Free electronic circuit design and schematic diagram
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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When we connect a mono audio output into a stereo headphone (simply by paralleling it), we would hear the sound with all of its components comes from one point, and the worst, that point is located inside your head. This perception is created by the fact that the signals from the right and left earphones have exactly the same amplitude […]
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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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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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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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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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Some single supply op-amp circuit might be used in some application, but it rarely has perfect linearity near the zero level since it has very low drive in the feedback path, so negative supply could be the only solution sometimes. Negative supply from positive supply is needed if the circuit need both positive and negative supply while we have only […]
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