KD1JV Designs

QRP Kits and Projects for the low power Amateur Radio enthusiast

Steven "Melt Solder" Weber

SKC Simple Keyer Chip II. The SKC is a basic iambic keyer with selectable Iambic A or B modes of operation. The keyer now includes two, 30 character message memories. Sequenced audio mute and transmitter keying outputs along with sidetone output allow for easy intergration into homebrew rigs. 8 pin dip IC and two 2N7000 mosfets for mute and keying output buffering.

Operating instructions and wiring diagram

Sorry, out of stock until September - gone hiking!

Price: Only $3.00 per chip plus $2.00 postage per order. Please mail check or cash to address at top of page.

DX orders to outside of NA, use $3.00 for postage and you may use paypal using gmail address above.

http://groups.yahoo.com/group/AT_Sprint

Check out Hendricks Kits for additional kits designed by KD1JV and other talented designers.

Need Parts? Check out these friends of mine:

Kits and Parts W8DIZ, Diz, the Toroid king!

The Parts Place K5NWA, Cecile, makes my site possible!

QRPme W1REX, Rex, unique and inexpensive kits packaged in tunna tins!

"Build it from Scratch" Home Brew projects

These projects are not available as kits. Circuit boards for some projects are available from FAR Circuits. If you email me with a question about a project, I may or may not respond depending on what your asking for!

Notice: all projects are copyright by Steven Weber, 2010 and are presented here for individual, non-commercial use only.

72 part contest rig: This 30 meter rig with superhet receiver and xtal controlled transmitter won "Honorable mention" in the 2010 FDIM ACRI design contest. Uses a LM386 audio amp as a combination product detector / audio amp.

Wireless Morse thermometer: Build a wireless thermometer which transmits the temerature in degrees F or C to your HF receiver in Morse code! Uses Atmel Tiny13A processor and Maxim DS18B20 digital temperature sensor with micro power crystal oscillator. Source code provided, programmed Tiny13A chips are available.

WWV Reciever - Simple Direct Conversion receiver to use with a PC to calibrate a 10 MHz VCXO.

The MAS-80 - Designed to be competative in the DL 80M "Mininum Art Session" contest, this rig features a crystal controlled 2W transmitter and a sensitive regenerative receiver, using 51 discrete parts on a 3.5" x 2.5" circuit board.

The ADC-40 - All Discrete Components 40 M transceiver with super-het receiver using no IC's, just a whole bunch of transistors of various flavors (NPN, PNP, J-FET, MOSFET)

Amplified speaker in Altoids tin. Built for use with MP3 player, but can be used with other headphone only devices. (PDF file)

PSK Transceiver Unique transceiver design does not use a SSB transmitter!

PSK Transceiver, version 2. Simpler circuit, easier to use, version of the above.

The MMR-40 Winner of the ARRL Homebrew challenge, non-PC option category.

A 40 meter CW/SSB transceiver using less than $50.00 in parts. How to build "dead bug" style.

The AP-80. Moderately complex, but inexpensive to build 80 M Transceiver with DC Rx.

SSB1 (Fairly) Simple SSB rig with PTT for 75 meters NEW improved circuit and board layout

SSB2 Revised (Fairly) Simple SSB rig, two part system, exciter, receiver, and 25 watt linear for 75 meters. Exciter board PCB layout now included!

SSB3 Experimental SSB exciter/receiver using bi-directional amplifiers and analog switching mixers.

DCRX Deluxe Direct Conversion Receiver. Immune to AM SWBCI.

SWRX Short Wave AM Broadcast Receiver. Simple, inexpensive and effective.

CW SPKR 600 Hz Resonant speaker. Folded channel box design. Makes an amazing difference!

ALT Altoids L Tuner (ALT) "L" tuner for half wave end feed antennas.

The "Tenna Dipper" Poor mans antenna analyzer, shows resonance of antennas, 80-10 M operation.

The "Tuner Dipper" Similar to the Tenna Dipper, but fixed crystal controlled frequency, used to adjust antenna tuners.

Linear scale analog RF power meter.

PS 0-14 volt, 0-2 amp current limited variable power supply regulator

LED battery voltage monitor. A fuel gage for your gel cell battery.

ANT Portable 40/20 trap dipole.

TX Tube Transmitter with 5763 PA and grid block keying.

LED headlamp projects:

Using an AVR Tiny13V microcontroller as step up (boost) or step down (buck) voltage converter for driving a white or high power LED. (pdf file) Desgin equations and source code included.

Atmel AVR Butterfly projects

Reprogram the inexpensive Butterfly demo board for these ham radio applications:

AD9850/ AD9851 DDS display/controller. Rx/Tx rig VFO and signal generator applications

Digital Power / SWR meter, 0-9.99 watts

Iambic keyer. Displays what your sending on the LCD display. Includes 2, 120 character keyer memories, 5 to 40 wpm speed and tune mode. Now includes 5 random character code practice generation.