Free Simple Circuit Diagram
Balance indicator for power supply show if a symmetric power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we can make a such indicator. One pair drives the red warn LED3 and the other pair drive the yellow negative(-) and positive (+). The power supply of this circuit is an unregulated voltage. The […]
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Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to 50 kHz. Its very easy and quick to make this circuit. This circuit uses NE555 IC timer to drive a speaker. SPKR1 can be piezzo tweeter, etc. If you use a moving coil tweeter, then it […]
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This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high frequency modulated infrared light. By filtering out un-modulated or low frequency modulated signal, this circuit will be able to remove any interference from ambient infrared light coming from other sources such as sun light, soldering […]
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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 isolation, a Burr-Brown BB3656 isolation amplifier integrated circuit (IC) is used in this circuit. With internal transformer inside, this integrated […]
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