Free electronic circuit design and schematic diagram
This is a infrared Remote Control Decoder circuit. This circuit uses the SAA3049A which is used to check and convert the received coded data (RECS80/RC5) into latched binary outputs. We can uses several device in one location because the device address can be hard-wired for a particular address. The output of this device are the received data and address. Here […]
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The photodiode can be used to detect IR reflected from the object. However, IR produced by the ambient conditions also detected by the photodiode. This IR noise must be filtered to prevent false detections. Usually, the LED’s IR signal is modulated with a convenient frequency and then using that modulation to detect only IR to filter the IR noise. So, […]
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Ni Cad batteries can be charged at high current rates because it allows short charge time. But, it has difficulty in operations such as excessive internal heating degrades the batteries and can cause gas venting to the outside atmosphere. Because cell voltage is not necessarily indicative of the charge state of the battery , schemes based on monitoring cell voltage […]
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The best choice for stability and high accuracy in temperature measurements is Platinum resistance temperature detectors (RTD). However, the signal conditioning is complicated by the RTD which exhibit a non-linear temperature versus resistance characteristic. The non-linearity amount of 0 C to 100 C is up to 0.4 C. Here is the schematic diagram of linearized platinum RTD signal conditioner : […]
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Four phase drive signals for two phase bipolar and four phase unipolar step motors in microcomputer-controlled application is easily implemented using L29 Stepper Motor Controller IC. We can drive the motor in half step, normal and wave drives mode and switch-mode control of the current in the windings is permuted on chip PWM chopper circuits. This device has some features […]
Read moreThis video shows how to having fun using the relay. This video talks about how to make buzzer using relay. The pin configuration of the relay is shown in this video. In this video, the relay that is used is standard 24V relay. When the power is applied on the relay, the relay will buzz. The frequency of the relay […]
Read moreThis is a relay and contactors basics video tutorial. This video shows how relay and contactors work. The relay is an electromechanical switch it works an electromagnet. There are three electrical connection on relay, they are common, normally close and normally open. There is a small contactor inside relay. Besides that, inside relay there is a coil. The coil can […]
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