TM11-6625-2948-14+P
a p p e a r i n g at the UNDELAYED SYNC OUT output con-
(Serial No. 2-60A Thru 2-117A Only)
nector 2J3. The other output is applied to 2IC2 where the
desired output pulse width of 0.2 to 2000 sec is developed
The 115V, 400 Hz power source is applied to terminals
in conjunction with PULSE WIDTH control, 2R76 and
1A10E1 and 1A10E2. 1A10BR1 and 1A10C1 constitute
X1-X10-X200-X1000
switch,
2S7.
2IC2
also
has
two
out-
the full-wave rectifier. The output of that circuit is dropped
puts; one output is applied to the delayed sync amp for
down by 1A10R13 to 12 volts and then supplies the three
1A10U1,
1A10U2, and 1A10U3.
amplitude and impedance conditioning prior to appearing
Integrated circuits
at the DELAYED SYNC OUT connector 2J2. The other
1A10U3 is an operational amplifier and is configured as a
output is routed through the FUNCTION switch 2S2F to
480 Hz square wave generator. 1A10U2 is a five stage
the
output
amplifier
prior
to
appearing
at
the
counter configured for divide-by-eight operation. The out-
puts from 1A10U1, pins 10 and 11 are, accordingly, 60 Hz
OUT output connector 2J5. With the FUNCTION
switch set at its EXT
/INT
position and the SELEC-
overlapping, 25% duty cycle waveforms. These outputs
TOR switch set at INT, the square wave output of the
then
drive
switching
circuit
(1A10Q1,
1A10Q4,
and
1A10Q6) and switching circuit (1A10Q2, 1A1003, and
Schmitt trigger is applied to the
output amplifier
1A10Q5). Thus, the voltage across the fan consists of
and the resultant output at the
OUT output con-
nector is a square wave. With the FUNCTION switch set at
rectangular pulses of alternating polarity. 1A10CR2 and
its EXT
position and the SELECTOR switch set
1A10CR3 conduct briefly after the switching circuit
at its EXT(-) or EXT(+) position, an external signal con-
(1A10Q1, 1A10Q4 and 1A10Q6) turn-off and allows the
netted to the EXT INPUT connector, 2J1, i S p r o c e s s e d
fan current to decrease to zero. 1A10CR1 and 1A10CR4
through the external signal amplifier to the Schmitt trigger.
exhibit similar action in conjunction with switching circuit
(1A10Q2, 1A10Q3, and 1A10Q5).
The output signals appearing at the
OUT, UN-
DELAYED SYNC OUT, and DELAYED SYNC OUT
c o n n e c t o r s 2J5, 2J3, and 2J2 respectively are directly
related to the external input signal applied to the EXT
The MD-1075/URM Modulator is a solid-state function
I N P U T connector 2J1. With the FUNCTION switch set
generator which provides fast rectangular pulses, square
at its FM position and the SELECTOR switch set at INT,
waves and sawtooth waveforms for the generator.
the sawtooth output of the rate generator is processed
through the sawtooth amplifier. The output of the saw-
tooth amplifler is applied across FM AMPLITUDE control
2R21. The wiper of the FM AMPLITUDE control is the
output sawtooth and IS connected to the FM OUT output
The MD-1075/URM
comprised of a group of circuits
connector, 2J4. With the FUNCTION switch set at FM and
IS
which generate, shape and delay the various waveforms as
the SELECTOR switch set at EXT(+), the rate of the rate
required. The rate generator is a free-running unijunction
generator will be synchronized with the rate of the exter-
oscillator which serves to generate the basic pulse repetition
nally applied synchronizing signal provided that the RATE
rates, This circuit is also the source of the sawtooth for
control and X1, X10, X100 switches are set to a rate lower
FM operation. When the FUNCTION switch, 2S2, is set
than the incoming synchronizing rate.
at its INT
position and the SELECTOR switch, 2S3, is
set at its INT position, the pulse output of the rate genera-
2 Flip/Flop, i s
t o r , divided by two by means of the
applied to the Schmitt trigger. The Schmitt trigger output,
a square wave, iS applied to the pulse generator where the
Paragraphs a. through j. contain a detailed analysis of the
output pulses of desired width and delay are generated.
various circuits of the Modulator MD-1075/URM.
T h e pulse generator consists of two integrated circuit
a. Rate Generator 2Q1, 2Q23. The rate generator is a
the desired pulse delay of 2 to 2000 sec in conjunction
free-running unijunction oscillator. With the FUNCTION
with front panel controls SYNC DELAY SEC, 2R41, and
switch
in
its
INT
or
EXT
position and the
LOW-X1-X10-X100 multiplier switch, 2S4, 2IC1 has two
RATE X1-X10-X100 switch set at its X100 position the
outputs; one output is applied to the undelayed sync amp
basic repetition rate is determined by RC components
for amplitude and impedance conditioning prior to
2R4, 2R5, 2R6, and 2C3 and will be in the range of 2,000