Free Simple Circuit Diagram
A schematic diagram of a micropower single-supply instrumentation amplifier circuit is shown below. This circuit only need 15µA of current and can give over 110dB of common rejection. A single amplifier can provide differential to single-ended conversion with excellent common mode-rejection because feedback is to trim pins rather than to the inverting pin. Here is the schematic diagram of the […]
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This is Single-Supply Current Monitor circuit. Amplifying the voltage drop across a resistor placed in a series with the current to be measured is the essential of current monitoring. However it is difficult because with low precision op amps this greatly limits the overall resolution and only small voltage drops can be tolerated. Here is the schematic diagram of Single-Supply […]
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This is infrared (IR) proximity detector circuit. A matched infrared emitter and detector pair is used in this circuit. The voltage controlled oscillator section of the LM567 tone detector IC is used to set the emitter LED pulses at frequency. In this circuit, the center frequency of the VCO is set to about 909 Hz by combination of capacitor C1 […]
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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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