Two Stage FM Transmitter

After a two months we are back with a Simple and Working FM Transmitter Circuitry.This a two stage FM Transmitter which is in work fine and you can use it to transmit your signal over a long distance,Its work within 100 meters to 2-3KM.Frequency Range is 87.5MHz to 108MHz.For transmitting over a 2-3KM,its require a minimum 75cm antenna height.Increasing a antenna height will always give us a better range but 2-3KM Transmission is sufficient for smaller projects and increasing height will cause a circuit unstable so please keep your antenna height in between a 75cm-100cm.

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Filed Under: hobby project, Radio

VHF Field Strength Meter

Above Circuit Show wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1.Even a very small DC voltage is sufficient to alter the biasing of FET and it will be reflected in the meter as an indication of the presence of a radio signal. The meter can be calibrated by adjusting the preset R2 to make meter M1 read ZERO in the absence of any radio signal. This circuit is not very sensitive, but can sense radio signals from hand held FM transmitters up to a distance of few meters( ideal for theoretical demonstrations).

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Filed Under: Detector

Quite Universal Circuit Simulator

Qucs[Quite Universal Circuit Simulator] is free circuit simulator with graphical user interface and power full features.Qucs support all kind of circuit simulation types,like DC, AC, S-parameter, Transient, Noise and Harmonic Balance analysis. Pure digital simulations are also supported.
Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behavior of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window.

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Filed Under: Elex-Soft

Logisim-Logic Circuits Simulator

Logisim is a simple but powerful software for making or simulating digital logic circuits.With its simple toolbar interface and simulation of circuits as you build them, it is simple enough to facilitate learning the most basic concepts related to logic circuits. With the capacity to build larger circuits from smaller sub circuits, and to draw bundles of wires with a single mouse drag, Logisim can be used (and is used) to design and simulate entire CPUs for educational purposes.

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Filed Under: Elex-Soft