Doepfer

> I've been trying to set up the frequency multiplication patch
> with the A196 Phase Locked Loop and I had a few questions. I'm
> also using a Blacet Frequency Divider.
>
> What I'm trying to do is double or quadruple some clock signals
> from the square output of my Blacet MicroLFO. I set up the patch
> on page 6 of the manual, but the output doesn't seem to be
> doubling the frequency. I'm getting an output that appears to be
> slower than the original output of my Blacet LFO. I want to use
> the signals to trigger a couple of envelopes.
>
> What postition do I want the VCO offset and the filter frequency
> at for multiplication? Does it not work on lfo signals? I'm
> pretty sure the original signal is higher than 2Hz which is the
> lowest value mentioned in the manual.
>
> Thanks for any hints on this.
>
> Bryan

The A-196 PLL module was developed for audio frequencies. The 2Hz spec
refers to the minimum frequency of the internal VCO. To process a 2Hz signal
the low pass should be about 1/10 i.e. 0.2 Hz. The range of the built in
simple R/C low pass is about 20 Hz ... 1kHz. For lower frequencies an
external low pass as mentioned on page 5 of the manual should be used. It
has to be DC coupled (e.g. the A-170 slew limiter).

Best wishes
Dieter Doepfer