Broadcast Band Rf Amplifier Circuit

Posted on May 13, 2012

The circuit has a frequency response that ranges from 100 Hz to 3 MHz; the gain is about 30 dB. Field-effect transistor Ql is configured in the common-source self-biased mode; optional resistor R1 allows you to set the input impedance to any desired value. Commonly, it will be 50 . The signal is then direct-coupled to Q2, a common-base circuit that isolates the input and output stages and provides the amplifier`s exceptional stability. Last, Q3 functions as an emitter-follower, to provide low output impedance (about 50 ).

Broadcast Band Rf Amplifier Circuit
Click here to download the full size of the above Circuit.

If you need higher output impedance, include resistor R8. It will affect impedance according to this formula: Rs ~ ^0lJT - 50. Otherwise, connect output capacitor C4 directly to the emitter of Q3.

Leave Comment

characters left:

New Circuits



Popular Circuits

DC to AC inverter
Battery Watchdog Circuit
Inrush Current Limiter Circuit
Adjustable Regulated Battery Charger circuit diagram
Simple High Quality Preamp For Hi-Fi
12v power supply circuit
Automatic Muting Circuit For Audio Systems PCB
Hot-air Rework Station
200 Watt High Quality Audio Amplifier
Integrated static switch circuit diagram of the flip-flop TDA1024
12V DC power supply circuit
Birds singing analog signal generator circuit