AM radio rf amplifier


Posted on Feb 6, 2014

a typical rf amplifier that is used in an AM radio receiver. In figure 2-19, the input circuit is the antenna of the radio (L1-a coil) which forms part of an LC circuit which is tuned to the desired station by variable capacitor C1. L1 is wound on the same core as L2, which couples the input signal through C2 to the transistor (Q1). R1 is used to provide proper bias to Q1 from the base power supply (VBB). R2 provides proper bias to the emitter of Q1, and C3 is used to bypass R2.


AM radio rf amplifier
Click here to download the full size of the above Circuit.

The primary of T1 and capacitor C4 form a parallel LC circuit which acts as the load for Q1. This LC circuit is tuned by C4, which is ganged to C1 allowing the antenna and the LC circuit to be tuned together. The primary of T1 is center-tapped to provide proper impedance matching with Q1.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Microfarad Counter
The Star-Delta 3-phase Motor Starting Method
Detection systems in PET
Interfacing The Msp430 And Tmp100 I2c Temperature Sensor
Transistor Circuit Analysis
Sound Level Indicator
Low Noise Microphone Preamplifier Circuit
Maximum Minimum Voltage Indicator
DIY Intercom Design Thread 4
1000W AC power supply automatic voltage regulator circuit
Four flashing lights string circuit 6
Another type of level controller internal circuitry JYB
Reflected light intensity detecting circuit CD4052B CD4011B
The brake a little dynamic braking circuit



Top