i plan doing a presentation on analog sound synthesis for physics class (grade 13 in Germany ).
A few years ago i started to experiment with synthesizers which led to buying a Bass Station Synth....had to sell it last year unfortunately...
In physics classed we discussed the topic of RLC-circuits for quite a while, but i still have some questions concerning the functionality of a VCO-unit. I hope someone can help me out.
Thanks in advance!
Are those RLC-units actually used in common synthesizers? A book i read makes me doubt that, but i couldn't figure it out.....the following images will explain....
We discussed this RLC-circuit which is an Armstrong/Meissner-Oscillator an can be used to create a sine tone with variable frequency altering inductance or capacitance.
In the VCO-Chapter of a book about analog synthesizers the oscillator unit is described not as an RLC-circuit but as shown on the picture above.
a capacitor is charged until its voltage is just a high as a certain reference voltage. The capacitor then gets short-circuited and the charging begins anew.
This process creates obviously a sawtooth-waveform
The thing that confuses me, is that the author describes how the above created circuit is used in most modern synthesizers. According to him even synthesizers with a sine-oscillator just modulate and bend a triangle or sawtooth waveform into a sine.
Why don't they use an RLC-circuit? Is it unstable for musical use?
greetings from Germany