li-
the attenuating potentiometers when activated, which in turn are connected to the pins
of the output port. (Fig. 6)
When using this configuration, the signal was amplified by a Krohn-Hite 7500
variable-gain amplifier capable of delivering up to 200 volts peak.
Figure 5 The control box. The top view shows activation buttons, attenuating potentiometers,
and protection fuses. The front and rear views on the right show the computer and signal
input.