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

Neil Harper metadata at gmx.com
Sun Jun 19 00:13:06 CEST 2022

On 6/18/22 08:14, Phil Macphail wrote:
> I think this is the most likely cause suggested so far. If the expo transistor is driving an LM13700 then there is around 10 volts across one transistor, and 0.7 across the other. SMT transistor pairs are usually not monolithic so differential heating is very likely. Placing a resistor in series from the transistor to OTA will significantly reduce the thermal mis-match,
> Phil

Interesting, thanks Phil. I can try the resistor, is there any rough
values I should start with? I will also try Ian's suggestion and report

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

More information about the Synth-diy mailing list