Synthesizing waveforms with a frequency divider - a sequel

video upload by organfairy

"I show how it sounds at 4:17 and play it with a keyboard at 5:50

Winter is getting closer so this is the time of year when I start building things. The first of my projects is a revisit to an old idea of synthesizing waveforms with a frequency divider. This time the waveform in question is a sine wave and some other waveforms derived from it.
The old idea is here: • Synthesizing waveforms with a frequency di... [below]
The project is quite a bit more complicated than the previous 'digital' waveform synthesizer as the sine wave is very..... well....wavy, as there are no straight lines like there is in the triangle and sawtooth waves. Therefore I had to take a different approach using a couple of 74LS138 3-8 decoders and an awfull lot of resistors.

The music is my attempt at playing something relaxing on my Wersi Prisma DX-5 organ."

Synthesizing waveforms with a frequency divider

video upload 8 years ago by organfairy

"The demo starts at 4:15.

The normal approach to generating waveforms is to start with a sawtooth wave and then fold it into a triangle wave and schmitt trigger it into a square wave. But it is also possible to synthesize the waveforms by means of a frequency divider and some logic gates. Off course the generated waveforms will be somewhat 'edgy' but that can probably be filtered out and some people might even find it usefull.

The music is something I made back in 2005 on the homemade synthesizers I had then. It's not the best piece I have made but I am still willing to take responsability for it :-)"