This application note demonstrates simple hardware and software techniques for driving and controlling 3 common four-coil stepper motors by one Stamp II board. The below text / work is a modified version of Parallax, Inc. single axis Stamp I driver. The program is adjusted to run 3 motors simultaneously on a Stamp II board. The board as been tested succesfully with stepper motors from RS.[more]
This example uses Tigertronics RTX-12 Radio Modem and Parallax BASIC Stamp 2, though it may be substituted with any microcontroller. The example includes two sets of programs: a simple version that lacks error checking and a more complete example with checksums. [more]
The Nickel-O-Matic robot was designed as an exhibit for the ChiBots booth at iHobby Expo ‘08 in Chicago.The main design goal was to provide a machine that was entertaining to watch and produced a tangible take home item. With inspiration from Rube Goldberg and the penny arcade machines of the 1900s.[more]
This handy gizmo is ideal for checking the output power of your R/C transmitters. Four super-bright LEDs are used in place of the usual analogue meter, allowing for easy viewing of the monitored RF signal. An on-board variable capacitor sets the frequency for 27Mhz, 35MHz or 40Mhx transmitters. Ham Radio operators might wish to experiment with the front-end L/C tank for frequencies other than standard R/C.[more]
This is a general purpose remote control project with using programmable PIC microcontrollers. This project can be used with infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Well-known such IC-s are Holtek HT-12D, HT-12E and Motorola MC145026, MC145027, MC145028.[more]
The controller consists of a small circuit board which fits inside the rotator control box .With this unit the rotator gains automatic heading seeking, computer control, and even heading control by clicking on a map or selecting a country prefix.The controller could also form the basis of a self-contained replacement controller, for rotators with faulty or missing controllers. [more]
This is a Crystal controlled 147.460 MHz FM transmitter called XFM1.The XFM1 designed for model rockets but suitable for wildlife, balloons and many other applications requiring a small, frequency stable FM transmitter. Use this transmitter with a scanner or 2 meter amateur radio receiver. Transmitter ground range is approximately 400 yards (5 feet above ground) . Field tests were done with a ICOM IC-W32A transceiver with 0.16 micro volts of receiver sensitivity through the standard 8 inch antenna. [more]
Five by Twenty : A 5 tubes SSB QRP Transceiver for 20m Ham band.It is a true SSB transceiver built around just 5 vacuum tubes, with no transistors nor ICs. Superhet receiver with AGC and S-meter drives a loudspeaker, 5W transmitter. Very stable VXO uses CB crystals to cover 20m Ham band.[more]
Here is a quick guide to making electronic components easy to identify and troubleshoot.
Among other tools is an automated Ohm's Law wheel and dozens of calculators for electronic techs.