All commercial FM Band which is in between(87.5MHz to 108MHz) simultaneously blocked by this Wideband FM Jammer.

How Its Work Or Operation Principle:

Sawtooth and white-noise signal generator:
This wideband jammer simultaneously blocks all transmissions within a desired band typically by "sweeping" across the desired band to be blocked, starting at the lowest frequency and ending at the highest frequency of the band. For this purpose a linear sawtooth signal is applied to the modulator in the FM transmitter described here. The transmitter uses varactor diodes in the tuning circuit to determine the transmitters frequency of operation.

Cathleen Shamieh, Gordon McComb, "Electronics For Dummies, 2 edition"For Dummies | ISBN 0470286970 | 2010 | PDF | 349 pages | 8,3 MB
Electronics is fascinating – want to make something of it? This book shows you how!
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Reach beyond the limits of your own eyes, ears, nose, and sense of touch with these 54 exciting projects that enlist the uncanny talents of electronic sensors to probe dimensions beyond mere human powers of perception. With the help of popular electronics author Tom Petruzzellis, you can build your own fantastic projects that measure, touch, and explore the limits of the known natural world -- and the leading edges of the future of science and robotics! All 54 projects are fun, easy, and inexpensive to make at home and -- best of all -- seriously exciting and impressive!

PowerEsim- Free on-line switch mode power supply SMPS, circuit and transformer design, calculation, simulation software. More than 100 circuits and topologies are available with real constructed transformer.
It provides a virtual laboratory environment for users to wind and place every single turn of a transformer, and with the help of tens of thousands real modeled component on the market, user can simple pick and place the real component and stuff into the circuit, within a fraction of a second, our server will immediately return the result to the user.

SweepGen turns a PC into an Audio Oscillator and Sweep Generator which can be used for testing audio or educational purposes. In conjunction with audio test instruments, you can make frequency response plots. SweepGen uses the sound card in your PC to produce sine waves that are mathematically correct almost to CD quality, indeed it's more likely that the quality of your PC sound card will be the limiting factor rather than the code in SweepGen.