Crystal Log Synth - Revision history

Cornish semiconductor at 21:01, 7 June 2026

2026-06-07T21:01:46Z

← Older revision		Revision as of 21:01, 7 June 2026
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	==Mixer==		==Mixer==

	~~Todo~~		Allows four signals to be mixed with level controls for each and a final gain amplifier. In the end these just got set up once and mostly left as the gates level controls were used instead.

			Inputs:

			* 4 audio signals

			Outputs:

			* Output audio signal (can drive headphones on it's own)

	[[Category:Electronics]]		[[Category:Electronics]]

Cornish semiconductor at 20:59, 7 June 2026

2026-06-07T20:59:03Z

← Older revision		Revision as of 20:59, 7 June 2026
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	The synth as a whole is wired together via springs like the cardboard boxes, but is built out of wood.		The synth as a whole is wired together via springs like the cardboard boxes, but is built out of wood.

	~~###~~ Circuits		=Circuits=

	## Square wave fm voice		==Square wave fm voice==

	This is directly based on the workshop circuits - osc1 modulates the frequency of osc2 via a transistor, this feeds into osc3's frequency via the crystal used as a transistor. This is fed into a low pass filter to allow us to remove (or enhance) some of the nastier frequencies the natural crystal provides.		This is directly based on the workshop circuits - osc1 modulates the frequency of osc2 via a transistor, this feeds into osc3's frequency via the crystal used as a transistor. This is fed into a low pass filter to allow us to remove (or enhance) some of the nastier frequencies the natural crystal provides.
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	* Signal		* Signal

	## Sawtooth fm voice		==Sawtooth fm voice==

	![](https://gitlab.com/then-try-this/organised_atoms/-/raw/main/cornish%20semiconductor%20corp/proto/saw.jpg){width=50%}		![](https://gitlab.com/then-try-this/organised_atoms/-/raw/main/cornish%20semiconductor%20corp/proto/saw.jpg){width=50%}
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	* Signal		* Signal

	## Crystal noise generator		==Crystal noise generator==

	This circuit passes a controllable DC current through a crystal and a 1K resistor. The DC is removed by a RC high pass filter and any resulting fluctuations are amplified (X ~100) and passed through a resonant state variable filter. This provides a noise source that is different for different mineral specimens. The voltage passed across the crystal can be controlled, as the noise seems to change based on this and the point contact location.		This circuit passes a controllable DC current through a crystal and a 1K resistor. The DC is removed by a RC high pass filter and any resulting fluctuations are amplified (X ~100) and passed through a resonant state variable filter. This provides a noise source that is different for different mineral specimens. The voltage passed across the crystal can be controlled, as the noise seems to change based on this and the point contact location.
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	* Signal		* Signal

	## Shift register/XOR sequencer with 2 vactrols		==Shift register/XOR sequencer with 2 vactrols==

	Takes a clock signal from volca (or an internal oscillator) and provides resistance changes that can be used in any other circuit as modulation/automation.		Takes a clock signal from volca (or an internal oscillator) and provides resistance changes that can be used in any other circuit as modulation/automation.
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	* Resistance 2		* Resistance 2

	## Double shift register/XOR/vactrol		==Double shift register/XOR/vactrol==

	~~Unfinished but will provide~~ 2x8 bit or 16 bit sequencing with XOR.		Provides 2x8 bit or 16 bit sequencing with XOR.

	Inputs:		Inputs:
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	* 2 vactrol resistances		* 2 vactrol resistances

	## Triple distortion envelope/gate/sequencer		==Triple distortion envelope/gate/sequencer==

	A hacky replacement for the volca modular's low pass gates (which I made heavy use of previously). This circuit does several things in one:		A hacky replacement for the volca modular's low pass gates (which I made heavy use of previously). This circuit does several things in one:
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	* 3 gated/attenuated audio signals		* 3 gated/attenuated audio signals

	## Mixer		==Mixer==

	Todo		Todo

Cornish semiconductor at 19:56, 13 May 2026

2026-05-13T19:56:55Z

← Older revision		Revision as of 19:56, 13 May 2026
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	As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.		As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.

	The ideas was to building up the circuits created from the [Cardboard Crystal synth] we used in previous workshop into things that can be played/listened to a little more easily in a hardware synth form. It was also used as a testing method so prototype ideas for sound generation that use natural semiconductors alongside 'off the shelf' synth hardware. We used it for taking to mines in the organised atoms workshop (where it has to have a kind of presence and playability) as well as recording tracks.		The ideas was to building up the circuits created from the [[Cardboard Crystal synth]] we used in previous workshop into things that can be played/listened to a little more easily in a hardware synth form. It was also used as a testing method so prototype ideas for sound generation that use natural semiconductors alongside 'off the shelf' synth hardware. We used it for taking to mines in the organised atoms workshop (where it has to have a kind of presence and playability) as well as recording tracks.

	Using a volca modular as a temporary(?) solution that provides modules and element we need without having to build them. Voltages seem compatible with what we have been building so far (6V).		Using a volca modular as a temporary(?) solution that provides modules and element we need without having to build them. Voltages seem compatible with what we have been building so far (6V).
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	The synth as a whole is wired together via springs like the cardboard boxes, but is built out of wood.		The synth as a whole is wired together via springs like the cardboard boxes, but is built out of wood.

	# ~~PCBs~~		### Circuits

	## Square wave fm voice		## Square wave fm voice

Cornish semiconductor at 19:55, 13 May 2026

2026-05-13T19:55:55Z

Show changes

Cornish semiconductor: Cornish semiconductor moved page Log synth to Crystal Log Synth

2026-05-13T19:47:42Z

Cornish semiconductor moved page Log synth to Crystal Log Synth

← Older revision	Revision as of 19:47, 13 May 2026
(No difference)

Cornish semiconductor at 19:45, 13 May 2026

2026-05-13T19:45:56Z

← Older revision		Revision as of 19:45, 13 May 2026
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	[[File:log.jpg\|~~1000px~~\|right\|The log synth sitting on some mine waste at Ale and Cakes mine, Gwennap, Cornwall]]		[[File:log.jpg\|500px\|right\|The log synth sitting on some mine waste at Ale and Cakes mine, Gwennap, Cornwall]]

	As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.		As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.

	[[Category:Electronics]]		[[Category:Electronics]]

Cornish semiconductor at 12:51, 1 January 2026

2026-01-01T12:51:06Z

← Older revision		Revision as of 12:51, 1 January 2026
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			[[File:log.jpg\|1000px\|right\|The log synth sitting on some mine waste at Ale and Cakes mine, Gwennap, Cornwall]]

	As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.		As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.

	~~[[File:log.jpg\|w=1000\|The log synth sitting on some mine waste at Ale and Cakes mine, Gwennap, Cornwall]]~~

	[[Category:Electronics]]		[[Category:Electronics]]

Cornish semiconductor at 12:49, 1 January 2026

2026-01-01T12:49:29Z

← Older revision		Revision as of 12:49, 1 January 2026
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	As part of our workshops at Ale and Cakes mine, ~~I made~~ a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.		As part of our workshops at Ale and Cakes mine, we used a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.

			[[File:log.jpg\|w=1000\|The log synth sitting on some mine waste at Ale and Cakes mine, Gwennap, Cornwall]]

	[[Category:Electronics]]		[[Category:Electronics]]

Cornish semiconductor at 16:02, 31 December 2025

2025-12-31T16:02:47Z

← Older revision		Revision as of 16:02, 31 December 2025
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			As part of our workshops at Ale and Cakes mine, I made a prototype 'crystal log synth' that kids could plug their crystals into to make techno music.

	[[Category:Electronics]]		[[Category:Electronics]]

Cornish semiconductor: Created page with "Category:Electronics"

2025-12-31T15:13:07Z

Created page with "Category:Electronics"

New page

[[Category:Electronics]]