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Radioshack timer ic 555CN milliseconds through hours
Your source for precision timers.
Precision monolithic timing circuits capable of producing accurate time delays or oscillation. In the time-delay or monostable 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 may be independently controlled with two external resistors and a single external capacitor. The threshold and trigger levels are normally two-thirds and one-third; respectively; of VCC. These levels can be altered by use of the control voltage terminal. When the voltage input falls below the trigger level; the flip-flop is set and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level; the flip-flop is reset and the output is low. RESET can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low; the flip-flop is reset and the output goes low. Whenever the output is low; a low-impedance path is provided between DISCH and ground.
* LM555 precision timer - 8 pin dip