kvitekp

MidiALF!
8.9 x 4.34”

Comment by kvitekp May 17 permalink
MidiALF!
@qp: what’s the model/make of that great looking LCD?

Comment by kvitekp May 16 permalink
MidiALF!
Putting MIDI LEDs before MIDI connectors makes it more difficult to solder MIDI connectors flush to the PCB surface because you have to level off the LED solder knolls really well. Soldering MIDI LEDs from top seems to be somewhat easier. BTW, do…

Comment by kvitekp May 16 permalink
FS: Anushri, Shruthi-1 IR3109, Shruthi-1 SMR4 Mk I
Anushri (naked) — SOLD

Comment by kvitekp May 16 permalink
MidiALF!
qp: the plan was to make a hole large enough to fit the knob skirt, just like on Shruthi.

Comment by kvitekp May 15 permalink
MidiALF!
@piscione: nope, I just added it ;)

Comment by kvitekp May 13 permalink
MidiALF!
@piscione: send me an email at pete at kvitek c o m specifying how many PCBs and pre programmed MCUs you need, and country where to ship them, and i’ll send you a paypal invoice.

Comment by kvitekp May 13 permalink
MidiALF!
@strangenoize: POWERTIP PC-4002A8 LCD has 14 pins wheres MidiALF board expects 16 pin. You probably still can use it, but you may have to hack the back light LED connection.

Comment by kvitekp May 13 permalink
MidiALF!
I’m buying 40x2 white-on-blue LCDs from ebay user egochina8848 here — they look great, seem reliable, and use a lot less current than Newhaven black on yellow 40x2. Delivery time is also very reasonable.

Comment by kvitekp May 13 permalink
New Book: Make Analog synthesizers
The coupon code still works, thank you @cereyanlimusiki !

Comment by kvitekp May 12 permalink
Eurorack module testing tool (DIY)
count me in for PCB only variant

Comment by kvitekp May 10 permalink
CEM Options
@mantora: I sold by beloved Shruthi-1 IR3109 a couple of weeks ago trying to spring clean my lab/studio… and already regret it. I don’t care over hyped or not, used in a bunch of famous synths or not… if it gives me inspiration, I want it. And it d…

Comment by kvitekp May 9 permalink
Ladder Filter for Shruthi
@tubeohm: Pot3 is at the maximum, noise floor is ~20mV PP. VCF scaling and resonance feedback are tuned according to the spec. Adding 4.7M parallel to R34 bringing it down to 282K does not reduce signal bleeding. This is certainly the filter blee…

Comment by kvitekp May 9 permalink
Ladder Filter for Shruthi
TubeOhm Ladder Filter vs. Moog SlimPhatty TubeOhm’s ladder filter seems to have a little less low end and quite a lot of aliasing at high frequencies, so it sounds harsh and gritty comparing to SlimPhatty filter. It also looks like TubeOhm’s filt…

Comment by kvitekp May 8 permalink
Reverbbbb
My MPX-500 has firmware 1.04 … anyone has a newer version?

Comment by kvitekp May 5 permalink
Sequencer, which?
Yes, 24LC128 will work too, you’ll still be able to save 64 sequences in it.

Comment by kvitekp April 30 permalink
Sequencer, which?
@sammy123: DigiKey and Mouser BOM can be found here

Comment by kvitekp April 29 permalink
Sequencer, which?
@piscione: i’ll announce the price in a few days, stay tuned. Song mode is on the road map after CV extension is done.

Comment by kvitekp April 29 permalink
Sequencer, which?
First batch of MidiALF main PCBs is here! I’m going to build one for testing purposes and start shipping PCBs and pre-programmed MCUs to those who want to start building the main board first and proceed to the CV later.

Comment by kvitekp April 29 permalink
Ladder Filter for Shruthi
Got my board today… looks good. Is there a single place where pcb silkscreen and build instructions errata is consolidated?

Comment by kvitekp April 23 permalink
My dream DIY sequencer (just a dream)
I love my RM1x despite it being v1.12 firmware with annoying “spit pgm reset on stop” bug. Yamaha sells v1.13 upgrade with the fix for $140, but this is almost the price I paid for RM1x itself! Anyone out there with v1.13 and EPROM reader? It’s jus…

Comment by kvitekp April 22 permalink
FS: Anushri, Shruthi-1 IR3109, Shruthi-1 SMR4 Mk I
Shruthi-1 IR3109 (dark blue case) — SOLD

Comment by kvitekp April 21 permalink
Sequencer, which?
@joshuagoran: fab informed me that first batch of MidiALF main board pcbs will be shipped on Apr 29th. I’m not sure how long it would take them to get here but expect it to be between one and two weeks. I’ll build one board to make sure everything …

Comment by kvitekp April 18 permalink
My dream DIY sequencer (just a dream)
LED encoders are not as useful on a sequencer as it may seem because 16 or so LEDs around the encoder don’t have enough resolution to represent the note value or velocity. MidiALF firmware development started with an ATMega644 on a bread board with…

Comment by kvitekp April 16 permalink
Eurorack module testing tool (DIY)
Yeah, however if I only use 1/4” investing in a bunch of 3.5mm conversion cables just for testing purposes may be an overkill… besides, it could lead to a Euro rack project start which is not currently my plan ;)

Comment by kvitekp April 11 permalink
Eurorack module testing tool (DIY)
@pichenettes: yeah, power connector format… if there is a place on the pcb to add an extension connector with +/-15V and all I/O so one can build a break out box with MOTM and Synthesizer.com style power connectors and a bunch of 1/4” 112AXes.

Comment by kvitekp April 11 permalink
Eurorack module testing tool (DIY)
Could this be modded to other modular synth formats, i.e. +/- 15V and MOTM?

Comment by kvitekp April 10 permalink
Ladder Filter for Shruthi
@altitude: here, they are a bunch of nice guys running a unique dump of all sorts of electronic parts in the heart of Silicon Valley where local companies dispose their unused stock of parts for last 30 years.

Comment by kvitekp March 27 permalink
Ladder Filter for Shruthi
I have local outlet here that carries NOS RCA CA3046 ($.79), we can arrange a group buy if anyone is interested.

Comment by kvitekp March 26 permalink
What to check when buying a used oscilloscope
Check here and here, EEVBlog Dave’s run down and calibration on used Tek 2225

Comment by kvitekp March 8 permalink

More Comments

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

About

Username: kvitekp
Joined: April 2011
Visits: 1,322
Last Active: 10:08AM
Roles: Member