Search found 247 matches

by galanter2
Tue Mar 27, 2018 7:31 pm
Forum: Eurorack Modules
Topic: Pittsburgh Lifeforms
Replies: 400
Views: 60236

Just another report to confirm that whatever problems the early SV-1's had, it appears as if they have been solved at this point. I bought an SV-1 used and the tuning was a bit off. I sent an email asking a question about calibration, and without my asking they advised that there had been more than ...
by galanter2
Sun Sep 13, 2015 4:49 am
Forum: Music Tech DIY
Topic: Voltage Controlled Lights
Replies: 25
Views: 4266

One thing to keep in mind is that the eye has a quasi-logarithmic response to light. So, for example, if you drive PWM to vary the brightness of LEDs with a sawtooth control voltage, the LED will get very bright quickly, and then for much of the range not get much brighter at all. To make the LEDs l...
by galanter2
Wed Aug 05, 2015 10:32 pm
Forum: Eurorack Modules
Topic: Improve the O'Tool
Replies: 336
Views: 31149

I bought one of these recently and am considering how I might "panelize" it for Eurorack. It's no substitute for a bench oscilloscope, but it has additional modes including a (simultaneous) signal generator, spectrum analyzer, and metering. It's a bit large, but for the price some may want to consid...
by galanter2
Wed Jul 22, 2015 9:01 pm
Forum: Music Tech DIY
Topic: Arduino Music Projects?
Replies: 17
Views: 1819

There are support libraries to make it easier to interface an Arduino to Max/MSP for the purpose of reading sensors or making instruments and interfaces…but that's all control rate stuff.

Is there a way to create *audio* rate Arduino software using Max/MSP? I'm not aware of such a thing.
by galanter2
Wed Jul 22, 2015 1:45 am
Forum: Music Tech DIY
Topic: THAT 2180 based VCA with both linear & "log" r
Replies: 7
Views: 1326

L-1, thanks for the response. I see on one of your other posts that there's a 150K resistor that must be changed to 61K (I think that was it) for linear response. Unfortunately without a schematic of your design I'm not sure how to use that information. Is your design published somewhere, or is ther...
by galanter2
Mon Jul 20, 2015 10:46 pm
Forum: Music Tech DIY
Topic: "Mutable" PCB's, delight in the selection
Replies: 1056
Views: 83188

For the Tester how does the display attach to the PCB? Presumably with a row of header pins, but they are all on one side and the other side will then "float" above the PCB…not sure about the mechanical durability of that. Also…what value should be used for the unmarked resistor above the display? ...
by galanter2
Mon Jul 20, 2015 8:27 pm
Forum: Music Tech DIY
Topic: "Mutable" PCB's, delight in the selection
Replies: 1056
Views: 83188

For the Tester how does the display attach to the PCB? Presumably with a row of header pins, but they are all on one side and the other side will then "float" above the PCB…not sure about the mechanical durability of that. Also…what value should be used for the unmarked resistor above the display? (...
by galanter2
Mon Jul 20, 2015 8:21 pm
Forum: Music Tech DIY
Topic: THAT 2180 based VCA with both linear & "log" r
Replies: 7
Views: 1326

Yeah, I figured something along those lines…was hoping for a specific circuit that matches the 2108 well. Something approximate would be OK for sub-audio rates though.
by galanter2
Sun Jul 19, 2015 4:42 am
Forum: Music Tech DIY
Topic: THAT 2180 based VCA with both linear & "log" r
Replies: 7
Views: 1326

THAT 2180 based VCA with both linear & "log" r

I believe the typical THAT 2180 based VCA module will have a (natural to the ear) log response. Does anyone have an example of a circuit that would provide a linear mode?

Also, are the signal inputs for these typically AC coupled, and for CV use in need of DC coupling?
by galanter2
Sun Jul 19, 2015 4:31 am
Forum: Music Tech DIY
Topic: High quality digital reverb module?
Replies: 9
Views: 1329

Re: High quality digital reverb module?

There are some large surface mount reverb-on-a-chip thingies out there. In the DIY domain or commercial products? I've seen some complex chips that include general MIDI and so on, and those look like they are for commercial products. But the project analogmonster notes above uses this one I believe...
by galanter2
Tue Jul 14, 2015 12:50 am
Forum: Music Tech DIY
Topic: High quality digital reverb module?
Replies: 9
Views: 1329

High quality digital reverb module?

There are some large surface mount reverb-on-a-chip thingies out there. Has anyone used one of these to create a Eurorack module? Alternately, is there an off-the-shelf module out there that delivers mixing desk quality reverb? Spring reverbs and inexpensive delay chips have a certain charm, but tha...
by galanter2
Mon Jul 06, 2015 10:36 pm
Forum: Music Tech DIY
Topic: "Mutable" PCB's, delight in the selection
Replies: 1056
Views: 83188

Jacks for Mutable Tester

The BOM I looked at had Erthenvar (http://erthenvar.com/store/jack35mmv) as the source for the jacks used with the Tester. But they seem to be gone.

Is there a known source for these elsewhere? Something someone has actually used and knows for sure are the right size?

thanks!
by galanter2
Wed Jul 01, 2015 5:54 pm
Forum: Music Tech DIY
Topic: "Mutable" PCB's, delight in the selection
Replies: 1056
Views: 83188

Thanks! Following up shortly.

Is the laser cutting case file correct? (Thought I read of some holes being off or some such)

Also is there a definitive display being used, or will any standard 2x16 one work?

cheers,

Phil
by galanter2
Wed Jul 01, 2015 10:35 am
Forum: Music Tech DIY
Topic: "Mutable" PCB's, delight in the selection
Replies: 1056
Views: 83188

Howdy, is the Tester PCB and chip still available? If so is there a link to info as to making payment, sending address, etc?

Thanks!

Phil
by galanter2
Thu Jun 25, 2015 3:16 am
Forum: Eurorack Modules
Topic: Improve the O'Tool
Replies: 336
Views: 31149

I apologize if this has been suggested in a previous post. I haven't read all 12 pages. But it dawned on me that if there was some kind of complex set-up mode needed for a feature, so complex in fact that the feature has been avoided, it might be possible to do the following: go into the set-up mode...
by galanter2
Fri Jun 05, 2015 1:13 am
Forum: Music Tech DIY
Topic: Seeking toggle switches with exaggerated flat paddle lever
Replies: 3
Views: 295

Thanks! That looks like what I need.
by galanter2
Mon Jun 01, 2015 3:36 pm
Forum: Music Tech DIY
Topic: Seeking toggle switches with exaggerated flat paddle lever
Replies: 3
Views: 295

Answering my own question…

I've been able to find some at http://www.aliexpress.com , but as usual the specs are dicey or nonexistent, quality is always an open question, and prices vary wildly…and be careful to figure in the sometimes outrageous "shipping charges."
by galanter2
Fri May 29, 2015 9:47 pm
Forum: Music Tech DIY
Topic: Seeking toggle switches with exaggerated flat paddle lever
Replies: 3
Views: 295

Seeking toggle switches with exaggerated flat paddle lever

As per the subject I'm looking for a stylized flat paddle type toggle switch. The perfect switch will: Have a designer look Mount on a front-panel-parallel PCB Have a small footprint on said PCB Have a depth compatible with a popular high quality brand of pots Come in variations in terms number of p...
by galanter2
Fri Apr 17, 2015 7:36 pm
Forum: Music Tech DIY
Topic: Photocell CV
Replies: 13
Views: 1697

To calculate the approximate optimal resistor R in the above: connect the photocell to a volt-ohm meter (VOM) measure the maximum resistance and minimum resistance by having the photocell in bright lighting and then fully covering it up (making it dark). do this calculation and that's the optimal re...
by galanter2
Fri Apr 17, 2015 9:40 am
Forum: General Gear
Topic: Futuresonus Parva Polyphonic Analog Synthesizer
Replies: 134
Views: 22933

Kickstarter funding has reached it's goal!

Yay! Very much looking forward to taking delivery on one in the next few months!
by galanter2
Fri Apr 17, 2015 9:10 am
Forum: General Gear
Topic: I just backed the Parva Polyphonic Analog Synth Kickstarter
Replies: 2
Views: 733

Woohoo! They just reached their goal! This project is a go!

Looking forward to taking delivery in a few months!
by galanter2
Thu Apr 16, 2015 7:30 pm
Forum: General Gear
Topic: I just backed the Parva Polyphonic Analog Synth Kickstarter
Replies: 2
Views: 733

I just backed the Parva Polyphonic Analog Synth Kickstarter

I just backed this Kickstarter for a new synthesizer: https://www.kickstarter.com/projects/futuresonus/parva-polyphonic-analog-synthesizer They are only 5 units away from their goal…so check it out because it looks like it's going to happen. No keyboard. But an all analog audio path. 8 Analog voices...

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