Monthly Archives: November 2009

Op-Amp Colpitts Oscillator

Posted on November 16, 2009 by Adam
high-frequency-colpitts-oscillator

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 … Continue reading →

Posted in Oscillators, RF and Video | Tagged | Comments Off

Video Fader Circuit

Posted on November 16, 2009 by Adam
video-fader-circuit

Fading a video signal can’t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a circuit to overcome the problem: Most of video signals will works with this circuit, except for … Continue reading →

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Open Loop Fast Peak Detector

Posted on November 16, 2009 by Adam
fast-peak-detection-open-loop

In this peak detector circuit, 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 to bias the compensating … Continue reading →

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