Karl,
The LM118 has a dramatically different input circuit than the TL072. This VCO
cirucit is decidedly non-linear in its operation, as it has diodes in the signal
paths. Thus, the input circuit behavior will have an effect.
Do not be surprised that this amplifier substitution could cause trouble.
On 8/25/2016 3:56 PM, karl welty wrote:
Be curious... I built it exactly per the schematic with the exception
of LM118's instead of a TL072 as shown. So... why it operates in an
inverse fashion... yeah, maybe some simulation is called for !
--
David Forbes, Tucson, AZ
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