Category Archives: RF and Video

Small Broadcast-Band AM Transmitter

Posted on June 14, 2011 by Rend

This AM radio circuit is a low power transmitter working on broadcast band. The simplicity is implemented using a single-transistor amplifier stage, and for the stability a crystal is used to excite the 670Hz oscillation. The output power of this … Continue reading →

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Voltage Controlled Oscillator for Commercial FM Band

Posted on February 28, 2011 by Rend

VCO (voltage controlled oscillator) is an electronic signal generator which produce a signal that has variable frequency depends on a voltage level at its control input. Many VCO circuits are based on ramp generator to produce a variable frequency output, … Continue reading →

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High Off Isolation Video Switch/Multiplexer

Posted on February 11, 2011 by Rend

Video switch is required to mux/multiplex several video sources, enable multiple camera to be displayed subsequently on a single monitor. This multiplexing could significantly reduce the cost and the space for the monitor. High off isolation means that the signal … Continue reading →

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