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Buchla made the 148 Harmonic Generator in 1969. It is a sawtooth oscillator core, the same as the 158, with waveshapers creating 9 harmonics above the fundamental. The even harmonics are created with full wave rectifiers doubling lower frequency triangles. The odd harmonics are shaped using a series of diode clippers that mix the triangle with a clipped version to make a higher frequency triangle. The effect is a wavefolder, the precursor to the Timbre circuit in the 259.
I built a modified version of that design 10 years ago. The original has no -15volt rail, so it AC couples the signal in many places. I eliminated all these caps and powered the circuit from +/-15 volts. I never got the quality of the waveforms to where I wanted them. I have since worked on a Buchla 148 and found the waveshapes to be about the same as my clone. They sound a little wavetabley, especially the higher odd harmonics.
Legend tells that Buchla made a version of the Harmonic Generator for the 200 series. It was based on the design of the 148, but had a few extra parts added. It had reversing attenuators on the CV ins and an output mixer with sliders and even/odd outs. I have never seen this module and don't even know the model number.
10 comments:
Production, or a one-off?
Like all of my modules, made one at a time for interested users.
Looks quite interesting. Got any samples?
Sup Mark
I'm game!
Drop me an e.
Than-ku!
Cheers,
Renzo
Looks great (email sent). Is the sawtooth oscillator core based on the 158, like on the 148, or is it based on your 258v?
Nice work!
Audio? Prices?
Great stuff, i always wanted to try the 100 series one.
My mouth is watering considering the awe-inspiring 258v I own...How much???
samples PLLLLZZZZZ!
eaacks 17You have done nice job..Keep sharing like this.
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