https://github.com/elecgeek/pulsesgene

Fun project to produce (only) pulses as the MultiSignalGene do, with analogue circuits and FPGA or 74HC logic circuits.
https://github.com/elecgeek/pulsesgene

electronics fpga-programming ghdl hardware logic-circuit pcb-design spice vhdl vhdl-code yosys

Last synced: about 1 month ago
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Fun project to produce (only) pulses as the MultiSignalGene do, with analogue circuits and FPGA or 74HC logic circuits.

• Host: GitHub
• URL: https://github.com/elecgeek/pulsesgene
• Owner: ElecGeek
• License: gpl-3.0
• Created: 2023-03-15T20:27:18.000Z (over 2 years ago)
• Default Branch: pulses_separ
• Last Pushed: 2025-06-19T14:48:13.000Z (4 months ago)
• Last Synced: 2025-07-13T22:26:39.875Z (3 months ago)
• Topics: electronics, fpga-programming, ghdl, hardware, logic-circuit, pcb-design, spice, vhdl, vhdl-code, yosys
• Language: VHDL
• Homepage:
• Size: 184 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README
  • License: LICENSE

Awesome Lists containing this project

README

          
This is a FUN project to implement the pulse audio waveform of the MultiSIgnalGene.

It is an electronic version based on 74HC logic circuits and operational amplifiers. The schematic diagrams, the parts list, the tests and a PCB are provided. 

 

There is an FPGA version of the numerical part as well. It is based on the VHDL export of the numerical schematic (initially intended for testing).

To interface with the software project, it should be set to sine output audio. This project inputs the sine audio.

The project is based on gEda/Lepton-eda and NG-Spice.

The project contains only the sources. To get exports of the schematics, parts lists, synthesis, spice circuits or (later or never) the spice results, check in the artefact

The FPGA does not involve any PCF file as for now, no PCB is planned.

One can re-run everything, especially to include a PCF. The Makefile is provided. Ghdl, Yosys, Icestorm and Nextpnr software should be installed.

The width of the pulses can be adjusted, while keeping the symmetry.

The input is a square or a sine signal, the pulses are generated using the peak (positive or negative) of the input.

It has been only tested at a functional level. Especially, the operational amplifiers model are very basic.

DO NOT reuse the models for another simulation. They have been designed as "simple stupid" in order to speed up spice.

The parts-list points LF355 operational amplifiers, many can be used

The X1 is a preamplifier, according to the input level, its resistors should be adjusted

The counters U13 and U14 does not use the reset (which is done by load 0). Then both 74HC161 and 74HC163 can be used

The counter U14 does not count above 7. Then 74HC160 and 74HC162 can be used as well.