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RF (Radio Frequency) Transmitter Circuits
RF (Radio Frequency) Transmitter:   #'s       A - F       E - O       P - Z

Last Updated on:
Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :


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

1 Watt RF Amplifier -  This is a universal 1 Watt RF class C amplifier that is ideally suited for low power FM transmitters. Input should be at least 100mW to achieve 1W output. It is recommended to enclose the amplifier in a metal case.….(schematic design added 08/08/08)
1.3W VHF RF Amplifier 2SC1970 88-108 MHz -  This RF power amplifier is based on the transistor 2SC1970 and 2N4427. The output power is about 1.3W and the input driving power is 30-50mW. It will still get your RF signal quit far and I advice you to use a good 50 ohm...
1.5V Battery operated FM rebroADCast transmitter  -  This implementation is adapted to rebroadcast the output of a CD player, television receiver, or radio receiver. I use it so that I can move about the house and listen to my favorite programs without disturbing others. Within and the house,....
1.5V Tracking Transmitter (with Video Clip) -  The current draw for this tracker is 3.7mA, so the 1.5V button cell will last awhile. What the heck am I suppose to hear you ask? When your circuit is working you... [Tony van Roon's circuit]
100 MHz modulated RF source for FM Band  -  I needed a frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box.  A few minutes with VRStudio produced an ATtiny12 to make a tone, even fewer....(schematic / circuit added 6/07)
100Khz Crystal Calibrator -  There is a great deal of old amateur gear which many amateurs have decided to restore and bring back to life. While much of the early amateur transceivers work just fine they usually lack a digital readout and must rely on analog dials for tuning. The problem of dial calibration is complicated by the non-linear effects of tuning capacitors.  This month's circuit is a 100Khz crystal calibrator using an inexpensive microprocessor crystal and CMOS IC's which are readily available at Radio Shack.... [Radio Amateur Society of Norwich]
10W HF Linear Amplifier -  Electroinic design circuit…. [from Harry Lythall's website]
14MHz SSB 10mW Transceiver -  (electronic circuit added 05/06/07)
175kHz Inductive Pulse Transmitter -  This circuit is discussed in more detail in the Experimenters Journal. The transmitter’s six inch diameter coil launches powerful magnetic 175KHz ring pulses that can be detected by the circuit below.... [Designed by David A. Johnson]
1W Portable PLL transmitter -  This small FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the parts are placed on one circuit board. The RF power is….(electronic circuit added 08/07/06)
2 channel RF remote control -  This RF remote control it runs at 418MHz frequency and support up to 2 channels. It is very safety as the transmiting code is changing every time you push any button (roll-code function)….(electronic schematic added 03/09)
2 Valve 40m CW Transmitter -  amateur radio construction projects….circuit only, no description given…. [from Peter Parker's website]
2 Valve CW Transmitter -  Electroinic circuit design…. [from Harry Lythall's website]
222 MHz Transverter -  The original project was published in July'93 QEX magazine.  Before starting construction, collect all the parts to complete the 3 boards in the design: circuit boards, semiconductors, and surface mount parts, wire for inductors, xtal, toroid form, etc. In addition you may want to consider a case, connectors, PA, or front end switching (you may not require it, depending on the radio you use for an IF - or can be done with almost any small 12v relay). You may also need to build a 3 resistor pad to reduce the Tx RF level from your transmitter.... [Original Design by Zack Lau (W1VT), this project and supplemental notes by Rick Bandla (VE3CVG)]
2m-20m Transverter -  This little circuit is a transmitting and receiving converter (transverter) that converts a FT290 or similar multimode handheld transciever to the 14MHz amateur band. The project is a single board module that needs an external local oscillator, for example, the VHF harmonic oscillator (or QRP VHF FM TX) LO for transverter project. It should be a relatively simple matter of scaling coils.... [from Harry Lythall's website]
2m-20m Transverter -  This little circuit is a transmitting and receiving converter (transverter) that converts a FT290 or similar multimode handheld transciever to the 14MHz amateur band. The project is a single board module that needs an external local oscillator, for example, the VHF harmonic oscillator (or QRP VHF FM TX) LO for transverter project. It should be a relatively simple matter of scaling coils.... [from Harry Lythall's website]
2N2222 40 Meter CW/DSB Tranceiver -  In spring of 1998, NorCal sponsored a contest to design and build a project using no ICs and 22 or fewer 2N2222s as the active semiconductor devices. I thought this was a really intriguing idea, so I set about to design my version....(electronic schematic / circuit added 4/02)
2-transistor FM Transmitter -  While re are a plethora of similar 2-transistor schematics available, this one is above average. A major improvement over  little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio,....(added 10/05)

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RF (Radio Frequency) Transmitter:   #'s       A - F       E - O       P - Z


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