pld wrote: ↑

Thu Nov 12, 2020 12:36 pm

MikeDB wrote: ↑

Thu Nov 12, 2020 11:53 am

May just be that the Teensy DAC cannot output more than 2.5V (2.55V) ?

Close. It's using an external DAC that outputs 2.5V.

DOH
Of course. Thanks

I am looking at the O&C schematics for the CV inputs and outputs for a Teensy project I am working on I don't understand why the gain ratio is different from the input side to the output side. 10v peak to peak is divided by 3 on the inputs (to be max 3v3 Teensy max) and then the output is amplified ...

Sure
PM me

yeah, that should work just fine, and will save a lot of hassle. So I got a Teensy 3.6 and programmed a delay with 4 different playheads. Used external MPC4822 DACs. Works really well Thats the first bit of programming Ive done since Commodore 64 days when I was 10 years old. Pretty chuffed with my...

"have a long string of events, rather than everything happen immediately as a result of clock divisions. was thinking what else can delay events (in time).. comparators and logic would be helpful. the goal is to have synced events and shapes of CV not always immediately obvious, but still in time f...

yeah, that should work just fine, and will save a lot of hassle. So I got a Teensy 3.6 and programmed a delay with 4 different playheads. Used external MPC4822 DACs. Works really well Thats the first bit of programming Ive done since Commodore 64 days when I was 10 years old. Pretty chuffed with my...

gis_sweden wrote: ↑

Fri Oct 09, 2020 8:27 am

VCV-rack 5 cell Quantussy. Cant do them on my modular anymore. I have sold some CVLFOs and S/Hs.
https://freesound.org/people/gis_sweden/sounds/538718/

Ooooooh yeh - I like that

I have 2 Ornament and Crime modules
My friend said why don't we remove a couple of apps and program a new one. We can use the 4 DACs to produce 4 delayed envelopes with random Delay Time
Do you think that would be feasible

was it with a particular library that you wouldnt be able to read from multiple ADCs? the teensy3.6 has 25 ADCs and 2 DACs. you should be able to interleave readings just fine. the only trick will be to ensure a consistent sample rate on the envelope ADCs. Ah yes. It was an audio development librar...

So I had a look into Teensy As I understand it for a 2 channel design I won't be able to use extra Analog Read for values of Delay Rate CV and potentiometer when I am recording into the ADC. I can use ADC0 for the input CV and ADC1 for CV/potentiometer. Otherwise to record 2 channels and sample 2 mo...

OK thanks for the info. I've never looked into micro controllers so please forgive my ignorance. If I use a Teensy with 2 ADC and 2 DAC - I could get 2 independent DC delay units ? If I use standard 0-5v envelopes scaling would be quite simple. But scaling of bipolar CV for the Delay Time would be a...

guest wrote: ↑

Fri Oct 02, 2020 9:25 am

the pt2399 is digital inside. you could either replicate that with your own circuits, or use a BBD chip. it would be pretty easy to make your own sigma delta delay with an opamp and memory IC. whats the max delay time you want?

With CV control of delay time?
Can BBD chips go down to DC?

MikeDB wrote: ↑

Fri Oct 02, 2020 5:03 am

Wouldn't it be simpler to delay both signals using the ADCs and DACs of an STM32F103 Blue Pill that costs about £1.50 ?

Yeh I think you're right. Ive never played with digital stuff before but it looks like nows the time

Ok thanks anyway
I can do what I want with the modules I have but I wanted to do it with one dedicated module. Preferably a twin unit in a 1mu space

Great - thanks very much. I noticed on the data sheet it shows about 30ms being the shortest recommended time (at least on start up) Can it go much shorter than 30ms? Any adverse effects? I was hoping to go as short as 5ms. And 30ms being long. I want to use it to double up very fast rhythmic envelo...

Can you share your schematic?

Yes, I built a DC coupled PT2399 recently. I was thinking more in terms of delaying a frequency control voltage. The problem I had was that the gain was not quite constant as the delay varied, so I couldn't calibrate it so that the output exactly matched the input. The other problem is that if you ...

I would like a circuit whereby I can delay a CV for example a fast envelope with CV control of the delay time
Can the PT2399 be DC coupled? Is it worth experimenting with?
Or does anyone have any other ideas of where to start?

It is I who made the panel

dragulasbruder wrote: ↑

Wed Aug 05, 2020 10:13 am

Amazing - never heard of this guy. Really inspiring

Really nice
Really Kraut and not just pastiche
Loving it

Yes I built them at the same time
I did use 2n39.. transistors in stead of the BC types but I don’t see how that would make a difference
Would voltage followers help?

In 1x16 mode only the master current source is enabled via the switch

Bump

I'm a big fan of this circuit I built one 16 step programmer over 15 years ago and I wanted to build another 2x8 that could be switched to 1x16 I built the 2 modules which work great on their own but then I tried to combine them via a 14p 2t switch. I have used Molex crimp connectors to connect the ...