Spin Semiconductor

Honestly the best thing is to remove all components and clean everything or start with a new board and abandon these ones. You will not be able to clean under the chip and other components unless you have access to a commercial level defluxer which uses hot deionized water under pressure. Went over...

Flux is OK AS LONG AS IT IS NOT WATER SOLUBLE! Water soluble flux is conductive so just a tiny bit under the chip can cause problems, it also tends to be corrosive and can damage the PCB. Damn.. Turns out my Flux is water soluble, so this could be the issue. How would I go about removing residue be...

I have a setup where my FV-1 chip reside on a daughter-board together with the clk crystal, crystal cap and the decoupling capacitors. This board connects with header pins to a "main"-board which houses the power regulator (LM1117), more decoupling capacitors and all other necessary circui...

Simple and interesting distortion block: rdax adcl, -1 ; Read & invert input skp GEZ, 1 ; If neg sof 0.01, 0 ; Soft cut negative wave segment sof -2, 0 ; Make up gain loss, fix phase ; rdax adcl, -1 ; Crossmixer mulx pot0 rdax adcl, 1 ; wrax dacl, 0 ; output, clear acc Only one phase of the soun...

Had another look at the code and realized that the increment for PRN wasn't stored back in the PRN register. For a reason I don't know the code wont work when the increment is too small. The code below: pot0 sets the volume of the noise output and (pot1 + 0.00001) sets the rate at which new noise sa...

I'm aware of the other LFSR noise generator threads, but I'm interested in the counter functionality in the above code that slows down the random value generation rate. The original noise gen from the other thread works fine for me, but as Jack states this code is unverified (and I get a static valu...

The posted code gives me a static output. Was the bug ever fixed? Can't see what's wrong here.

Oh yeah that makes sense.

I decided to add a compensation delay half the length (2048) of the pitch buffer. It's not perfect, but it helps reduce / even out the latency. Sounds better for my application.

Thank you for the input!

I'm toying around with the +/- 1 octave program (AN0001-4.spn) from the AN0001 appnote: http://www.spinsemi.com/Products/appnotes/spn1001/AN-0001.pdf I've noticed that the delay/latency of the pitch shifted signal somehow depends on the amount of pitch shift. How would I calculate the amount of late...

Sorry for re-opening an old topic, but here we go! Setting the LFO to 0Hz on initialization like this: ; 0Hz LFO test ; skp run, START wlds SIN0, 0, 32767 ; Write & Load sin0 at 0Hz sof 0, 0.0 wrax sin0_rate, 0 START: ; cho rdal, SIN0 ; Should read as 1.65 volt?? wrax dacr, 0 ; Write result to o...

Maybe I could use the servo technique to perform the modulation instead of "cho rda"-statements? http://www.spinsemi.com/knowledge_base/coding_examples.html#Servo_technique skp run,1 ;only establish the LFO on the first sample pass wldr rmp0,0,4096 ;set rmp0 to its widest range cho rdal,rm...

Thank you for looking it over! Yes I think the errors are due to the copy/paste. Compiled without trouble on my pc (clean, unaltered output) you are also clearing the acc after writing the sin0 range so I have changed that to keep the value in the acc for the next line to write to the sin0 rate. The...

From another thread ( http://www.spinsemi.com/forum/viewtopic.php?t=469&sid=7a1901be706a4942ea82947d36b046d4 ) RDA 14444,1.0 WRAX 57,0.0 RDA 28594,1.0 WRAX 58,0.0 Could I perform modulation through direct delay ram addreess readouts like this? http://www.spinsemi.com/Products/datasheets/spn1001-...

Hi So I'm trying to use the incoming audio signal to modulate a vibrato effect (instead of using an LFO). My idea was to set sin0 to 0Hz, write the audio to sin0_range and use the cosine (max at zero?) as the modulation source for the vibrato (delay). My code does not create any vibrato, but here it...

To find the frequency and delay length from Kf / Ka decimals:

From Kf decimal (K) to Frequency (f):

f = K * (512 * R) / ( 2^18 * pi)

R = sample rate (32768)

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From Ka decimal (K) to delay length (a) :

a = K * (16385 * 32768 / 32767)