[sdiy] Jürgen Haible living VCO core

[Liam Wall]

> Grab a copy of Franco's "Design with Operational Amplifiers and Analog
> Integrated Circuits".  In my international edition section 12.4
> discusses a practical log amp and includes a diode to prevent the
> reverse biasing of the LM394 base-emitter junctions causing damage or
> degradation.
>
> Neil

Thanks, I will try to find a copy,