AW: My new VCO

[Ingo Debus]

Haible Juergen wrote:
> 
>         >this reminds me of my very first "serious" DIY music project, the
>         >Tuenker "Sound Organ". Oscillator was with SCR too, no VCO though.
> The
>         >four sawtooth footages were generated the same way with resistor
>         >networks. No ICs, two frequency dividers on one PCB.
> 
> Real saw wave outputs or just staircase waveforms ? (This makes a big
> difference)

Theoretically real saw (the oscillator had saw output). But I used 10%
resistors back then and the nominal values weren't very accurate (1M,
470k, 220k, 100k). So it didn't look much like a saw.

>         >Another question: Is the + input of the TL071 really connected to
> two
>         >caps only?
> 
> No.
> The GND connection here.

Ah jetzt ja! ;-)

Ingo