TM11-6625-2948-14+P
i. Sawtooth Amplifier 204, 205. The input to the saw-
and develop a positive going signal across 2R58. The
tooth amplifier is a positive going sawtooth waveform
positive potential applied to 2Q12, which is also quiescent-
developed across the capacitors in the emitter circuit of the
ly cut off causes 2Q12 to conduct dropping its collector to
rate generator. 2Q4 is an emitter follower applying a posi-
ground potential. When the collector of 2Q12 assumes its
low potential state 2Q13 conducts allowing its collector to
tive going sawtooth waveform to 2Q5. The positive going
waveform causes 2Q5 to conduct developing a negative
go positive and somewhat less than +32 volts. The colIector
of 2Q13 is connected to the DELAYED SYNC OUT con-
going sawtooth which is applied across front panel FM DEV
AMPLITUDE control 2R21. The wiper arm of 2R21 routes
nector 2J2 through 2R62.
the output sawtooth waveform through the FUNCTION
g.
Output Amplifier 2Q17, 2Q18, 2Q19.The
switch to the FM OUT connector 2J4. The emitter resistor
output amplifier input transistor, 2Q17, is quiescently cut
of 2Q4 is a potentiometer and is adjusted to achieve a
off and is caused to conduct by applying positive going
proper base level for the output sawtooth.
waveforms to its base. 2Q18, a pnp type, and 2Q19, an npn
j. Power Supply. The power supply develops two regulated
type, act in a complementary fashion. When 2Q17 is in
dc voltages; +32 volts and +5.2 volts. The input power is
cutoff 2Q18 is also cut off and 2Q19 is conducting main-
taining the output seen at OUT output connector 2J5 at
routed through cable W1, power switch 2S6, fuse 2F1,
ground potential. When 2Q17 conducts it causes 2Q18 to
voltage selector switch 2S5 to transformer 2T1. 2T1 steps
conduct and 2Q19 to be cut off allowing the output to rise
the input voltage down to the required level which is then
full-wave rectified by bridge 2B1. The output of 2B1 is
to a positive level somewhat less than +32 volts.
applied to the collector of 2Q20, the +32 volt output
h. Ext Input Amplifier 2Q6, 2Q7. The external input
transistor. The base of 2Q20 is held at +33 volts by zener
applied to the ext input amplifier is applied to the EXT
diode 2CR2. The +32 volt output appears at the emitter
INPUT connector 2J1. The input signal is coupled through
of 2Q20 and is distributed throughout the modulator
the network of 2R22 and 2C12 and applied to the gate of
circuitry. The +32 volt output is also applied to the col-
2Q6. The signal appearing at the gate of 2Q6 may be
lector of 2Q21, the +5.2 volt output transistor. The base
positive or negative and is held to a potential of approxi-
of 2Q21 is held at +6 volts by zener diode 2CR3. The +5.2
mately 2.4 volts due to the clamping action of diodes 2CR5
volt output appears at the emitter of 2Q21 and is used
through 2C12. The drain of 2Q6 is coupled to paraphrase
amplifier 2Q7 which will provide two signals of opposing
integrated circuits.
phase to the front panel SELECTOR switch 2S3.
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