2N2/40 - Original 2N2/40 CW Transceiver by K8IQY
In the fall of 1997, the Northern California QRP Club (NorCal) sponsored a contest. The contest objective was to design and build a functional amateur radio transceiver, using a maximum of 22, 2N2222 type transistors.
http://www.k8iqy.com/qrprigs/2n240/2n240page.html

40m Cristal Pixie by PY2OHH
The famous Pixie is a little CW QRP, probabily the most popular in the Ham world. The schematics is easy to find over the internet, from brazilian to japaneses sites, in that way I find my first Pixie and a lot of mods.
http://py2ohh.w2c.com.br/trx/pixiecristal/pixieacristal.htm

40m DSB Transceiver by MØDAD
After building several CW and low power AM transmitters, I decided it would be good to have a go at building another phone transmitter. I decided to build a DSBSC( double sideband suppressed carrier) transmitter.
http://www.lightandcolours.com/m0dad/construcion/40m_dsb_transceiver.htm

40m DSB Transceiver by PY2OHH
4 W - 7050 TO 7130 kHz with Ceramic Resonator. This page contains only schematics who speak for themselves.
http://py2ohh.w2c.com.br/trx/transceptordsb40m/transceptordsb40m.htm

40 Meter Glowbug and Power Supply by KD6CC
This is 40 Meter, 3 Tube Qrp Transceiver. It has a Regenerative receiver that uses a 3A4, and a two tube transmitter using two, 3S4's for approximately 2 watts output.
http://www.qsl.net/kd6cc/glowbug/

49er Tupiniquim Transceiver by PY2OHH
This project was born when talking with Carlos PY2CSU, we discussed about which transceiver type would be easy to build, with available parts and showing good results. After the 49er came this!
http://py2ohh.w2c.com.br/trx/49er/transceptor49ertupiniquim.htm

7MHz CW transceiver by JF1OZL
7MHz is best band in order to make domestic QSO. But 7MHz ssb is too crowded to make QSO with QRP. Therefore 7MHz CW is best way to make domestic QSO. I will show you my handmade 7MHz CW QRP trx.
http://www.intio.or.jp/jf10zl/7mcw.htm

7MHz SSB Transceiver by VU3PRX
The transceiver described here is remarkably simple based on popular communication building block MC1496. It is fairly simple to build because most of the functions are performed by MC1496.
http://www.flashwebhost.com/tcvr/

7TR1015BB “All PNP on Breadboard” Transceiver by JH5ESM
A QRP transceiver for 7MHz CW only made of single kind of general purpose PNP transistor is presented. No other semiconductor devices (even diodes!) are used. The circuit is built on a solderless breadboard so that it is easy to build, repair and modify it.
http://homepage3.nifty.com/jh5esm/homebrew/7tr1015bb.html

A 40 meter QRP-Transceiver by DL5NEG
This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some years ago.
http://www.herbert-dingfelder.de/7mhz_trx/40m_trx.htm

A facelift for the 40 meter QRP-Transceiver by DL5NEG
I had developed the 7 MHz CW TRX for my first trip to the US. The receiver worked very well. (Actually a lot better than here in Europe since they do not have high power broadcast stations on 7.1 MHz).
http://www.herbert-dingfelder.de/facelift_7mhz_trx/facelift.htm

A 40 meters CW QRP transceiver by IK3OIL
This project describes a little QRP transceiver “full legal power” (5W at 12V) for the 40 meters band. The RIG may be built in a gradual manner, in fact it is divided in two main modules, ...
http://www.ik3oil.it/_private/Rtx_40_eng.pdf

A 40 meter SSB QRP transceiver by XQ2FOD
In the ages old Q-code formerly used in telegraphy communication, "QRP" meant "please reduce power", or, if followed by a question mark, "should I reduce power?" Well, Morse code is slowly dying out, ...
http://ludens.cl/Electron/pqd5/PQD5.html

An optimized QRP Transceiver for 7MHz
Here is a rig that provides real challenge for the QRP home builder. Nonetheless, this is a classic circuit and a favorite in the QRP community.
http://www.arrl.org/tis/info/pdf/93hb3037.pdf

ARARINHA #1 - Simple QRP SSB TRX 40m 4W by PY2OHH
A simple transceiver QRP of SSB, with 4 Watts of harnesses for 40m. After building the BITX, we rethink the project with integrated circuits and arrive at a surprising result. With few components we develop a simple and efficient transceiver.
http://py2ohh.w2c.com.br/trx/ararinha1/ararinha1.htm

ARARINHA #2 - Simple QRP SSB TRX 40m 4W by PY2OHH
A simple transceiver QRP of SSB, with 4 Watts of output power for 40m
http://py2ohh.w2c.com.br/trx/ararinha2/ararinha2.htm

A Simple SSB Transceiver by Ashhar Farhan
A dual-band transceiver with a crisp receiver and a clean SSB signal is described. It started its life as an investigation of the excellent S7C receiver described in EMRFD.
http://www.phonestack.com/farhan/xcvr1.html

Building the KD1JV MMR-40 "dead bug" style by KD1JV
What is the MMR-40? It is a 40 meter rig with SSB (voice) and CW (Morse code) operating modes. This is a low power (QRP) rig with up to 6 watts CW or PEP (peak envelope power) output. This rig was designed for the ARRL Homebrew Challenge.
http://kd1jv.qrpradio.com/ARRLHBC/ARRL_MMR40.html

CAIAPÓ - 40m CW Transceiver 1W with 74HC4066 IC by PY2OHH
Following the experimentation with the 74HC4066 chip we decided to build a transceiver based in the receiver described here in this page.
Once more we look up the articles of our friend and namesake PA2OHH Onno, and we observed that it will not be so difficult...
http://py2ohh.w2c.com.br/trx/caiapo/caiapo.htm

CURUMIM - The world smallest 40m CW transceiver by PY2OHH
After the success of the CANARINHO and the CURRUIRA we decide to made a transceiver with the minimum number of discrete components. This is the CURUMIM.
There are only 12 components! We assembly in two modules, we try some different audio circuits. But the audio amplifier using the LM386 was the best.
http://py2ohh.w2c.com.br/trx/curumim/curumim.htm

Forty - Oner by SP5DDJ
This name and part of schematic are taken from 49'er where 40 represents the band, and 9 is 9V battery to supply the rig.
http://www.qsl.net/sp5ddj/forty-oner.htm

GOITACAS - 40m 5W transceiver with 74HC4066 by PY2OHH
In the last project with the 74HC4066, it it was acting as to mixer, buffer, oscillator VXO and driver in the Tx. In order to increase the power, I decide to substitute the VXO who uses na analogic gate of the 74HC4066, for a VXO using a BJT transistor. Now the two remaining analogics gates are in parallel circuit.
http://py2ohh.w2c.com.br/trx/goitacas/goitacas.htm

Homebrew 40m CW Transceiver by 7N3WVM
Homebrew 40m CW Transceiver. Frequency range 7.000-7.030 MHz. RX part: Superheterodyne with RIT and side tone. TX part: Output power 3 Watts with 7.5 Volts 1.0 Amps.
http://www.qsl.net/7n3wvm/xcvr-40m.html

JABAQUARA - A 40m Transceiver by PY2OHH
The idea for the JABAQUARA was born in the Yahoo list QRP-BR, where folks always spoke very well from the SW-40, then we resolved to take the enterprise of "tropicalize" the SW-40.
http://py2ohh.w2c.com.br/trx/jabaquara/jabaquara.htm

JURITY - 40m CW superhet transceiver by PY2OHH
Sometime back I was visited by PY2CQM ... As he gave an american book about RF as a gift, I asked him how could I repay for it... and this way I was without my super heterodyne transceiver for 40m and the JURITY project was born.
http://py2ohh.w2c.com.br/trx/jurity/jurity2.htm

LACRAIA - A different 40m CW Transceiver by PY2OHH
We show here the "LACRAIA", a transceiver based in the 74HC240, an 8 gates inverter buffer IC. This transceiver was born from the experiments done using high speed digital ICs in radio frequency applications.
http://py2ohh.w2c.com.br/trx/lacraia/lacraia.htm

New 40 meter QRPp Radio by WA6OTP
This is the new Transmitter/Receiver rig for backpacking. It is 3 inches square. It is the same radio as the 80 meter rig. The PTO tunes 150 kc of the band. With one turn it tunes 12 kc.
http://www.wa6otp.com/40.htm

Pixie 2 DSB Modulated by PY2OHH
In my might a DSB Pixie is a big challange, knowing that I had excellents results from a CW Pixie and a chance to study a DSB modulation. We come again to internet and collet more informations, now about SSB and DSB.
http://py2ohh.w2c.com.br/trx/pixiecristal/dsb/pixiedsb.htm

PT40 - 40 Meter Transceiver by AA3SJ
This was my first attempt at putting together a few "pet" circuits to make a transceiver. Special thanks to Mike, W3TS, and to Wes, W7ZOI, for helpful and much appreciated elmering.
http://www.qsl.net/aa3sj/Pages/H-40.html

The ADC-40 All Discrete Component transciever by KD1JV
The all discrete component transceiver described below is a throw back to yesterday, when we didn't have fancy IC's to work with. In the QRP sprit of "doing more with less" I set out to design a no IC, VFO tuned transceiver with super-het receiver with reasonably good performance.
http://kd1jv.qrpradio.com/ADC/ADC-40.htm

The simple 7MHz CW transceiver made with Motrola MC3362P by JG1EAD
I made a 7MHz CW transceiver by using the IC for the narrow band FM double super receiving circuit, MC3362P. I intended to make a transceiver for 10MHz band in the beginning.
http://www.cqham.ru/projects/7mhz_trx/e_mc3362.htm

Tualatin 40 Meter Superheterodyne CW Transceiver by NT7S
The Tualatin is a superheterodyne 40m CW transceiver designed for the 2007 FDIM Potluck Contest. I was fortunate enough to win the contest with this design, but wasn't able to personally attend the event.
http://www.nt7s.com/index.php5?page=tualatin

Transceiver ultra-simple sur 40m de F6FEO
Voici la description d'un transceiver ultra-simple pour le décamétrique. La version décrite ci-après est monobande, mais rien n'empêche de la réaliser multibande.
http://f6feo.homebuilder.free.fr/transceiver_ultrasimple_40m.html

Un transceiver Low Cost Le SANTERRE de F6FEO
Ce transceiver a été calculé pour le trafic sur 7 Mhz, bande délicate car étroite et soumise à de forts signaux en fin de journée.
Par simplicité, j'ai fait appel aux mixers actifs à cellule de Gilbert que sont les NE602 ou 612.
http://f6feo.homebuilder.free.fr/transceiver_SANTERRE.html