[sdiy] VCO that goes SHARP in highest octaves??

[Neil Harper]

On 7/20/22 03:35, Phil Macphail wrote:
> Thanks for sharing the results with us all. I originally fitted the resistor for the same reasons Harry mentions when using an LS358 in the expo circuit, where the transistors are closely (thermally) coupled. When I used an SMD transistor pair in an LFO I found that square-wave FM suffered from some thermal effects - the switch to a lower frequency would result in a fast initial change in frequency followed by a slower drift to the final frequency. The series resistor reduced this effect so I have always tried to minimise the power dissipation in any situation where transistor matching is required. I have also used cascode transistors as an alternative to the resistor with similar results,

interesting! I swear i saw this "slow to settle" behavior before too
when switching fast across 4-5 octaves during calibration.

--
/// Neil Harper
/// Every Wave is New Until it Breaks