Search found 27 matches

by julios
Mon Oct 19, 2020 9:08 am
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 15
Views: 472

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

Thanks!
One more thing, how many usefull octaves with the BCM857/4? Should i go straight for the That3340 for a more acurate tuning?
by julios
Mon Oct 19, 2020 8:52 am
Forum: Music Tech DIY
Topic: Eagle Files - VCO, Filters, Touch, and SeqSw
Replies: 15
Views: 472

Re: Eagle Files - VCO, Filters, Touch, and SeqSw

Nice work!
About the vco, is it running até +/-12?
by julios
Mon Sep 28, 2020 9:12 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

Image

Sorry for keeping coming back :doh:
So, if i change the 22k resistor from the scale pin to a 47k and the 50k to 100k and wire the pots between +/-5V like this i'll have (more or less) a 10 octaves range ?
Or should i wire the tune pot between +10V/0V?
by julios
Mon Sep 28, 2020 8:25 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

:tu: Got it! thanks for the information!
by julios
Mon Sep 28, 2020 8:12 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

The EXPO FREQ pin is a ground-referenced current input, limited to the range 0 to 200 uA. No negative current. As to what that means depends on the voltage-to-current resistors and the current going into the SCALE pin. The example given in the datasheet is for 20uA/octave (49.9k resistors), which i...
by julios
Mon Sep 28, 2020 6:01 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

I'm considering powering the negative rail at a higher negative voltage (maybe -10v?) so i can have more than 10 octaves range (for LFO purposes). Has is on the datasheet, with -5/+5 power what octave would be 0V at the 1v/oct input? If it's C0 (give or take) that would mean i would only have a 5 oc...
by julios
Mon Sep 28, 2020 4:58 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

BugBrand wrote:
Sun Sep 27, 2020 4:05 pm
Here's an eagle library I made based on the QFN layout - not particularly elegant but give it a try.
Not checked in detail yet - please give feedback if you use it.

ssi2130.jpg

1_SSI2130.zip
:tu: Thank you Mr. Bugs!
by julios
Sun Sep 27, 2020 1:40 pm
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

adam wrote:
Sun Sep 27, 2020 10:32 am
looks like you also need a resistor to gnd

Image
Thanks!

Is that an open schematic? would be cool to take a look at a schematic from someone else better than me for reference
by julios
Sun Sep 27, 2020 6:31 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

If an eagle footprint is available i'll be very happy! Drawing such a complex footprint makes me nervous... I’ve done one - just need to check it properly.... not had much time this week though... Cool, i'm looking forward for this :) thanks I was looking at the datasheet, how would one connect the...
by julios
Sat Sep 26, 2020 9:29 am
Forum: Music Tech DIY
Topic: Updated SSI2130 VCO Datasheet available...
Replies: 90
Views: 2619

Re: Updated SSI2130 VCO Datasheet available...

If an eagle footprint is available i'll be very happy!
Drawing such a complex footprint makes me nervous...
by julios
Sat May 16, 2020 7:22 am
Forum: Music Tech DIY
Topic: Best tracking diy VCO?
Replies: 5
Views: 444

Best tracking diy VCO?

Hello,

I'm searching for a new VCO to build, but i want it to track really well (5 or 6 octaves). No need for any fancy functions, just really good tracking.

Apart from all the CEM VCOs around, what would be my best option?
I'm also not looking for kits or pcbs, schematics only.

thanks!
by julios
Tue Apr 14, 2020 7:46 am
Forum: Music Tech DIY
Topic: CGS VC-Slew limiter question
Replies: 3
Views: 187

CGS VC-Slew limiter question

Hi!

Can the lm3900 on this CGS VC-slew limiter be replaced by a regular opamp? Norton amplifiers are special little things that i'm not familiar with, that's why i'm asking
Thanks!

Image
by julios
Tue Feb 04, 2020 4:58 pm
Forum: Music Tech DIY
Topic: A new thru zero triangle core VCO
Replies: 239
Views: 16723

Re: A new thru zero triangle core VCO

Also, I have ordered a bunch of panels from MetalPhoto Cincinnati instead of my usual route of getting black anodized/laser etched panels from China. I am happy to say I'm actually getting them a little cheaper from the US source and hoping the MetalPhoto process looks great! :tu: Sorry for the of ...
by julios
Sat Feb 01, 2020 7:08 am
Forum: Music Tech DIY
Topic: Tama ts-305 schematic question
Replies: 1
Views: 207

Tama ts-305 schematic question

Hi I'm considering putting the tama ts-305 on a breadboard, but i'm studding the schematic first. Looks simple, but i can't figure out what the CP1~5 points are. Are this measuring points? http://www.florian-anwander.de/tama_ts305/Basic.jpg full schematics are here: http://www.florian-anwander.de/ta...
by julios
Thu Jan 30, 2020 1:07 pm
Forum: Music Tech DIY
Topic: Strange symbol, what's this thing?
Replies: 1
Views: 258

Strange symbol, what's this thing?

Looking at the tama ts-305 schematic i came across this simbol:
Image

full schematic
http://www.florian-anwander.de/tama_ts305/Basic.jpg

is this a pot with 4 legs? :bang:
by julios
Sat Dec 07, 2019 10:43 am
Forum: Eurorack Modules
Topic: ADDAC215 Dual S&H+
Replies: 46
Views: 2943

Pretty clever. For such a low HP module it does pack a lot of functionalities. Anyone knows if this will available in DIY?
by julios
Fri Dec 06, 2019 12:38 pm
Forum: Eurorack Modules
Topic: Muting options for percussion
Replies: 14
Views: 772

Halfgeleider wrote:Look at divkid mutes
https://www.modulargrid.net/e/divkid-mutes
+1 to Divkid's Mutes, super simple and also DIY
https://www.thonk.co.uk/shop/mutes/
by julios
Fri Dec 06, 2019 12:34 pm
Forum: Eurorack Modules
Topic: Aggressive, diverse and interesting filters
Replies: 63
Views: 4546

Both ADDAC 603 Triple Bandpass Filter and Addac 611 Tube filter comes to mind. Pick your poison, the 603 Triple Bandpass filter has a x100 gain switch for insane distortion and the 611 tube filter is also super gainy if you want it to :party: [video]http://www.youtube.com/watch?v=5kVyKT9z_KQ[/video]...
by julios
Mon Nov 11, 2019 9:45 pm
Forum: Music Tech DIY
Topic: Teensy GND and AGND
Replies: 2
Views: 717

Teensy GND and AGND

Hello! I'm drawing a Teensy board with the SGTL5000 audio codec to use it in the modular environment. I'm a bit confused with the Teensy Ground and Analog Ground pin. Should i use the Teensy Ground as a digital ground and only plug the SGTL5000 there, leaving the Analog Ground to my Analog parts?(op...
by julios
Thu Oct 31, 2019 5:32 pm
Forum: Music Tech DIY
Topic: Smooth Self Oscillation Resoance ?
Replies: 2
Views: 616

Smooth Self Oscillation Resoance ?

Hi! What techniques are available to keep resonance clipping/distortion in check? I'm building a simple filter, and i want to have self oscillating resonance. This is accomplished but the resonance clipps/distorts very easily. I'm amplifying the signal before sending it back to the opamp, and i'm aw...
by julios
Mon Jul 29, 2019 5:51 pm
Forum: Music Tech DIY
Topic: 2164 expo converter + TH VCO1??
Replies: 12
Views: 877

Still no luck :doh: With the V2164 i can only track 4 octaves for some reason that i can't figure out... Returning to the ca3080/lm13700, i try several NPN configurations also with no luck, does this makes sense? can i only do the exponential converter with PNP transistors for the ca3080? I'm return...
by julios
Wed Jul 24, 2019 9:55 am
Forum: Music Tech DIY
Topic: 2164 expo converter + TH VCO1??
Replies: 12
Views: 877

It tracks for about 4 octaves pretty well, then it goes out of tune. Both Hoshuyama and the datasheet gave me the same results.
I wonder if it's because i'm using the Coolaudio version.

I think it's time to go back to the matched pairs
by julios
Wed Jul 17, 2019 4:53 pm
Forum: Music Tech DIY
Topic: 2164 expo converter + TH VCO1??
Replies: 12
Views: 877

Thanks! i'll try it tomorrow and report back !
i just found your paper on exponential converters, i'll try to wrap my head around it.

One more thing before bedtime, is the VCA3 taking care of the High frequency compensation?
by julios
Wed Jul 17, 2019 4:06 pm
Forum: Music Tech DIY
Topic: 2164 expo converter + TH VCO1??
Replies: 12
Views: 877

I'm using a 13700.
Due to my noobyness I didn't understand completely what you explained about the reversed current and the ~0V, sorry :bang:

do you mean that i should just replace the 13700 ota cell for the 2164, like this?

Image
by julios
Wed Jul 17, 2019 1:32 pm
Forum: Music Tech DIY
Topic: 2164 expo converter + TH VCO1??
Replies: 12
Views: 877

2164 expo converter + TH VCO1??

I'm trying to build an exponential converter based on the 2164 to replace thomas Henry«s VCO1 converter. I've tryid the exponential converter from Osamu Hoshuyama and the new datasheet without any luck http://www.soundsemiconductor.com/downloads/ssi2164datasheet.pdf I have the oscillator core workin...

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