LT1016 – LS74121 Voltage Controlled Pulse Width Generator/ Monostable Multivibrator
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 this circuit schematic diagram, we …[Read More]
Missing Pulse Detector Circuit with 555 IC
Missing pulse detector will receive a source of repetitive pulse in normal condition. The output of this detector circuit will be inactive for normal condition (output pin 3 of 555 IC will be high, turning off the LED indication). If now the input pulse is missing, delayed, or stopped, then the output of this detector …[Read More]
By generating square-wave output that sweeps down and up in frequency, this circuit can produce force field of high-intensity sound inside car. This circuit can make a car thieve panics and decide to run before anyone catch his action. D1, C1 and R1 produce triangle waveform by shaping a square wave output of IC1. If …[Read More]
Telephone Circuit: Music On Hold
Waiting a call hold can be boring if there is only silence on the line. It’s a good thing to present an “easy music” in call hold, make a long waiting time feels much shorter. This simple circuit (consists of diodes, SCR, and some passive components) allows to place the caller on hold in one …[Read More]
TLC497CN Negative Supply Generator
Negative supply from positive supply is needed if the circuit need both positive and negative supply while we have only positive supply. The circuit shown in the schematic diagram below is a negative supply generator, built using a TLC497CN integrated circuit. The TLC497CN is used as the main switching circuit, and it can provide negative …[Read More]
Three Cells Produce Regulated 3V – 3.3V
Three NiCad and NiMH batteries can be used to produce 3V/3.3V supply voltage. This can be done by this linear regulator circuit. This circuit uses an ICL7611 micropower op amp and MAX872 voltage reference. This regulator can be used to replace the charge pump or a switching regulator. The dropout characteristics of this circuit depends …[Read More]
Simple Continuity Tester with Classic Flip-Flop Circuit
The schematic diagram below describes a simple continuity tester circuit. This circuit is used to test if two point is electrically connected by sounding a tone, which the pitch is inversely proportional to the resistance of the tested points. This circuit is designed for high resistance circuit, but however, this circuit can be used for …[Read More]
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