Description: A Digi-key CT300S-ND rotary encoder is used at the Vane and the output encoded to show wind direction a 16 LED circular display. IC used is 74HC154. A very neat project.

Description: This project provides a means to monitor the activity on up to 30 different frequencies and display the activity on the LCD display or to a PC via the serial port. The Channel Watch circuitry uses the memory up button through the radios' microphone to scan the frequencies and then monitor if there is audio on that channel via the VOX circuitry on the Channel Watch board. IC's required: two PIC16F84, DMC16117AN, LM386, and MAX232. The source code for and the Channelwatch.exe programs are at oak.oakland.edu/pub/hamradio/arrl/qst-binaries or from the ARRL Bulletin Board at 860-594-0306.

Description: The digital meter uses Cds or Phototransistors available from Radio Shack, LDC meter PM128, (3) 2n3904, (2) MPF102, (1) TIP32 transistors.The analog meter uses 0-1 ma meter, LM317, (2) MPF102, Cds cell, 2n3904. Each board is 1.6" by 3.1"

Description: This is the PC board to build the nine note tone generator for reference note tuning of violin, guitar or any other instrument. Uses standard 5% resistors, trim pots for calibration, 2N3904, 2N3906 , TIP31, and 7805.

Description: The project is a dual thermometer with a two digit led readout. The temperature sensors are LM34CZ voltage reference ICs; circuit uses LM358, LM317LZ, 7805, 7445, and a 84C71 pic processor. The mini kit consisting of 4 mhz crystal, dual LED display, P C board, and the programmed PIC processor is available. P C Board separate available also.

Description: The unit measures RFI over a 500 Mhz range using the Analog Devices 8307 IC. The level is displayed on ten LEDs driven by Rick's favorite IC, the LM3914. P C Board size is 2" by 2.25".

Note that there are a couple errors in the article. First, there are two C1's on QST's schematic. The C1, located next to C5, should be C6. Also, the schematic shows a 0.1 cap on pin 4 of U1 but on the PCB itself, it's on pin 5. No matter--works the same either way. Follow the PC layout. C5 (10 uF) is the only electrolytic on the board. A couple people have written the author to say they've got their units working

Description: The p c board available for this project is 6" x 3". Circuit contains MAX186CPP, PIC16C63A, MAX525BCPP, and LM2936z. The programmed PIC is available from the author for $20.00. The system is a 12 bit, 8 channel A/D ant a 12 bit 4 channel D/A with 8-bitbi-directional I/O serial port.

Description: this is the circuit designed by Hamption W. Shirer from the University of Kansas. The details for the project can be found at htttp://bub2.met.psu.edu/default.htm. The project consists of:

LIGHTING STROKE SIMULATOR board

GP-1 TRACK/HOLD board

GP-1 SIGNAL SOURCE board

GP-1 SIGNAL GATE board

GP-1 LOW PASS FILTER board

LIGHTNING STROKE SIMULATOR POWER SUPPLY board

LIGHTNING STROKE SIMULATOR MULTIPLEX OUTPUT SET board

LIGHTNING STROKE SIMULATOR WAVEFORM GENERATOR board

GP-1 PREAMP-INTEGERS board

Description: A innovative project to replace the light bulb in a flash light with LEDs. The PC board is 1.87" diameter and mounts the eleven LEDs and current limiting resistors.The kit consists of 11 5000mcd LED's, 11 330 1/4 watt resistors, and the PC board.

From Allen AB0SD: ab0sd@iowatelecom.net The board fit perfectly in the reflector of a 3-D cell Maglite. Soldering everything together was simple enough. I would like to mention two points on construction: Understand how the circuit works before soldering. It is much easier to space the LEDs nicely then. Unless you want to glue the board to the reflector, you should solder the LEDs with a long enough lead so that they will push against the lenses. The finished product is quite pleasing. The light produced is white, and does not wash out details. The negatives are that it does not provide a concentrated beam at long distances. It provides excellent light for searching/reading and finding your way. It does not throw the deep shadows incandescent bulbs do, and will provide increased battery life. The LEDs I chose were Lumex white LEDs, with 2300mcd output available from Digikey (#67-1604-ND).

Description: Detailed information may be found at http://davidbray.org/onewire/barometer.html

Description: This project is for a large seven-segment display. Each board is 3.75" by 5.5", and has 23 LED's arranged in a seven-segment display and has a 7447 on each board so that they can be driven from a DCB logic signal. Great board for a clock or timer display. Six boards cost $30.00 for the set.

Description: This is a 70cm rocketborne radio telemetry system which sends back the temperature on 433Mhz. The transmitter boards measure 7" x 1.15" and uses 4011, 4046, and a Radio Shack 900-6896 433 oscillator. The receiver decoder board is 4.25" x 2.4". and uses a 555 pulse detection and a 433 radio receiver

Description: The circuit detects electrical energy in the 300Khz range and lights a light when the lightning is detected. 3- 2N4401 and one 2N4403 transistors and the unit is powered by a 9 V battery. Board is 2.75" by 1.75".

Customer Comment: I built 3 of the sequencers in a couple evenings and installed in a box. They sequence relays for my satellite/6 meter station. They worked great! The boards were first class and I would recommend Far Circuits to anyone.

Description: This is the same as the original circuit but uses a DC to DC converter to step up the voltage to 36 Volts. The kit includes the pc board, the step up DC to DC converter, 78L05 and the 4 opto couplers, all the remaining parts are available from Radio Shack.

Description: I now have new updated code for the PIC. The upgraded IC is $10.00, when ordered alone and separately. If ordering the complete mini kit, specify the updated PIC in the order and it will be included.

Customer Comment: Bill VanOrden wrote: " I am more than pleased with the quality of the board and the overall design and the function on the kit."