"HappyHolidays TRX" - A four band VXO tuned 1 watt QRP CW transceiver by PA2OHH
A simple, solid rig for outdoor use during Holidays. More is possible with this solid QRP rig than you should expect. Just try it and do not give up soon!
http://www.qsl.net/pa2ohh/fourbnd.htm

"HIS TRX" for the Barefoot Hiker! by PA2OHH
It is designed for the Barefoot Hiker. His life style is Back to the Basics and that is indeed what Barefoot hiking in nature and working with the HIS transceiver are. HIS is the abbreviation for He Is Simple!
http://www.qsl.net/pa2ohh/2bnd.htm

"MY TRX" All band CW transceiver 5 watt QRP by PA2OHH
"MY TRX" is indeed my transceiver. It is not a perfect transceiver, but good enough for a lot of perfect QSO's. The transceiver has general coverage reception from 1.8 to 30 MHz.
http://www.qsl.net/pa2ohh/01trx.htm

An experimental DSB/CW QRP rig for 20 and 40 meter bands by IK3OIL
The building of an HF phone rig today isn't shurely a simple job, however I'd like to propose an easy-tomake project, suited for portable or emergency use.
https://digilander.libero.it/ik3oil/_private/QRP%20sperimentale%20in%20DSB_eng.pdf

BIGODE - A RX, TX, TRX QRPp QRP for beginners by PY2OHH
This project is in homage to the colleague SK PY1AFA, GIL (Gilberto Affonso Penna) was director of our main Ham magazine. The name MUSTACHE (BIGODE) is because the Gil exhibited a great mustache.
https://www.qsl.net/py2ohh/trx/bigode/bigode1/begode1.htm

Four Band CW Transceiver by PA2OHH
The performance of the 80 meter CW transceiver using the phase method for side band suppression is very good. I had the plan to make a four band version to see how the performance of the phase method for suppression of a side band is for other amateur bands.
http://www.qsl.net/pa2ohh/99trxnl.htm

Homebrew CW Rig by ZL2CTM
Please see the YouTube videos for an explanation on the code and circuits.
https://zl2ctm.blogspot.com/2020/03/cw-rig.html

MOSQUITO MinimalistTransceiver by EA3FXF & EA3GHS
The main motivation of this new design is use a inexpensive high-power high­frequency MOS transistor like the IRF510.
http://ea3ghs.qrp.cat/mosquito.pdf

Portable QRP Multi-band CW TRX by DM3MAT
Here, I like to present my small portable QRP CW TRX, that I frequently use at home as well as outdoors, e.g. on bicycle tours. Hence the design constraints were: small size and light weight, low power consumption, CW QRP rig and at least 3 bands.
https://dm3mat.darc.de/cw2019/

BIGODE Multibanda - Um TRX CW 4W para 20, 15 e 10m by PY2OHH
Continuing our assemblies with the BIGODE, we showt here the triband version.
The choice of the bands was in function of the antenna that we have at the moment and had been 3 bands due the amount of keys 2 poles 2 positions to be used.
https://www.qsl.net/py2ohh/trx/bigodemulti/bigodemulti.htm

Tiny Tornado QRP Transceiver by KC6WDK
Here is a novelty 1-watt CW transceiver developed by KA8MAV that evolved from the"Pixie 2" and by just changing the output filter can be built for any band.
https://www.qsl.net/kc6wdk/QRP/tornado.htm

The NorCal Sierra: An 80-15 M CW Transceiver
Most home-built QRP transceivers cover a single band, for good reason: complexity of the circuit and physical layout can increase dramatically when two or more bands are covered.
http://www.arrl.org/files/file/Technology/tis/info/pdf/96hb1789.pdf

Wall Wart Powered "Joneset" Transceiver by K5BCQ
My criteria was: - Basic single tube (dual triode) Frank Jones "One Tuber" design point from 1935 for the receiver, but add an RF amp for isolation to prevent uneccessary radiation.
http://www.qsl.net/k5bcq/REGEN2/regen1.html