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

[Ian Fritz]

Hmmm... I'm pretty sure I asked about slow settling before? That's 
usually a pretty reliable indication of self-heating.

Ian


On 7/20/2022 10:27 AM, Neil Harper via Synth-diy wrote:
> 
> 
> 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
> 
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