RF (Radio
Frequency) Transmitter Circuits
RF (Radio Frequency) Transmitter: #'s
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P - Z
Last Updated on:
Thursday, December 07, 2017 02:04 PM |
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Circuits Designed
by Dave Johnson, P.E. : |
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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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] |
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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)
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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)
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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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