Radio Frequency - Circuits - Electronic Blog for hobbyist

Here are two simple Junk Box but extremely useful circuits. They are designed to amplify those flimsy 2.4 GHz Pinhole cameras with such annoyingly low power and short range.

The two transistor version [A ... Read more »

Category: Radio Frequency | Views: 2259

Simple Cell Phone Jammer

A "Cell Jammer” is just way of saying "Dirty Transmitter” which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better. ... Read more »

Category: Radio Frequency | Views: 2296

Simple No-Tune Wi-Fi Sniffer

Here is a circuit of a very basic No-Tune Wi-Fi Sniffer. It’s about as simple as it gets, using only two transistors. It could detect my notebook at 10 feet with a tiny vertical. No doubt, a Well Tuned Dipole would increase it’s range. ... Read more »

Category: Radio Frequency | Views: 2832

500 mW VHF Video Transmitter

Q1 (BC548C) is a modulated oscillator operating in the Commercial VHF Television Band and Q2 (BC548C or 2N4427) is an VHF RF Amplifier. ... Read more »

Category: Radio Frequency | Views: 2708

1.5 Watt 1-2 km Range FM Transmitter

Here is a well designed FM transmitter circuit that works effectively in 1 - 2 km range.

Input source is an electret condenser microphone and signal gain can be adjusted by using the potentiometer P1. You can easily prepare the PCB by using any PCB editor and apply it to the board by using the ironing method. The coils and the antenna can be designed as a part of the PCB made up of the copper area. ... Read more »

Category: Radio Frequency | Views: 2648

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