Free Simple Circuit Diagram
There are many applications that require stability in the operation, such as telecommunications, servos, and test equipment. They are using frequency-accurate sine-wave sources, but to find frequency-accurate sine-wave sources with satisfactory level of absolute accuracy and drift can be a problem, even if there are many such sine-wave oscillators are available. To get less drift and greater accuracy ws can […]
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To generate a system clock or auxiliary sleep clock in microcontrollers (µCs) and low-power instruments we usually use A 32kHz oscillator. A CMOS inverter (74HC04 or CD4049UB type) biased as a linear amplifier by connecting a large-valued resistor from the input to the output is one of usual implementation. The inverter circuits give us problems. To attain Supply currents fluctuate […]
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A frequency-selective frequency multiplier can be construct with a PLL system by inserting frequency divider inside the feedback between the phase detector input and the VCO output. Figure below shows the schematic diagram of low-frequency synthesizer with a programmable three decades divider circuit. The frequency-divider modulus N have value between 3 to 999 with single steps increment. In locked condition, […]
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Colpitts oscillator can be implemented using op-amp as long as we have an op-amp with proper bandwidth. Here is an example of such circuit: LT1190 or LT1191 op-amps is used to serve as an excellent gain stages. Limiting the gain is done by two Schottky diodes, that maintain the signal at approximately +11dBm. This circuit give a low distortion performance, […]
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