Free electronic circuit design and schematic diagram
Below is two single ended circuits which connected back to back give differential input. This circuit is not only has differential input feature, but also high impedance, much higher compared with the analog ammeter without this circuit. Here is the schematic diagram of the circuit: [Circuit’s schematic diagram source: seekic.com]
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Normally, frequency multiplier or divider has only discrete ratio operation since it uses digital divider as the main process for division or multiplication. By first converting the incoming frequency into a proportional DC voltage, we can perform frequency scaling easily with no restriction of discrete ratio operation. Here is the block diagram the scheme: We can accomplished it by using […]
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Featuring very low power consumption, 675 nA is the total current consumption for this amplifier circuit. The output voltage swing is 300 mVpp with a 20 kΩ load. This very low power design is made possible by high gain low power operational amplifier CA3078. CA3037 is marked as obsolete product by Intersil, but they suggest ICL7611, ICL7612, CA5420A, CA3140, or CA3160 for […]
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The reason why TC9400 V/F converter is very useful in the laboratory are because it’s portable, battery-operated, and low cost frequency source. Both pulse and square-wave outputs are provided by the TC9400. A triangular waveform can also be generated by adding an op-amp integrator. The outputs can be frequency-modulated via the FM input. [Circuit’s schematic diagram source: Microchip Application Note]
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We can construct a tachometer using the TC9400 in the F/V mode to convert the frequency information (RPM) into a linearly proportional voltage. Then we can compare this voltage to one of “n” comparators (on this example using 8). The respective LED lights up and will continue to stay lit as long as the voltage exceeds the trip point when […]
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Designing various electronic circuit system (synthesizer, modem, decoder, data converter, etc) of ten need a frequency modulator subsystem. An FM modulator is very easy to build with TC9400 since the it has very good linearity as V/F converter. Here is the system’s block diagram: While Vin determines the amount of modulation (FM deviation) around the center frequency, the potentiometer determines […]
Read moreBelow is video tutorial about electric cooling fan circuit. This circuit is consist of a fan motor, engine control module, ECT sensor, and an A/C fan control module. ECT sensor is used to sense the condition of the engine. If the engine getting hot, ECT sensor will give a signal to the engine control module to turn on the fan […]
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