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Amplifier Circuits: 
RF (Radio Frequency)

RF Amplifiers:  #'s - C      D - K        L - R       S - Z

Amplifier -- Main Page

Last Updated: December 30, 2017 02:25 PM

Circuits Designed by Dave Johnson, P.E. :
2.45ghz RF Signal Detector   -  This passive RF indicator is made from a few simple parts.  A 100uA moving coil meter is used to display the relative intensity of the RF signal.  This circuit can be used with some cell phones and many cordless telephones . . . Circuit by David Johnson P.E.-July 09, 2006

Cell Phone Charger   -  it seems that as cell phones become more sophisticated, their operating times become shorter and shorter.  If you are on the go all the time and have difficulty finding AC or DC outlets to charge your phone, you might consider this simple scheme . . . Hobby Circuit designed by David A. Johnson P.E.-June 04, 2000

Cell Phone Solar Powered Charger   -  The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v.  That voltage can be fed to any cell phone or USB connected portable device, to charge its battery.  The circuit uses a Reg113-5 voltage regulator from Texas instruments . . . Hobby Circuit designed by David A. Johnson P.E.-January 02, 2011

Characteristics of CMOS Logic Inverter Amplifiers   -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by David Johnson P.E.-February 11, 2006

CMOS Logic Inverter Amplifier Characteristics   -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Circuit by Dave Johnson P.E.-February 11, 2006

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 Watt 2.3 GHz RF Amplifier using a MRF2001 -  Simplicity and repeatability are featured in this 1-watt S-band amplifier design.  The design uses an MRF2001 transistor as a common base, Class C Amplifier.  The amplifier delivers 1-watt output __ Designed by Michael Micili

1 Watt 2.45 GHz Linear Amplifier using RF Micro Devices RF2126 -  Schematic Only __ Designed by Michael Micili

1 Watt Audio Amplifier Project (Using the TAA300) -  I built this audio amplifier with the TAA 300 Integrated Circuit   (IC) to have on the work bench an independent amplifier to test audio signals coming from radio receivers or audio oscillators.  It is an excellent amplifier to drive an eight ohm loudspeaker.  You can use it, for example, as an audio amplifier for the FM one transistor receiver known as the Radio Shack Special and/or the TDA 7000 FM receiver; also to test the workings of a pulse oscillator or any other kind of audio oscillators. __ Designed by braincambre500 @ yahoo.com

1.5w Power Amplifier -  Here we put all the theory to work and present a simple power amplifier module that can be easily built with readily available components.  The block diagram of the amplifier is__ Electronics Projects for You

10 meter (28MHz) band RF Amplifier -  If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do.  A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device.  The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU

10 MHz, Lumped Element, Anti-Aliasing Filter Design for High Speed 40 MHz A/D system  -  This classical, 5 stage, 50 ohm, Anti-Aliasing filter was designed for a high performance 40 MHz, 12 bit sampling A/D converter.  During the design phase, careful models were made of the inductor and capacitor Q's so that the design could be optimized without having to resort to many trial and error breadboards.  One breadboard was made to characterize the components and a second breadboard was done to finalize the design.  Monte Carlo analysis was preformed to verify the design over temperature __ Designed by Steve Hageman

100 Watt RF Power Amplifier for 2 GHz -  Turn an old 1.9 GHz PCS cellular phone basestation into a RF power amplifier. __ Green Bay Professional Packet Radio

100kHz to1GHz RF Power Detector -  LTC5507) __ Linear Technology/Analog Devices

100W FM Amplifier -  This Power amplifier is equipped with a bipolar transistor, the famous MRF317 As lots of FM amplifier application , the power transistor is in a C class bias.  All the impedance networks   (Input & Output) have been determined by using the __ Designed by Michel P

118MHz to 136MHz aircraft receiver -  Schematic only, no circuit description

12 to 1 RF, 25 GHz switch matrix (Solid State)  -  This 12:1, solid-state RF switch matrix was built for a test system application   (Test and measurement application).  The four layer PCB was designed with Coplanar waveguide over groundplane and Stripline techniques for very low sensitivity to manufacturing tolerances and very low assembly costs __ Designed by Steve Hageman

13.8V 30-40A Power Supply -  Schematic only, a powerfull power supply for my amateur radio equipment using four HEX FET transistors for regulation.  Text can be found at: http://www.agurk.dk/bjarke/Projects/PowerSupplyFET/PowerSupplyFET.htm __ Designed by Bjarke Korsgaard

1300MHz-1500MHz antenna with Amplifier based on two MAR-8 RF Amplifiers -  Schematic only, no circuit description

144 MHz 125W Power Amplifier -  Schematic only __ Designed by va3iul

144.00 Mhz 1.5Watt CW transmitter -  The Xtal osc is riped from an old AT-PC running 16MHz, it requeres 5.0 volt and use 18mA
those Xtal oscilators is accurate and needs no adjustment
The 5.0Volt 7805 regulator can also be ripped from the same old PC, then this transmitter, can be created for nomoney at all!  The CW-Keying is done by turning the PA-stage on or off with a P-channel FET or a PNP transistor
The PA transistor   (2N4427) gets a bit hot, this can be solved by incerting a resistor in the collector/powersupply, to reduse output to about 800mWatt. __ Designed by Thomas Scherrer OZ2CPU

160m mini portable End Fed Half Wave Tuner-MkII -  A small portable 160m EFHW tuner design.  This is the mini version of the previous version.  The air core inductor is replaced with a toroid and the variable capacitor is replaced with a fixed capacitor combination. __ Designed by S.Spirat, Steph de VK5ZVS

18 DB LT1253 DDS Amplifier -  This 18 dB gain amplifier was built Manhattan-style to evaluate the LT1253 dual video amplifier as a candidate output amplifier for DDS systems employing the Analog Devices AD9850 and similar devices.  This dual amplifier was chosen to take advantage of its high gain-bandwidth product.  By utilizing both amplifier sections, a very broadband   (100 KHz to 30+ MHz), high gain system could be built. __ Designed by Jim Kortge, K8IQY

1-Transistor Amplifier/Detector -  An amplifier may be added to boost the audio level as shown below.  The current consumption of this amplifier is quite low and a power switch is not included.  Disconnect the battery when the receiver is stored for long periods. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

1W RF Power Amplifier for iPOD Stereo FM transmitters -  This project explain how you can build and connect a powerful 1W amplifier to your FM transmitters.  A perfect solution for those wishing to listen to their favorite tunes in the car, house, garden, school, campus, party, you name it.  Why not share your music with every one else in your city!

2 Channel RF AVR Remote Control -  How many times you needed some remote control to handle some electric device ? many times.  There are lot of remote controls like infrared, RF, SMS   (like my other circuit) and more.  The basic small-range remote controls are 2, Infrared and RF   (Radio Frequency).  One of the weaks of Infrared is that the signal can not pass the walls.  So, if you want to control your garage door, the only way is to use some RF remote control.  The circuit   (transmitter and receiver) use few components and ordinary   (I love few component circuits).  Its easy to build it because you don't have to tune-up any coil or variable capacitor.  The RF modules are fix to work in 418MHz area. __ Designed by Vassilis Serasidis

2 Transistor Reflex Radio -  Schematic & PC Board, no circuit description] __ Designed by David Hoult

2.3 GHz Power Amplifiers -  Note: quality of  text is poor. __ Designed by RL Campbell KK7B

2.3GHz to 432MHz RX converter for Yaesu FT817 -  This very small RX converter fits on the backside   (yes the small side at the back) of the Yaesu multiband allmode transceiver FT817.  And it even operates on the internal batteries of the transceiver   (without modification of the FT817).  And it can be configured for either input frequencies around 2320 MHz or for the satellite downlink at 2.4GHz   (very interesting for receiving satellite signals from the new phase 3D amateur radio satellite).  Design is completed for quite some time, I just have to do the documentation.  I will try to publish it asap. __ Designed by Herbert Dingfelder

2.45ghz RF Signal Detector -  This passive RF indicator is made from a few simple parts.  A 100uA moving coil meter is used to display the relative intensity of the RF signal.  This circuit can be used with some cell phones and many cordless telephones. . . Circuit by David Johnson P.E.-July, 2006

20dB VHF Amplifier -  The amplifier is a circuit of high frequency RF with distinguishable materials.  The amplifier as circuit strengthens the tendency of signal with concrete aid, depending on the frequency of signal.  If the frequency of signal is included in the limits of spectrum of frequencies. __ Contact: IQ Technologies

20W VHF Linear Amplifier 2SC1946 50 MHz  -  This VHF linear amplifier works for 50 MHz frequency using 2SC1946A with power output about 20 Watt.  It needs input 30mW and output 25W for 150 Mhz.  It seems can be used for 144 Mhz without modification.  There are Power IC and 2SC1946A with low-pass filter on the board. __ Designed by JO1ACW, June 3, 2002

23 DB Bipolar DDS Amplifier -  Some recent discussions with George Heron, N2APB and Craig Johnson, AA0ZZ regarding alternatives to using MMICs as amplifiers in DDS applications lead to the design of this 23 dB shunt feedback amplifier.  This version is setup to operate at 12-13.8 volts, but with minor changes, can be made to operate with supply voltages as low as 5 volts. __ Designed by Jim Kortge, K8IQY

2304 & 3456 MHz Power Amplifiers -  Note: quality of  text is poor. __ Designed by Greg McIntire  AA5C

25W FM MOSFET RF power Amplifier based on BLF245 -  This new FM Power amplifier is equiped with the famous MOSFET transistor: the BLF245.

Depending on the output power level your FM synthesizer is able to provide, you can use or not the 2N4427 driver stage.  We've chosen the synthesizer n1   (described on this Website) to drive this amplifier unit.  By the way,we will use the 2N4427 driver stage to boost properly the BLF245 __ Designed by Michael P.

2m (144MHz) Dual Gate FET Low Noise Amplifier -  My good old FT-290 2m SSB and FM radio, had about 1uV sensitivity before installing this amp. 
Now it is 150nV just like the best radios I have tested.  Stations I could hear with noise, are now loud and clear !! __ Designed by Thomas Scherrer OZ2CPU

2-transistor Radio -  Here is a simple radio that was designed to minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as high as the one-transistor reflex but the simplicity is attractive.  Strong stations will provide plenty of volume __ Contact: Charles Wenzel of Wenzel Associates, Inc.

2W RF Amplifier for 24/23 CM -  This page describes TX ATV Transmitter for 23 cm with output adjustable from 100 to 250mW


RF (Radio Frequency) Amplifiers:  #'s - C      D - K        L - R       S - Z

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