Wide band high frequency amplifier

This is Wide band high frequency amplifier circuit, a 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.

The 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
C1, C3: 0.0056uF 50V
C2: 56pF 50V
C4: 5.6pF 50V
Q1: BF324___PNP Transistors

Or BF199 (Buy Here)

L1: is 10 turns of 24 SWG enamel coated magnet wire wound with an inside diameter of about 3mm. no core.
L2: is 13 turns of 24 SWG enamel coated magnet wire wound with an inside diameter of about 5 mm. no core.
The Universal PCB board


Figure 2 the component layouts of this circuit

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  1. Ian

    The BF324 transistor has a transition frequency of 450MHz, which is not much higher than common transistors like the 2N3906 (pnp) or 2N3904 (npn). This is one reason why the common-base configuration is used here. A npn transistor like the BF199 might be a better bet, but the polarity of the supply would need to be reversed. As both supply lines are at ground potential as far as signal voltages are concerned, the output could still be referenced to the negative rail.

    • Thank you very much for your good advice. Your experience is very valuable. Hope to return to visit our website again.

  2. yousef

    Could you put L3 as opposed to L2 as output instead of output

  3. Jordan Dobrikin


    Do you have a simple small signal RF Aplifiers that can be used in retrofitting Antique 1920s TRF Radios to operate at lower safer PlateB+ voltages. 
    Also for building Steampunk TRF Radios Atwater Kent Model 10 Breadboard style 
    STEAMPUNK Radios two Messages   
    Do you have Designs/Schematics for simple low-cost RF Amplifiers Hollow State low safe Plate Voltages and Solid State Transistors/Semiconductors?
    To be used in retrofitting Antique 1929s TRF Radios as well as building Steampunk Radios Breadboard style, Antique Tuning Components and Modern Electronics ( Variometer, Variocoupler, Variable Condenser/Coil  
    73 de jordan ve7jjd [email protected]
    STEAMPUNK/Retro Modern/Hybrid Radios (Grammarly)
    Looking for comment; advice; assistance; for my Senior Citizens SWL/Scanner/DXing Club’ STEAMPUNK/Retro Modern/Hybrid Radio Receiver/Objet d’art/Plural Objets d’art Project(s)  
    A) To Retrofit/Restore, Antique/Vintage TRF & Regenerative Receivers to use low, safe, Plate voltages. 
    B) To Build, Breadboard style, Crystal, TRF, and Regenerative Radios using Antique/Vintage Tuning Components with modern electronics to come up with Objets d’art Sculptures; as well as Functional Radios.  
    Steampunk combining Antique Components with Modern Electronics. The basic idea is to give the user the “feel ” of 1920s multiple Tuning Controls with modern stable electronics.  
    The need for assistance is coming up with simple basic RF Amplifier schematics.
    Tubes and/or Transistors, especially circuit designs using 12 volt Space Charge Tubes. 
    Plan A: All solid State
    Plan B: All Hollow State
    Plan C: Hybrid is Hollow State RF with Solid State Detectors and Audio Amplifiers.
    For, Antique/Vintage Radios, the plan is to remove all high voltage Tubes and use the Hardware Chassis Tuning Components and wiring and use RF & Audio Modules/PC Boards; Hollow State, and/or Solid State; mounted on dead tube bases. Minimal disruption to original circuitry so as to be able to reverse changes to allow a conventional restoration. The hybrid comes in with Hollow State for the RF Stages and Solid State Transistor/semiconductor PC board/modules for Detector and Audio; readily available on eBay.
    The need for assistance is coming up with simple basic RF Amplifier schematics to build PC Board/Modules Tubes and/or Transistors as well as circuit designs using low plate voltage Tubes. 
    thanx 73 de jordan ve7jjd  [email protected]  

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