Search found 39 matches

by smear
Mon Feb 19, 2024 9:57 pm
Forum: FV-1 hardware questions
Topic: Microcontroller and FV1 in parallel
Replies: 6
Views: 32418

Re: Microcontroller and FV1 in parallel

You will first need to make sure your microcontroller is a 3.3v device, if you use a 5v device like an Arduino Nano it is a 5v micro and will need to have 5v-3.3v level shifters. Easier to use a 3.3v Micro so no need for level shifters. Thanks for the reply! I'll use a microcontroller chip directly...
by smear
Mon Feb 19, 2024 9:55 pm
Forum: FV-1 software questions
Topic: Roast my delay
Replies: 3
Views: 11593

Re: Roast my delay

;delay rdax adcr,1.0 wra del1,1.0 RMPA 1 MULX pot2 ; decay remainging volume further based on POT2 wra del1,1.0 ; write delayed sound to start of delay ram again (repeats) RMPA 1 MULX pot1 ; set 'volume' of delay signal in ACC based on POT 1 You leave the input signal in the accumulator after writi...
by smear
Fri Sep 08, 2023 9:23 am
Forum: FV-1 hardware questions
Topic: Microcontroller and FV1 in parallel
Replies: 6
Views: 32418

Re: Microcontroller and FV1 in parallel

Use a lower POT value like 5K and it should be fine. The only real issue I can think of is using a POT value at the top of the range like 10K as that may supply enough current for one of the converters but not both so they would current starve. Oh good point, didn't think of that! Thanks very much ...
by smear
Wed Sep 06, 2023 11:08 pm
Forum: FV-1 hardware questions
Topic: Microcontroller and FV1 in parallel
Replies: 6
Views: 32418

Re: Microcontroller and FV1 in parallel

You will first need to make sure your microcontroller is a 3.3v device, if you use a 5v device like an Arduino Nano it is a 5v micro and will need to have 5v-3.3v level shifters. Easier to use a 3.3v Micro so no need for level shifters. Thanks for the reply! I'll use a microcontroller chip directly...
by smear
Mon Sep 04, 2023 10:21 pm
Forum: FV-1 hardware questions
Topic: Microcontroller and FV1 in parallel
Replies: 6
Views: 32418

Microcontroller and FV1 in parallel

I'd like to use a microcontroller and an FV1 together. I know that normally, you should just connect all the controls to the microcontroller, and then output those values from the microcontroller to the FV1. But some microcontrollers have a small number of pins. Sometimes, it'd be easier to connect ...
by smear
Sat May 22, 2021 11:36 am
Forum: FV-1 hardware questions
Topic: Some things I've learned about the FV-1
Replies: 19
Views: 29104

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

speaking of making separate DVdd and AVdd supplies, has anyone tried adding an inductor (or even just a ferrite bead) in series between the +3.3V supply and the AVdd and REFP pins? or any ideas on values that might be suitable to give cleaner power to AVdd and REFP? i've seen this done with other co...
by smear
Sat Dec 05, 2020 8:15 pm
Forum: FV-1 hardware questions
Topic: Some things I've learned about the FV-1
Replies: 19
Views: 29104

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

So, here is my feedback on FV1 and noise: - I have used juste one 3.3v supply on my PCB (REG113NA) - No noise at all when using a 5V power supply adapter to supply my op amps (OPA1642) - Noisy when using a 9V power supply adapter to supply my op amps (OPA1642) I have other issues but not related to...
by smear
Sat Nov 07, 2020 3:12 pm
Forum: FV-1 hardware questions
Topic: FV-1 memory read I2C protocol operation mode
Replies: 3
Views: 5759

Re: FV-1 memory read I2C protocol operation mode

how are you planning to store the programs?
by smear
Wed Sep 09, 2020 10:31 pm
Forum: FV-1 hardware questions
Topic: Pot Values
Replies: 3
Views: 6336

Re: Pot Values

the pots are just working as variable voltage dividers between +3.3V and ground. in a voltage divider, using larger resistors limits the current available, but also increases the amount of noise picked up by the divider. but the pots aren't part of the signal path, plus there's internal filtering on...
by smear
Wed Sep 09, 2020 6:21 pm
Forum: FV-1 hardware questions
Topic: fv1 input lowpass filter
Replies: 1
Views: 5622

Re: fv1 input lowpass filter

i'm dumb and didn't see this bit in the manual "The purpose of this input bypassing is to remove any high frequency noise from the input signals, and to provide a low impedance at very high frequencies." so i'll take that as assurance enough and just use whichever similar cap values i have...
by smear
Wed Sep 09, 2020 6:09 pm
Forum: FV-1 hardware questions
Topic: NOISE AND MORE NOISE
Replies: 6
Views: 8090

Re: NOISE AND MORE NOISE

i don't know of any products on the market that do that, but like you said "Well-known brands have a lot of noise in their products" since their pedals sell, those brands don't need the less noisy version. but if you want less noise than them, you'll probably need to use more robust design...
by smear
Tue Sep 08, 2020 8:00 pm
Forum: Algorithm development
Topic: Lofi Vinyl effect
Replies: 6
Views: 9511

Re: Lofi Vinyl effect

if it's a mono effect, maybe you could just amplify and highpass the sound from the unused input? might sound crackly enough
by smear
Tue Sep 08, 2020 2:33 pm
Forum: FV-1 hardware questions
Topic: NOISE AND MORE NOISE
Replies: 6
Views: 8090

Re: NOISE AND MORE NOISE

have you tried a 4-layer board with separate analog and digital supplies and differential inputs/outputs, as described in this post? http://www.spinsemi.com/forum/viewtopic.php?f=2&t=868
by smear
Tue Sep 01, 2020 3:20 pm
Forum: FV-1 hardware questions
Topic: fv1 input lowpass filter
Replies: 1
Views: 5622

fv1 input lowpass filter

i understand we need the output 1k+2.2nf lowpass filter due to the sigma-delta converters. but how important are the input 1k+1nf lowpass filters? i did see this thread, where frank mentions “rolling off the out-of-band high end a little prior to the ADC can only help”, which makes me think it's not...
by smear
Sat Aug 29, 2020 8:26 pm
Forum: FV-1 hardware questions
Topic: Some things I've learned about the FV-1
Replies: 19
Views: 29104

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

i gave the AP2205-33Y LDO a shot, and i can't hear any difference, but to be fair i'm not using proper test equipment. i'll try the LM431 as a shunt regulator next. but i do wonder if having separate analog and digital supplies was a lot more significant than the specific part used?