Free electronic circuit design and schematic diagram
A PLL system can be used to implement an FM demodulator. When a PLL is locked on an FM signal, the VCO tracks the instantaneous frequency of that signal. Since the VCO output tracks the FM signal, and the VCO input voltage is proportional to the VCO output frequency, then the VCO input will be equal to the demodulated signal. […]
Read moreThe circuit below is a schematic diagram of a fast pulse detector. At 100 ns or wider pulse width, the detection should be error free. At 60 ns pulse width, the detection error should be under 10%. This circuit should be used to detect at least 100 ns wide pulse to ensure an error free performance. [Circuit’s schematic diagram source: […]
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A fast peak detector similar but faster than previous peak detector, can be implemented using open loop configuration. Here is the schematic diagram of the circuit: In this design, D1 is the detector diode and D2 is a level shifting or compensating diode. A load resistor RL is connected to – 5V and an identical bias resistor, RB, is used […]
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Fading a video signal is not as simple as attenuating the whole signal, since there will be a point where the sync amplitude becomes too small.
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Op-amps has been widely used in low frequency oscillator (frequency <= 100kHz), but we can actually use it for high frequency crystal oscillator as long as we have an op-amp with the proper bandwidth. An excellent gain stages can be implemented using LT1190 and LT1191 op-amps. Here is the schematic diagram of the circuit: Two Schottky diodes is employed to […]
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LT1206 has been naturally selected as the components for video application since it has suitable bandwidth and output derive capability. This high performance features is not only suitable for video application, but also make it definitely suitable for audio application. The schematic diagram shows the LT1206 combined with the LT1115 low distortion, very low noise audio buffer with a gain […]
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Computer-controlled 4-20mA current loop is useful to control some industrial equipments. By current loop, transmitting the signal over long distant should be resistant from noise interference. This computer-controlled 4 – 20mA is designed to operate on a single supply over a range of 3.3V to 30V. The zero reference of 4 mA is set by R1 and calibrated using R2. […]
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