Exp Converter

[Paul Perry]

At 03:08 PM 12/06/98 +0200, Jelle Plantenberg wrote:

>I'm trying to build the 6/12/18 db/oct LPF as found on the Synth diy page
>(http://www.uta.fi/~helin/) 
>I hope that someone is able to help me, or that someone has build the same
>VCLPF and is willing to share some info (about the exp converter for
>example) about it.

....well I have built the exp convertor, and used it to run a LM13600
oscillator.

I din't have my notes handy, but possibly when feeding the LM13600 via a 22k
resistor to 
provide a rough voltage to current convertor, the cv is negative, not positive?

By the way, I spoke to the Aust agents for National Semiconductor, who
confirmed my 
suspicion that the LM13600 is deleted (not made now in ANY package).
If anyone could find the status of the Philips equivalent (dip package) I would
appreciate it.

paul perry melbourne australia

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