Heart Monitor (ECG Sensor Signal Amplifier/Conditioner)

Posted on December 20, 2011 by Rend

Using the circuit depicted in the schematic diagram below we can monitor the heart pulses of patient. This circuit buffer and amplify the heart pulses, and the amplification bandwidth ranges from DC to 3 kHz. For the core of the … Continue reading →

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LM139 One-Shot Multivibrator

Posted on December 9, 2011 by Rend

The circuit below is a one-shot multivibrator. One shot multivibrator is also known as monostable multivibrator, or timer. The main function of such circuit is producing a fixed width pulse. The width of this pulse is determined by the component … Continue reading →

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Ears and Speakers Protector

Posted on December 2, 2011 by Rend

Sometimes the output volume of amplifier is too high and hurts our ears. As well as hurting your ears, this incident could damage your loudspeaker. The circuit below can be used to protect both our ears and our loudspeakers from … Continue reading →

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