AW(Magnus): [sdiy] analogue phase modulation

[Ian Fritz]

At 08:52 AM 1/12/2007, harrybissell at copper.net wrote:
>The other hidden feature is that the opamp
>will clip ay some constant level... you NEED
>a really stable power supply here

You may also have issues with unsymmetric clipping and with time lags 
getting in and out of saturation.  Better to use an external clamping 
circuit, IMO.  This helped when I was working on SNIC circuits.

http://home.earthlink.net/~ijfritz/sy_cir10.htm

(See the final circuit, not the introduction.)

   Ian