Radio Frequency Circuits |
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| Listed in | Wireless on position 29 and overall rank is 18482 |
| Country | Indonesia |
| Language | English |
| Owner | bcasthardware |
| Member Since | July 30, 2008 |
| URL | http://rfcircuits.blogspot.com/ |
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| Tags | fm_tv_transmitter rf_antenna rf_filter | rf_power_amplifier rf_transmitter | transmitter | |
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Latest Posts on: Radio Frequency Circuits
Retrieved latest 5 posts at: http://rfcircuits.blogspot.com/feeds/posts/default?alt=rss
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. O..
Posted on 23 September 2009 | 6:17 pm
Power Supply with Short Circuit Protection 13.8V 30-40A
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..
Posted on 23 September 2009 | 5:58 pm
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 e..
Posted on 23 September 2009 | 1:56 pm
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 surveil..
Posted on 15 November 2008 | 7:23 am
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...
Posted on 28 October 2008 | 2:28 pm