JBL SG520 - Page 11

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1000
FREQUENCY IN CYCLES PER SECOND
FIGURE 3-4 LOUDNESS COMPENSATION
IN DB
RESPONSE
TI t + Areeea * = Se Tn ore pas ue nares air 7 * i : +t 1
2
3
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20
100
1000
10000
20000
FREQUENCY IN CYCLES PER SECOND
FIGURE 3-5 TONE CONTROL
3.3 OSCILLATOR DETAILS
The 1000-cycle test oscillator is contained on an individual circuit board which is powered from
the regulated —21-volt supply. The circuit consists of transistor Q401 (PNP) connected as a
common-collector oscillator. In this oscillator the feedback is between the base and emitter. The
collector does not carry a signal.
10
CuHart No. S-$01-D (s01)