Mouser: My order from 9 Feb was sent 12th and delivered to Poland 18th (some delay at the Paris airport). Knowing the problems there I am not complaining about time and even that Mouser has forgotten to include 100 transistors in this package (although marked them in order as "shipped"). In such tim...

I am going other ("distributed") way supplying my racks. Currently I have three 84HP racks (full metal) occupied and next on the way. Every 84HP rack has it's own linear DC voltage regulators (up to +12V/1.5A and -12V/1A although due to heat produced I don't intend to excess 1A in continuous work) a...

Double post...

MCP4922? You've got what you pay for. Cheap DAC - poor linearity DAC (usually). I've tested about 10 pcs of MCP4822 from two sources (essentially the same DAC as in MCP4922) and only 1 has good enough linearity (I am not talking about DAC's resolution but about DAC's linearity). That's why calibrati...

I would say that Arduino is for simple sequencer projects only. It is too slow if you want good timing resolution with the highest BPM and at least 8 channels. Time window for processing on interrupt may be too short. I started such project but not finished it yet. But it is the easiest platform to ...

Which manufacturer do you use? I use the Gerber specs and the files for the cam processor provided by Elecrow. Maybe you should change your manufacturer. I use proven manufacturer from my country. And I think he has a good reason to keep such specs. I wouldn't trust a pcb with such low distances be...

Which manufacturer do you use? I use the Gerber specs and the files for the cam processor provided by Elecrow. Maybe you should change your manufacturer. I use proven manufacturer from my country. And I think he has a good reason to keep such specs. I wouldn't trust a pcb with such low distances be...

Nice project. I even wanted to assembly it but my PCB manufacturer said that Gerber files are out of his specs - vias diameters are too small (0.4mm, should be 0.8mm) and tracks distances are too small (7 mils, sometimes 4 mils, should be at least 8 mils). I've even tried to import Gerber files into...

1. NE5532 has lower noise (about 3 times lower than TL072). It may be noticeable with low level signals. 5532 is a bipolar Op Amp but in this circuit it doesn't matter. 2. Gain range will start from 0dB if you connect one end of pot R12 to the ground. 3. If you want to increase gain, change R8 accor...

You have not walked far away. Today's synthesizers are specialized computers with specialized software (sometimes even have keyboards).
And music theory is based on mathematics.

Depending on your pre-amp circuit you may expect change in output volume when load impedance (headphones) is changing. Also low frequency range may be affected (lower headphones impedance - worse low frequencies) but it also depends on the circuit.
And expect clicks if switched when power is on.

devinw1 wrote: ↑

Wed Nov 04, 2020 2:59 pm

One of the weakest parts about the Arduino API is that it really doesn't have a proper debugger!

Arduino API is for those not knowing how to use debugger.
If you know how to use debugger, you don't need it (in Arduino)

Hal Chamberlin - Musical Applications of Microprocessors. Chapter 13: Digital Tone Generation Techniques and next ones. Little old-fashioned but theory is theory, not aging so fast. And relatively simply. Vadim Zavalishin - The Art of VA Filter Design (little harder to read). Source code: look at th...

1. You may use Serial Port Monitor. I recommend to set it to max possible speed (usually 115200 or so). Please notice that the same value must be set on both sides - in the code and in the serial monitor. Use it only for debug. If you want examples, look at my source arduino code of the Digital Poly...

thanks for putting the samples up, i see what you mean. your build is looking great, very clean organization of boards and ccables. Thanks. Such organization was possible due to "mainboard" conception, putting all connectors at the edges of the board, using pcb-type MIDI connectors and enough space...

Jaytee wrote: ↑

Sun Nov 01, 2020 4:14 pm

There’s one resistor change to make when using the Alfa clone but otherwise they’re pin compatible.

Alfa clones need two resistors to be changed: one for -V input and one for pulse output.
I've encountered VCO circuits which works better with CEM3340 than with AS3340.

I have built two Frequency Central Power Supplies, each of which are powered by a wall-wart. They both provide the +/-15 volts as expected, and one has a 5v regulator installed as well. Should their grounds be the same? When I (very briefly) touched my voltmeter probes to their grounds, there was s...

this is awesome. ive always been curious about the dreamblaster, seems like theres a lot in there. how do the effects sound? Effects (chorus, reverb) are rather "delicate" which means that there is noticeable change but not so big I've expected. And it depends on kind of program. Must say that Atta...

Part3: Prototype. Prototype design resembles PC. It has mainboard, modules, displays, controls and input/output jacks. Mainboard and modules were made on stripboards. Case is standard 1U 19" rack. Audio connections were done with shielded cable, mainboard under-connections - with teflon-coated AWG28...

Part 2: Source Code. Disclamer: The code is "as is". It was not coded using professional standards but to have maximum simplicty and understanding. It may contain remains of previous, not used or future functionalities. Current version is still work-in-progress (and probably always will be). Synthes...

Part1: Concept design and schematic. 1. General information DreamBlaster X2 is a GM/GS polyphonic MIDI synthesizer module designed in Waveblaster format. It is based on Dream 5505B chip with 81 voices polyphony and effect engine. As it has built-in USB interface and audio output, it may work as a so...

But yes for hobbyists, AliExpress is the better place, although as others have pointed out as well as me, it is a minefield to havigate to avoid the fakes by having to test everything when it arrives. But AliExpress do refund you within 3 days if you do find you've been sent some. Previous years I'...

I'm using Bourns PEC16 encoders with pushbuttons (bought from Mouser). Maybe little too big but reliable. My OLED display is 1.3" white OLED 128x64 I2C module (bought on Aliexpress).

^ Agree with the latter. But not the former. The cerdip may need an adjustment to its oven temp, but there's no reason to expect lower thermal resistance will upset the oven control in typical synth use cases. It's not a fighter jet avionics environment. <-- where it *would* matter. But where also ...

1. The most important difference between 3045 and 3046 for analog VCO's is the thermal resistance (lesser for CERDIP package). Changing 3046 for 3045 may cause temperature stabilization problems for owen-based VCOs. 2. High voltage versions like 3146 are not full replacement for 3046. Analog VCOs us...