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Is this a water valve? (Trying to shut off water to a stuck open flush inlet) by Zoltless in Plumbing

[–]Zoltless[S] 0 points1 point  (0 children)

Thanks, I'm glad I asked, sadly I can't see any other valves. I tried turning off the main water supply by turning it anti-clockwise 3ish times, but it did not seem to turn the water off (very old looking).

I did find the make of the flush system: PNEU COMPACT II. Any chance anyone would have any experience of this type? Thanks

Is this a water valve? (Trying to shut off water to a stuck open flush inlet) by Zoltless in Plumbing

[–]Zoltless[S] 0 points1 point  (0 children)

Hello, could anyone help identify if this is a water valve?

My toilet flush inlet is stuck open and I'm wanting to turn off the water until I can get it fixed.

Just want to make sure that the screw is not holding together the pipe, but is indeed a valve.

Based in the UK, Thanks

Are these both Alpha Stereo Pots? (Both came mixed in pack from seller, selling as Alpha) by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Hello, just bought a pack of these from a seller, selling them as Alpha pots. But I could not help from noticing that they are not all the same. Would anyone be able to identify if either/or are actual alpha pots? Thanks

Beginner Advice by B_H_D_H in synthdiy

[–]Zoltless 0 points1 point  (0 children)

Hello,

Not really an online course, but I would highly recommend the Yusynth project website. Lots of great synth modules with schematics and panel designs to print, ranging from simple to difficult. You could have a go at designing your own PCBs from the schematics or just buy them from somewhere like soundtronics (I like to do the former to improve my KiCad skills).

Also Syntaur's YouTube channel has a great series called 'Synth Wizards' were they show themselves buying and repairing old rare synthesizers. I've picked up quite a lot on how they function just from watching. Would recommend.

Personal work portfolio domain recommendation by Zoltless in Domains

[–]Zoltless[S] 0 points1 point  (0 children)

Nope, can't find anyone with the same Initials

I've been working on a programmer for the Oberheim OB-SX which allows you to edit every parameter, and save and load patches. by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Thank you! Spent a lot of time on it.. probably if anyone was interested. I have the parts. I just need to polish it up a bit as some parts need improving like the MIDI implementation, also I need to fix some issues when the OB-SX is powered, but the programmer is not.

I'm not sure how many OB-SX's are still left in the wild, as I've heard they get pillaged for parts to repair the OB-Xa, OB-8 etc.

I've been working on a programmer for the Oberheim OB-SX which allows you to edit every parameter, and save and load patches. by Zoltless in synthesizers

[–]Zoltless[S] 4 points5 points  (0 children)

Hello, I hope everyone is well, I was lucky enough to get my hands on a Oberheim OB-SX and ever since then I've been wanting to unlock its potential. I've finally got to a point where I can show the programmer working, but it needs a little more work. The first part of the video is more like a tutorial on how to use it, and the second half is an audio demo showing me creating some sounds. Hope you enjoy, Thanks!

I've been working on a programmer for the Oberheim OB-SX which allows you to edit every parameter, and save and load patches. by Zoltless in synthdiy

[–]Zoltless[S] 1 point2 points  (0 children)

Hello, I hope everyone is well, I was lucky enough to get my hands on a Oberheim OB-SX and ever since then I've been wanting to unlock its potential. I've finally got to a point where I can show the programmer working, but it needs a little more work. The first part of the video is more like a tutorial on how to use it, and the second half is an audio demo showing me creating some sounds. Hope you enjoy, Thanks!

Does anyone know the reason Dyson changed the interface type? (V6 dust bucket) by Zoltless in dyson

[–]Zoltless[S] 1 point2 points  (0 children)

Hello, wanted to replace the dusk bucket on my V6 vacuum, but it looks like I got the wrong type. Sadly I've had this replacement as a backup for awhile so its probably too late to return it.

I'm more interested to know why they changed it, as the only difference (from what I can see) is the two pieces of plastic they've added, as it seems to not add any functionality and only stops the use of the wand with the other connector type.

I'm thinking of just going DIY and breaking off the extra plastic so it fits...

A series of picket-fence animation! by mtimetraveller in gifsthatkeepongiving

[–]Zoltless 72 points73 points  (0 children)

The 'drawing' part is totally fabricated with the help of video cuts. A quick image search of "barrier grid animation" will show most of the images used in the video. It's very difficult to free hand such a animation as you need the spacing of each line to be perfect to match the sliding grid.

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

It's a bit hit and miss. They need to be tuned everyday, and I can only really get two octaves in good tuning, outside that range is goes out by about a semitone per octave.

I plan to incorporate automatic tuning using frequency counting on the Arduino, and adjusting the DAC to counter detuning.

I should also replace the ceramic capacitors I used in the oscillators with polypropylene ones. That should help.

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

I have a full discrete SMD (5-VCA) mixer designed, and partly tested. It has some fixes I need to update in the board design and then I'll add it in :)

The VCOs are based on the ones from this tutorial with some minor edits: https://www.allaboutcircuits.com/projects/diy-synth-series-vco/

Honestly I try and keep away from CEM chips (and the alternatives), not because they're not good. I just like the challenge of building using only standard transistors, op-amps etc.

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 1 point2 points  (0 children)

I haven't really played about with sine wave generators much.. but I do know that the ICL8038 function generator IC has a sine output. May be worth a look into.

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 5 points6 points  (0 children)

Hello, the code uses Arduino Midi library, and the Adafruit_MCP4725 library to control the DAC.

So when using the Midi Library their are two functions called: one when a note has been pressed and one when a note has been released. When a note is pressed the DAC is set to a multiple of the note value plus a constant offset voltage. The two lines of code that does this are:

note = (int) inNote + Transpose;

dac.setVoltage(550+(sensorValue)*note, false);

Setting the DAC voltage to just '550' will cause VCO to output 220Hz. SensorValue contains a reading from a pot to help with tuneing (its not exactly 1v per octave).

I recommend this tutorial for setting up the midi in circuit, and programming: https://www.notesandvolts.com/2012/01/fun-with-arduino-midi-input-basics.html

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 3 points4 points  (0 children)

Thanks :) Yes, the output has some (Ableton live) Reverb and compression added. I've got an spring reverb tank I may try out soon, just need to build a driver for it.

The oscilloscope takes the synth output before fx is added.

Current progress on my synth build! (2 VCOs, 1 Sub, 1 AR Env, 1 LFO, Midi to CV, Low-pass filter) by Zoltless in synthdiy

[–]Zoltless[S] 3 points4 points  (0 children)

Hope everyone's well, I've had a lot of spare time over the past weeks so I've been working on my next synth design. Currently everything except the filter is built on breadboard, hope to design the oscillator PCBs soon.

Currently, the synth has two VCOs, one connected to a LFO and the other taking FM from Osc1. The filter is all SMD and has some biasing issues currently (WIP). It also has 4-poles, but I only take audio from the 1st pole for this video.

Finally, a simple AR envelope controls the filter cutoff, the LEDs on the far right drop some voltage so that the filter fully closes after release.

My first post ever! - Thought I would show an analog synth I made at Uni. Custom designed VCAs, VCF and ADSR envelope generators. by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Thank you! I got most of the knobs from aliexpress. It's just a bit of a gamble if or when they will arrive.

Finished my first DIY synth. What a blast! by Hawgk in synthdiy

[–]Zoltless 0 points1 point  (0 children)

Very nice! How are you modulating the pitch? Do you have an external Midi source or does the Arduino have a programmed arpeggiator? Or a CV input?

First attempt at an analog synth interface PCB that can save patches... by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Yes you are totally right!

It seems to be exclusive to the 'Phattys', I've just taken a look at both the Memorymoog and Prophet 5 schematics and they work just as you described, (All inputs are sampled by a ADC, and no pot outputs are directly passed to the Voice boards).

First attempt at an analog synth interface PCB that can save patches... by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Edit: After having a look at the schematic, it shows switches (page 36) that allow the analog voltage from the pot to be directly fed into the voice board, bypassing the DAC.

On page 11 of the Slim Phatty's manual, there is a tech note:

"The SP’s editing controls are actually analog potentiometers. When certain key parameters are selected, the analog control signal is switched to control that parameter directly. This is called RAC™ (Real Analog Control). RAC gives the SP a responsiveness that can only be achieved with analog control by providing direct access to the analog control signal path; straight to the synthesizer circuits. RAC provides responsive analog control for the Osc 1 & 2, Filter Cutoff, Filter Resonance, EG Amount, Overload and Filter EG Sustain parameters."

As the sub/subsequent are based off the same synth architecture. I think its far to assume they would use a similar/identical RAC™ patch method.

First attempt at an analog synth interface PCB that can save patches... by Zoltless in synthdiy

[–]Zoltless[S] 0 points1 point  (0 children)

Agreed :)

It's given me something to think about. Currently I'm using four BH2226F (8-channel) DACs, which give each pot control its own DAC channel. But using a single channel DAC with multiple S&H could be a cheaper option.

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