Today, we introduce simple & small High Power FM/UHF/VHF booster (TV signal amplifier) circuit. It covers the frequencies from 40MHz to 900MHz and boosts the VHF signals up to 23dB and UHF signal up to 18dB. An External power supply not necessary for this circuit, it operates using the coaxial cable as feed line. It’s very easy to build, but try to maintain the terminals of component as close as possible to discharge involved frequencies. Make this circuit on good quality PCB for best performance.
Frequency response – 40MHz – 900MHz
Typical Gain – 18dB
Maximum output level – 90μV
Impedance – 75Ω
Typical Gain – 18dB
Maximum output level – 90μV
Impedance – 75Ω
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Components:
D1, D2 – IN4148
D3, D4, D5, D6- IN4007 C1, C4 – 100PF (101) Ceramic C2 – 2.2PF Ceramic C3 – 1000PF (102) Ceramic C5 – 470μf / 16V Electrolytic C6 – 1000μf / 16V Electrolytic C7 – 0.24μf (224) Ceramic R1 – 82K/0.25W R2 – 1.5K/0.25W R3 – 270Ω/0.25W R4 - 120Ω/0.25W Q1 – 2SC3355 T1 – 230V – 12V/300mA step-down transformer
L1, L2 – Wire thickness – 0.5mm (25 SWG / 24 AWG)
Diameter – 5mm
Turns - 8
L3, L4 – Wire thickness - 0.5mm (25 SWG / 24 AWG)
Diameter – 3mm
Turns - 25
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Feb 22, 2011
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