Fast Charger for Better Lead-Acid Battery Life

Compromising between the speed while maintaining safe operation for battery charging is an interesting challenge. This circuit can be used to charge a battery , and it’s safe and  rapid.  To get quickly charged, this circuit charge with initial charging voltage of 2.5V per cell.  To keep it safe, this circuit prevent the battery from overcharging by lowering the voltage […]

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LT1016 – LS74121 Voltage Controlled Pulse Width Generator/ Monostable Multivibrator

Mono-stable multivibrator circuit generates 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. In today’s digital electronics, mono-stable function can be easily implemented […]

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Missing Pulse Detector Circuit with 555 IC

An absence of pulses could mean an important things, depending on your system, it might be a grip loss when your vehicle’s wheel is locked during braking and anti-lock action should be taken immediately,  a loss of image integrity and your monitor should be blanked while trying to regain the synchronization signal, or it could be any other important things […]

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Loud 10-W Car Alarm Siren

This alarm generates square-wave output that sweeps down and up in frequency, producing force field of high-intensity sound inside car, building, or your other properties. In security application for example, 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 […]

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Telephone Circuit: Music On Hold

Some costly efforts have been made to shorten the waiting time for all kind of services in the call center or other business, but many customers still complaining about the long waiting time, so other solution should be taken to handle this situation. Waiting a call hold can be boring if there is only silence on the line, that’s the […]

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