DC Voltage Regulation - TM-5-6350-262-14-20030

processor/receiver ultrasonic passive signal operat-

frequency as the SYNC pulse frequency, the output

ing band (20 kHz to 30 kHz). Without the synchroniz-

at the drain terminal is a dc level and is completely

ing pulse from the processor/transceiver ultrasonic

rejected by high pass filter components C17-R26 and

motion signal and the band rejection filter in the

C21-R3. For all other frequencies received, the

processor a continuous alarm would be generated.

output will be the difference frequency. This techni-

The processor/transceiver ultrasonic motion signal

que permits complete attenuation of the

provides a synchronizing pulse for use when both

processor/transceiver ultrasonic motion signal au-

equipments are operating in the same environment.

tomatically without the need for adjustment. The

The SYNC pulse input to the processor is a 26.3 kHz

adjacent signal attentuation is negligible. In effect, it

triangular waveform with a peak to peak voltage of

is an automatic tracking notch rejection filter.

2.3 volts. This waveform is regenerated by sync pulse

Unwanted high frequency components are rejected

regenerator Q4 which has a square wave output

by an active low pass filter consisting of Q6 and Q7

pulse of approximately 5 microseconds at 10.5 volts

which in turn drives amplifier Q8 and Q9. The

remainder of the functional description is the same

and a period of 38 microseconds. With the appro-

as described above.

priate connections performed at TB 3 for incorporation of

the band rejection filter between broadband amplifier Q3

6-4. DC Voltage Regulation

and amplifier Q8 and Q9, the circuit operates as a notch

rejection filter.

Power for operating the processor and the receiv-

Mixer Q5 is gated at the precise frequency of the

ers is provided by the J-SIIDS control unit; +20 2

processor/transceiver ultrasonic motion signal.

Vdc, regulated. A block diagram of the power

Sounds

regulator is shown in figure FO-2, (located at rear of

received

(generated by

the

processor/transceiver ultrasonic motion signal) and

manual). Diode CR5 in the positive line of the input

amplified by broad-band amplifiers Q1, Q2, and Q3,

+20 Vdc is so oriented as to offer circuit protection

are applied to the source (S) terminal of mixer Q5.

against accidently reversing the input power polar-

The mixer output at the drain (D) terminal is the

ity connection to the processor. Voltage regulator Z1

difference frequency (in the audio range) between

regulates the input dc power at an output of + 12 Vdc

that at the gate and that at the source. When a

which is used throughout the processor/receiver

received signal, by the receiver, is at the precise

ultrasonic passive signal.

6-4