Spin Semiconductor

sin(a + b) = sin(a) + cos(a)*b This works very well, except the output of the calculation exceeds +/- 1.0 so it has to be scaled down once the calculation is made. A value of 0.577 for b is close to 45 degrees phase shift for the sine wave once it is scaled to the range. A 0.258 value of b is 22.5 ...

I posted a white noise generator in a previous post: http://www.spinsemi.com/forum/viewtopic.php?t=528 However, I think that a different version that cycles more slowly would work better for filters, S-H, and other applications that could use the random numbers generated at a slower pace. I've put a...

I don't see any benefit to doing mono this way. Why not just connect one input and then read from ADCL when you need to? I would tie the unused ADCR to ground through a 100n capacitor just so a high impedance input isn't left waving in the breeze like an antenna. Probably not important as long as y...

Actually, I considered that and the first way that I wrote the code used a register as a counter so that it would alternate reading the pots on each pass through the code.... i.e. on the first pass through the code it would read one set of pots, then on the next pass through it would read the other ...

This is an untested idea, and there may be techincal limitations of the FV-1 that would keep it from functioning properly. There are only 3 Pot inputs to the FV-1 but sometimes you need more for a program. The way to add more pots is to multiplex the pot input channels on the FV-1 so that multiple p...

The 14ma current limit is not on the datasheet, it is just what it works out to be with the 100 ohm resistor shown in the same schematic. Most pins are 20ma limit so I suspect that is the absolute max.

regards, Jack

If you run them in series it should be OK since the current will be the same but you may need to adjust the current limit resistor value slightly. You probably will not be able to run them in series. The forward voltage of two LEDs in series will be 3.6v or more, and there is only 3.3v powering the...

I have written a 24-bit pseudorandom noise generator for the FV-1. It is a little different than the one that Frank posted and uses fewer instructions. It should run for over 8.5 minutes without repeating. ; 24 bit maximal period Galois LFSR ; Example by Jack Orman ; http://www.muzique.com ; March 5...

There have been a number of papers by Parker, Bilbao and others presented at the DAFx conferences. Interesting reading but somewhat technical in nature.

Info: Spring Reverbs

regards, Jack

I mounted my Spin SPN1001-DEV on a chassis with an interface board for guitar use:



Check it out in my blog:

http://www.muzique.com/news/fv-1-dev-board/

regards, Jack

Digital Larry wrote:First off, I think that 4 all-pass stages are required for each notch you want in the spectrum.

DL,

In analog phasers, two all-pass stages produce a notch, so a 4-stage phaser has two notches. 6-stage phasers have 3 notches, and so on.

regards, Jack

Tragic. My sincere condolences to his family and friends.

regards, Jack

I want to pull it low through a diode. So the pin will be about 0.65v above ground.

Should work?

Thanks, Jack

Frank,

What is the voltage at which the address pins, S0-S2, will switch?

I'm guessing that they are cmos and it is around 1/2Vcc? I'm really interested in how close to ground I have to pull the address lines for them to flip to zero (assuming a 20k-47k pullup).

Thanks, Jack

So the width of the pulse would have to be set in the code, I think, which would be strange since in a regular pulse wave, the proportion between high and low is the same at any frequency, whereas here, low notes would have very narrow pulse width, approaching 100% duty cycle on the lowest notes. T...