PURPOSE: To reduce the cost of monostable multivibrator which is used in a ghost eliminating circuit without deteriorating the function of the vibrator, by using a constant current to discharge a capacitor of a constant circuit.
CONSTITUTION: The emitter of a discharging transistor TR102 is grounded via a resistor 123. As a result, it is eliminated that a large discharge current flows via the TR102 even at a time point when the TR102 is turned on. Thus the both- end voltage of a capacitor 103 drops gradually less than the base voltage S4 of a TR109. As a result, the TRs 104 and 109 are turned off and on respectively. The pulse width is varied for the masking pulse Pm given from an output terminal 117, and the rise of the pulse receives no effect. Thus the capacity can be reduced for the TR102.
KURIKI CHIYOUEI
SAITOU JIYUNYA
