Search found 255 matches
- Thu Feb 25, 2021 3:26 pm
- Forum: Music Tech DIY
- Topic: Heads up: Mouser is fairly f'd right now
- Replies: 28
- Views: 1070
Re: Heads up: Mouser is fairly f'd right now
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...
- Wed Feb 10, 2021 1:01 am
- Forum: Music Tech DIY
- Topic: Huge Eurorack Case Power Options
- Replies: 56
- Views: 798
Re: Huge Eurorack Case Power Options
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...
- Tue Feb 02, 2021 1:49 am
- Forum: Music Tech DIY
- Topic: Question about DACs accuracy
- Replies: 18
- Views: 522
Re: Question about DACs accuracy
Double post...
- Tue Feb 02, 2021 1:45 am
- Forum: Music Tech DIY
- Topic: Question about DACs accuracy
- Replies: 18
- Views: 522
Re: Question about DACs accuracy
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...
- Mon Feb 01, 2021 5:41 pm
- Forum: Music Tech DIY
- Topic: What programming platform to build a sequencer?
- Replies: 28
- Views: 977
Re: What programming platform to build a sequencer?
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 ...
- Sun Jan 31, 2021 5:04 am
- Forum: Music Tech DIY
- Topic: 6..36dB VCF Lowpass/Highpass
- Replies: 6
- Views: 309
Re: 6..36dB VCF Lowpass/Highpass
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...
- Sun Jan 31, 2021 4:10 am
- Forum: Music Tech DIY
- Topic: 6..36dB VCF Lowpass/Highpass
- Replies: 6
- Views: 309
Re: 6..36dB VCF Lowpass/Highpass
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...
- Sat Jan 30, 2021 5:43 pm
- Forum: Music Tech DIY
- Topic: 6..36dB VCF Lowpass/Highpass
- Replies: 6
- Views: 309
Re: 6..36dB VCF Lowpass/Highpass
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...
- Thu Jan 21, 2021 6:10 am
- Forum: Music Tech DIY
- Topic: THAT4305 Compressor: Adjustments
- Replies: 3
- Views: 158
Re: THAT4305 Compressor: Adjustments
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...
- Wed Dec 16, 2020 12:26 pm
- Forum: Music Tech DIY
- Topic: EATYOURGUITAR WEBSITE DOWN FOR GOOD
- Replies: 17
- Views: 1084
Re: EATYOURGUITAR WEBSITE DOWN FOR GOOD
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.
And music theory is based on mathematics.
- Fri Nov 06, 2020 4:37 am
- Forum: Music Tech DIY
- Topic: ? Headphone selector switch bevore the preamp, any impedance problems to expect ?
- Replies: 4
- Views: 151
Re: ? Headphone selector switch bevore the preamp, any impedance problems to expect ?
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.
And expect clicks if switched when power is on.
- Wed Nov 04, 2020 3:27 pm
- Forum: Music Tech DIY
- Topic: Software or function in the arduino itself for monitoring the code?
- Replies: 14
- Views: 375
- Wed Nov 04, 2020 2:40 pm
- Forum: Music Tech DIY
- Topic: Audio signal processing and coding
- Replies: 9
- Views: 470
Re: Audio signal processing and coding
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...
- Wed Nov 04, 2020 2:29 pm
- Forum: Music Tech DIY
- Topic: Software or function in the arduino itself for monitoring the code?
- Replies: 14
- Views: 375
Re: Software or function in the arduino itself for monitoring the code?
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...
- Mon Nov 02, 2020 7:12 am
- Forum: Music Tech DIY
- Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
- Replies: 8
- Views: 413
Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
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...
- Sun Nov 01, 2020 4:54 pm
- Forum: Music Tech DIY
- Topic: Are cem3340s exchangeable with the clones
- Replies: 10
- Views: 481
Re: Are cem3340s exchangeable with the clones
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.
- Sun Nov 01, 2020 2:53 pm
- Forum: Music Tech DIY
- Topic: Multiple Power Supplies
- Replies: 2
- Views: 139
Re: Multiple Power Supplies
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...
- Sun Nov 01, 2020 6:36 am
- Forum: Music Tech DIY
- Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
- Replies: 8
- Views: 413
Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
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...
- Sat Oct 31, 2020 4:34 pm
- Forum: Music Tech DIY
- Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
- Replies: 8
- Views: 413
Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
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...
- Sat Oct 31, 2020 4:16 pm
- Forum: Music Tech DIY
- Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
- Replies: 8
- Views: 413
Re: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
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...
- Sat Oct 31, 2020 2:33 pm
- Forum: Music Tech DIY
- Topic: Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
- Replies: 8
- Views: 413
Digital Polyphonic Synthesizer with DreamBlaster X2 module - step by step
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...
- Wed Oct 28, 2020 1:05 pm
- Forum: Music Tech DIY
- Topic: Cheap Aliexpress/Ebay parts directory
- Replies: 38
- Views: 3879
Re: Cheap Aliexpress/Ebay parts directory
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'...
- Fri Oct 16, 2020 4:51 pm
- Forum: Music Tech DIY
- Topic: Advice on Encoders and OLED's
- Replies: 6
- Views: 259
Re: Advice on Encoders and OLED's
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).
- Fri Oct 16, 2020 3:09 am
- Forum: Music Tech DIY
- Topic: Coolaudio 3046 transistor array clone
- Replies: 23
- Views: 931
Re: Coolaudio 3046 transistor array clone
^ 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 ...
- Thu Oct 15, 2020 5:30 pm
- Forum: Music Tech DIY
- Topic: Coolaudio 3046 transistor array clone
- Replies: 23
- Views: 931
Re: Coolaudio 3046 transistor array clone
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...