Hi Jon

You could Google for "sine wave" op amp. Several pdfs found

A classic example is a thermistor, something like an RA53, in
the feedback loop, but that particular one seems to be a bit
pricey these days

If you want to do some experimenting, this was suggested
some time ago by Dave Dilatush (Dave's Dong I called it,
which he took with good grace)

http://home.clear.net.nz/pages/joecolquitt/davedong.html

> Furthermore, I need six of these outputs, which switch on
> together

An op-amp should have enough drive. You can use logic
gates, eg 4001, 4011 etc, in their linear region as rudimentary
amplifiers, but characteristics vary between manufacturers.
Although they do work well as drive buffers

If you're having trouble with the timing, may I suggest you
leave the oscillator running all the time and "gate" it on with
a FET or similar for the actual time you want. That is, short
the outputs to ground (check op amp specs) or use a FET
or transistor as a series switch

As for the noise, you'll need screened cables, probably
ferrite beads, earthed metal box, bypass caps, filter caps,
perhaps chokes and diodes/resistors on the supply line


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