Free electronic circuit design and schematic diagram
Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator). This is a PC Signal generator produce a square wave in audible frequency range. This circuit utilize a transmission of a “U” character from ASCII character set. This character has binary value of 01010101, making it […]
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Sferic signal simulator is used to produce an impulse signal which simulates the waveform of a sferic, a radio atmospheric signals produced by a lightning strike. In time domain, the waveform of a sferic signal is a single high amplitude spike. When this pulse is analyzed in frequency domain, it will show a wide band spectrum ranging from few kilohertz […]
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Monostable multivibrator circuit produce a fixed pulse-width when the input is triggered. The input is fed to CR1, which should be an open collector source since the TR1 would short the input to ground during the active state appear on this circuit’s output. The output of this circuit is tapped from the collector of TR2. This monostable multivibrator output pulse […]
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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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The Vc1 increases linearly when the pull-up resistor RA in the monostable circuit is replaced with constant current source, generating a linear ramp. The linear ramp generating circuit and the generated linear ramp waveforms illustration is shown in figures below. Current source is created by PNP transistor Q1 and resistor R1, R2, and Re. Ic= (Vcc-Ve)/Re Ve= Vbe + (R2/(R1+R2))Vcc […]
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This is a Programmable Levels High Speed Pulse Generator circuit. This circuit consist of Lilliputian dimensions associated with the sub-micron geometries of many analog and most digital processes also advanced CMOS logic gates or analog comparators. Here is the circuit : The advanced CMOS logic gates or analog comparators is used to create faster digital edges. The sub-micron of digital […]
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