Some users have reported oscillation problems which arise from connecting certain op
amps, such as the 741 type, to the node of RS1, RS2, and RS3. Although any such
oscillation could be eliminated by putting a capacitor across the feedback resistor of the
op amp, this would affect the input of A1 in an unacceptable fashion.
If the op amp which you use gives rise to a similar problem, there are two simple ways to
deal with this. You may either a.) use an op amp which is pinned out for external
compensation, such as the LM108 series or the LM607; or b.) connect the input of the op
amp to the junction of a separate pair of resistors, rather than using the RS1 - RS2 pair
(which are part of the desensitizer net). If this second approach is used, you may also
use larger resistor values to minimize the current draw.
As a matter of information, ANADYNE is currently implementing a new version of the L-
17C which will incorporate several significant improvements, among them being
elimination of the need for dual- tracking voltage regulation.
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