Category Archives: RF and Video

Frequency Modulated Oscillator (for FM Transmitter)

Posted on January 2, 2012 by Rust

An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the oscillator will vary according to capacitance change.  The idea of this modulator is … Continue reading →

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

Voltage Controlled Gain Video Amplifier

Posted on September 15, 2011 by Rust

Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a potentiometer with anti glitch filter, or we can drive it with … Continue reading →

Posted in RF and Video | Tagged , | Comments Off

Low-Capacitance High-Impedance Video Buffer

Posted on August 9, 2011 by Rend

A video buffer circuit is characterized by its stable wide-band unity gain. Along with stable wide-band unity gain,  providing low capacitance and high input impedance will be enhance the circuit’s performance, and  the circuit depicted in the following schematic diagram … Continue reading →

Posted in RF and Video | Tagged | Comments Off