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f-alpha.net » Electronics » Basic Circuits » Multivibrator » Go on... » Experiment 12 - Monoflop

Experiment 12 - The Monoflop from C-MOS 4098

With the circuit shown, you build the monoflop with the C-MOS 4098, which contains two monostable multivibrators.

Circuit of a rising-edge-triggering monoflop. (Enlarge)

Circuit diagram of a rising-edge-triggering monoflop.

Once you press the pushbutton switch, the LED lights up and goes out after about half a second. This behavior corresponds to the transistor circuit of the Experiment 7.

The switching time T, in which the LED lights up, is determined by the capacitor C1 and resistor R2. In the data sheet of the C-MOS 4098 you find the formula...

T = R2C1 × 0.5

The Monoflop responds directly to the pushbutton switch. It is triggered by a rising edge, as you can see in the illustration to the right.

You can use the monoflop of the C-MOS 4098 also in a different way...

Signals of a rising-edge-triggering monoflop.

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