Precision Timer By RdioShck - LM555, 8-Pin DIP Kuwit | Ubuy

These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of 5 V to 15 V. Timing from Microseconds to Hours Adjustable Duty Cycle Output circuit is capable of sinking or sourcing current up to 200 mA