556 Dual Timer
NE556 timer contains two NE555 timers in a single package.
These devices provide two monolithic, independent timing circuits of the NE555, SA555, SE555 or SE555C type in each package. These circuits can be operated in the astable or monostable mode with external resistor-capacitor timing control. The basic timing provided by the RC time constant may be actively controlled by modulating the bias of the control voltage input.
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