, but a determined pers...
by amz-fx
Sat Aug 20, 2016 10:10 am
Forum: FV-1 hardware questions
Topic: more than 8 programs?
Replies: 13
Views: 28108

would this offer a greater degree of code security? How hard is it to read data that has been flashed onto an ATMega328? Quite hard but not impossible. There is a lock bit that you can set that allows the flash code to run but does not allow it to be read from the chip. It is reasonably good securi...
by amz-fx
Tue Jul 12, 2016 7:28 am
Forum: FV-1 hardware questions
Topic: more than 8 programs?
Replies: 13
Views: 28108

Just saw this article on how to intercept i2c messages and rewrite the address bits to allow larger eeproms:

http://morethanuser.blogspot.de/2016/07 ... nject.html

regards, Jack
by amz-fx
Wed Jun 29, 2016 8:37 am
Forum: FV-1 hardware questions
Topic: more than 8 programs?
Replies: 13
Views: 28108

There are 512 bytes per program so the micro needs 4k bytes of eeprom just to hold 8 programs. The Atmega328 has 32k of flash memory and if you take off about 8k for the program and bootloader, then it could hold 6 banks of 8 programs each = 48 patches. Not too bad.
by amz-fx
Thu Aug 13, 2015 8:08 am
Forum: FV-1 software questions
Topic: LFO code - how does it work
Replies: 9
Views: 11334

I read that in your previous post and started with a low value but it did not do the job.

I put the numbers in a spreadsheet and calculated the values then plotted the results. I'll take a look at your examples and see how they fit - maybe I missed a calculation or something.

Thanks, Jack