Wide band high frequency amplifier

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  Posted by momename - June 25, 2011 at 4:10 am

      High-frequency amplifier circuit,Wide frequency band between 75-150 MHz,Using transistors, a PNP amplifier.To enhance the signal strength.Before the receiver of the phone. Or FM radio or amateur radio.

      If high-frequency signals, in particular, its VHF. The booster circuit is one, serves to amplify the signal strength only.

      Operation of the circuit. High-frequency range VHF, inductive antenna, to the emitter pin of the transistor Q1. so circuit held, in conjunction with the bass, a nice low output impedance. You can use a special access code 50 ohms, the antenna on the circuit at all.Signal at the Q1 will be expanded to increase.And sent to a tuner or receiver to the receiver.

Wide band high frequency amplifier
Figure 1 The wideband high frequency amplifier circuit.

      The L1 coil wire enamel No. 24 SWG, thousands of rounds of 10, inside diameter 3 mm. And the coil L2 wire number. Thousands of 13 turns, diameter 5 mm. Stent both as a non-core, or an air core.
The power supply is +5 V, this circuit while current is 2.5 mA. If the components to use. Should be based on the antenna. And design of high frequency printed circuit boards as well.

How to assemble circuits
The assembling circuit onto the universal PCB board as Figure 2 May have problems, the interference inserted come in, If assembly circuit to actually use. Should have a basic antenna and PCB design in high frequency reasonable.
The components list
Resistors size ¼ W +5%
R1, R2__________18K
R3_____________1.5K
R4_____________220 ohm
Capacitors
C1, C3__________0.0056uF 50V
C2_____________56pF 50V
C4_____________5.6pF 50V
Semiconductor
Q1___________BF324___PNP Transistors
Others
L1___is 10 turns of 24 SWG enamel coated magnet wire wound with a inside diameter of about 3mm. no core.
L2____is 13 turns of 24 SWG enamel coated magnet wire wound with a inside diameter of about 5 mm. no core.
The Universal PCB board

components-layout-of-wide-band-high-frequency-amplifier
Figure 2 the component layouts of this circuit


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