Free Simple Circuit Diagram
This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 timer is used as astable oscillator in this circuit. When this circuit is under dry conditions the transistor will be fully off because it have no bias current. when the probes get wet, a small […]
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This schematic diagram shows a water level sensor/detector/monitor circuit. An alarm is also featured in this circuit. Any fluid with a resistance under 900K between the maximum separation distance of the probes will trigger this circuit. A 4050B CMOS hex buffer is used on this circuit that is working at 5 volt supply. The 10M resistors connected between buffer input […]
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When the volume control is turned down, sometimes it causes the sound to be “dulled”. The series resistance of the pot interacting with the capacitance of the next stage to form a low pass filter and a resulting high frequency loss causing the dull volume control. To prevent this, a small capacitor can be added from the input to the […]
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This is a simple Low-Pass and High-Pass RC Filter Frequency Calculator. This calculator is used to calculate the corner frequency of low pass and high pass filter. To change from low pass to high pass, just switch the position of the resistor and capacitor. The corner frequency does not change because the calculator assumes a low source impedance. Here is […]
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