RSS Radio Frequency Circuits
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累计：25 篇（自 2009-10-10 起）
更新：约11篇/年，最后更新856 天前
Radio Frequency Circuits
Variable RF attenuator with PIN diode
variable rf attenuators are often used to control the level of a radio frequency signal using a control voltage in rf design. these variable rf attenuators can even be used in programmable rf attenuators. here the known voltage generated by a computer for example can be applied to the circuit and in this way create a programmable rf attenuator.often w... (303 天前)
Radio Frequency Circuits
Power Supply with Short Circuit Protection 13.8V 30-
here's a safe power supply with short circuit protection. the power supply is build around the lm723 controller and four buz24 (or irf150) power n-channel fet transistors. fet transistors are used because of the simplicity of controlling the current through these transistors, it's simply voltage controlled, and because of the low power consumption of th... (303 天前)
Radio Frequency Circuits
RF Power Meter Reading by Digital Voltmeter
the rf power meter circuit is based on the ad8313 log detector manufactured by analog devices. in gsm phones ad8313 is used as a log detector, part of the power control loop circuit. generally could be easy identified near the power amplifier module.ad8313 is a logarithmic detector which can accurately convert an rf signal at its input to an equival... (303 天前)
Radio Frequency Circuits
Surveillance Transmitter Detector
this surveillance equipment is fm bug detector. the circuit can be used to "sweep" an area or room and will indicate if a surveillance device is operative. the problem in making a suitable detector is to get its sensitivity just right; too much and it will respond to radio broadcasts, too little sensitivity and nothing will be heard.this surveillance ... (303 天前)
Radio Frequency Circuits
30W VHF Amplifier with 2SC1946A
here is an 30 watt fm amplifier schematic that provides an appropriate power boost with an input of 4 watt up to 6 watts (2sc1971 driver amplifier recomended). the circuit is designed to cover 88-108mhz vhf fm broadcast band. however, the circuit is very stable at my place and provides a clean-output through 7 elements butterworth low pass filter.the ... (303 天前)
Radio Frequency Circuits
40-900 MHz Signal Amplifier-Booster
this is a small amplifier of signal that cover the frequencies from 40 to 900 mhz. those frequencies include tv in vhf and uhf and also radio in the frequencies of 88 - 108 mhz, strip of fm. the signals in up to 20 db, becoming possible to receive even the weakest signals. below is the circuit diagram.the circuit is built in turn of an uhf broadband t... (303 天前)
Radio Frequency Circuits
FM Transmitter With BF494
this is a small circuit fm transmitter using transistor bf494 . the reach of the transmitter will depend a lot on this antenna, of the feeding of the circuit and of the place where will happen your operation.with a feeding of 6 v (4 piles aa) and an antenna of about 40 cm of length, we can arrive to the 200 meters. with a smaller antenna, or in place w... (303 天前)
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