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Making analog synth
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MaestroS



Joined: Sep 11, 2018
Posts: 7
Location: Poland

PostPosted: Tue Mar 10, 2020 4:54 am    Post subject: Making analog synth
Subject description: A few questions
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Hello, i started making an analog synth, and i have a few questions. So:

1. PSU should be built using linear regulators or switching power supply? Which way of making it is better in audio purposes?

2. MIDI-CV converter. I want to build multiple voices, so there should be also multiple cv-outs from uC, yup? How it should work when i press multiple keys? I think of building converted using some ARM uC and programming midi messages to UART receive. It just work by simply fast switching multiple uart mesages and sending them to uC when multiple midi keys are pressed?

3. Vco's sync. I want to use 3xVCO in one voice of the synth. Should i hard/soft sync them? Whats the purpose of soft/hard synchro?
Thats for now, thanks for help :p
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Grumble



Joined: Nov 23, 2015
Posts: 1085
Location: Netherlands
Audio files: 29

PostPosted: Tue Mar 10, 2020 6:08 am    Post subject: Re: Making analog synth
Subject description: A few questions
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MaestroS wrote:

1. PSU should be built using linear regulators or switching power supply? Which way of making it is better in audio purposes?

For a solely analog synth the best way is to use a linear power supply, because the switching power supply could very well increase your noise level by injecting relatively high frequency (around 80 kHz) noise into the synth.
While this is not audible, it could provide some audible noises by way of interference (the switching frequency might and probably will be depending on the load).
MaestroS wrote:
2. MIDI-CV converter. I want to build multiple voices, so there should be also multiple cv-outs from uC, yup? How it should work when i press multiple keys? I think of building converted using some ARM uC and programming midi messages to UART receive. It just work by simply fast switching multiple uart mesages and sending them to uC when multiple midi keys are pressed?

Yes and yes, there are numerous ways to accomplice this, search on this forum.
MaestroS wrote:
3. Vco's sync. I want to use 3xVCO in one voice of the synth. Should i hard/soft sync them? Whats the purpose of soft/hard synchro?

If you build (e.g.) a CEM3340 VCO you have both.
Quote:
The CEM3340 is extremely unusual in that it offers both Hard and Soft Sync inputs (pin 6 and pin 9), and neither of them work the way you might expect. As we’ll see, this lead to them being widely ignored. However, the datasheet does offer alternative circuits for synchronization which can give you the classic sync effect, and manufacturers seem mostly to have gone with variations on this instead. The datasheet’s claim that their inputs “provide a wider variety of synchronized sounds than available through conventionally synchronized oscillators” seems to have fallen on deaf ears.

_________________
my synth
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elmegil



Joined: Mar 20, 2012
Posts: 2117
Location: Chicago
Audio files: 16

PostPosted: Thu Mar 12, 2020 4:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Using 3 VCOs as a single voice, you generally get the "fatness" that is much desired without doing sync. The oscillators lightly beating against each other gives it this quality.

Sync, particularly hard sync, is more of an FM-like effect. If you're familiar with the song "Let's Go" by the cars, the main synth riff in that song uses hard sync, and there's a characteristic cutting edge to the sound. This is accomplished by changing the pitch of the locked VCO -- it stays in tune with the master, but the wave shape changes as it is changing the underlying pitch. There are probably youtube videos showing what this looks like on an oscilloscope.
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MaestroS



Joined: Sep 11, 2018
Posts: 7
Location: Poland

PostPosted: Mon Mar 23, 2020 2:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys!
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