Free electronic circuit design and schematic diagram
Using LM134 and LM10 integrated circuits, we can build a thermometer which has -55 to 150°C sensing range. The ideal meter for this circuit is a 0-200uA digital ampere meter, which can show both positive and negative polarity. This will make the circuit suitable for indicating temperatures below 0°C. LM134 is basically a current source with very accurate and consistent […]
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A battery level indicator circuit is depicted in the schematic diagram below. This circuit is designed for 9V battery operation, as this circuit will start dimming below 7V and will be completely turned off at 6V. If you want the LED indicator not to dimming but just abruptly turns off at below 6V, then you can remove R3, and change […]
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Using LM10 amplifier and voltage reference, a light intensity meter featured with five decades dynamic range (which is suitable for photographic application) can be built. Please note that the linear to log conversion is not temperature compensated, and can make 40% error (a half stop in photography) at the worst point of conversion slope at ±18°C temperature drift. It should […]
Read moreThis video tutorial is about the hall effect WSS sensor. This video describes about how the hall effect sensor work. The wheel speed sensor uses the WSS family. Hall effect sensor are three wire sensors with the reference voltage, ground and the signal terminal. The reference voltage can be 5V,7V,8V or 12V. The reference voltage is supplied by the ABS […]
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Clipping is a condition where a signal is truncated by insufficient processing. The cause of clipping can be different for various case, but most of them, especially in power amplifier stage, is because the amplifier is forced to serve out-range of power when the input volume is too high. Detecting severely clipped signal is easy by listening, but a soft […]
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This is a audio-controlled lamp circuit. This circuit requires low voltage input such as pre-amplifiers, tone control, or general audio line level output. It’s also possible to feed the input with signal from small power amplifier output, or high power amplifier witk low volume level. The characteristic of lamp dimming (incandescent lamp) will look like coming from proportional controller since […]
Read moreThis is a EGR valve temperature sensor video. This video describe how the EGR valve temperature sensor works. The EGR gasses temperature sensor works like the coolant temperature sensor. The sensor uses the thermistor that has negative temperature Coefficient. That means the resistance decreases with increasing temperature. Here is the tutorial video: The operation of the EGR temperature sensor is […]
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