Theory has proved, frequency of the output noise power spectrum by the square of the frequency law of increase. However, many actual message signals, such as language, music, and their power spectrum decreases with increasing frequency, most of its e

In this paper, we show a kind of a small core BA1404 FM stereo transmitter, a lot of friends because he is very keen, and it asked me the information, so put put it up. In fact, on BA1404 used in many electronic magazines and newspapers more than a b

Here is a simple forwarding FM audio circuit that uses a AAA 1.5V battery can work continuously more than 3 months , firing distance of 10-20 meters.

Quarter wavelength in the amateur radio antenna in the most simple and effective should be regarded as no less an antenna in the radio sector, so it holds quite a lot in the proportion of for example, if you have the attention of police on the antenn

With the switching power supply technology continues to mature, further broadening the application field. Switching power supply and continuous power supply compared to the traditional series, the efficiency of electromagnetic pollution, size and rel

With the switching power supply technology continues to mature, further broadening the application field. Switching power supply and continuous power supply compared to the traditional series, the efficiency of electromagnetic pollution, size and rel

Production of common sense coil) x L7 N (U) ^ 6 I5 q2 n4 D 6 E1 \ 7 Z / (u / K-S c8 n; a0 f9 F # F5? 2 _) @ 3 f-Z1 e Benefits Q: Q, a quality factor of the coil is the coil inductance reactance (ie, AC resistance) at a specific frequency on the rati

What is DAB: DAB is Digital AudioBroadcasting short, following the AM, FM broadcasting traditional analog broadcasting after the third generation. This new transmission system anti-jamming performance, can eliminate the signal transmission of noise a