Tag Archives: flip-flop

RS Flip-Flop Using OP-AMP

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This RS flip-flop is op-amp version of classic flip-flop which uses two inverting amplifier. The non-iverting input is floating, and we can assume that the voltage level of this floating pin is between VCC and ground, while the outputs will always be high or low. The high level of the… Read more »

Non Retrigerable Monostable Multivibrator Using Transistors

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The monostable flip flop is a electronic circuits that is used to produce a single pulse each time it is triggered. Sometimes, this circuit called a ‘one shoot’. This circuit is very useful, for example it can used to produce a delay for timing applications or debounce a mechanical switch… Read more »

Single Transistor Blocking Monostable

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Below is  a schematic diagram of blocking monostable circuit. The normal state of the transistor is off because the 10 k resistor has been removed. The conduction will be started using a positive pulse at node “a” and the transformer will do the rest. The transistor will again be turned… Read more »

20 kHz Astable Multivibrator with Transistors

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Astable multivibrator or oscillator circuit is based on positive feedback. We can design such circuit using op-amp, logic gates, or transistors. Here we can rely on single capacitor capacitor and resistor for the feedback inside op-amp like transistor circuit, which works over wide range of temperature, voltages and transistor gains…. Read more »

Discrete 0.5-300 ms Monostable Multivibrator

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Monostable multivibrator circuit produce a fixed pulse-width when the input is triggered.  The input is fed to CR1, which should be an open collector source since the TR1 would short the input to ground during the active state  appear on this circuit’s output.  The output of this circuit is tapped… Read more »

Retriggerable One Shot with 556 IC

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Retriggerable one shot/monostable multivibrator circuit is a flip-flop circuit which give active output when an input is present, and hold the state for a predetermined period before turns to inactive state. The difference between retriggerable and non-retriggerable  is that retriggerable circuit gives period extension when the input is retriggered before… Read more »

Versatile Discrete Monostable Multivibrator

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This is a versatile discrete monostable circuit. This circuit consist of 2N3819 JFET and 2N3704 transistors. This monostable multivibrator circuit  has additional input to enable or inhibit the function at any time without causing output pulse. The input of this circuit accept a standard digital IC voltage levels. Here is… Read more »

Touch Switch Monostable/Timer with 555 IC

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A schematic diagram of a touch switch circuit is shown below. This circuit consist of timer, one shoot multivibrator and touch terminal. As timer, this circuit uses 555 timer which is connected to one-shot multivibrator. The touch terminal is used to trigger this circuit. The output of this  circuit can… Read more »

Direct Coupled Discrete Astable Multivibrator

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This flip-flop circuit  is a free running/astable multivibrator one,  with bases and collector of both emitter biased transistor are directly coupled to each other.  Switching action is supported by means of capacitor in each emitter circuit.  This configuration produce a triangle waves at emitters. Since neither transistor can remain permanently… Read more »

LT1016 – LS74121 Voltage Controlled Pulse Width Generator/ Monostable Multivibrator

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Monostable multivibrator poduces a fixed pulse width when receiving a trigger signal on its input. The pulse width of the output is fixed regardless of the input pulse duration/width. In practical application, the width of the output pulse is determined by choosing the right components values for certain application. With… Read more »