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Encyclopedia > Astable

An astable multivibrator is an electronic circuit that has two states, neither one of which is stable. The circuit therefore behaves as an oscillator. The time spent in each state is usually controlled by the charging (or discharging) of a capacitor through a resistor. There are several types of astables, and they can be made in many different ways. Some are made from NOR gates while others are made from dedicated timer chips. A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. ... An electrical network or electrical circuit is an interconnection of analog electrical elements such as resistors, inductors, capacitors, diodes, switches and transistors. ... Oscillation is the periodic variation, typically in time, of some measure as seen, for example, in a swinging pendulum. ... A capacitor is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. ... Resistor symbols A pack of resistors A resistor is a two-terminal electrical or electronic component that resists the flow of current, producing a voltage drop between its terminals in accordance with Ohms law. ... This article is about logical nor Nór. ...

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 555 Timer/Oscillator Tutorial (8062 words) In both the monostable and astable time modes, this transistor switch is used to clamp the appropriate nodes of the timing network to ground. The astable multivibrator generates a continuous stream of rectangular off-on pulses that switch between two voltage levels. The astable circuit is an oscillator whose frequency is dependent upon the R1, R2, and C values.
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