|
Regulated 24 Volt Output, 5 Volt Input DC to DC Converter - needed a few milliamps at +24 volts for a varactor bias circuit. Since my systems approach is still to run all of the power though a 5 volt regulator, this meant that I had to come up with a 5VDC-to-24VDC power supply. The resulting DC to DC converter and regulation circuit are described here __ Designed by Dick Cappels
Remote Control Transmitter - Although ready-made remote controls are easy to get, with this project we show how to build on at home. Features are impressive, with 6 radio channels and long battery life. Complete with PCB layout. __ Designed by Projects & Ideas from Nutchip.com
Remote Controlled Sign - Nowadays, remote controls are cheap enough to allow addition to any kind of electronic device, included simple ones. in order to have a remote controlled, __ Designed by Projects & Ideas from Nutchip.com
Remote Infrared Terminal - This unit provide 2 way iR communications using a numeric keypad and an LCD display. Data is sent and recieved in acsii with no regard to what the data means to any particular device __ Designed by Luhan Monat-Mesa Arizona
Remote RF Xmiter - This device was built into a small (1 1/4 by 2 inch) Radio Shack project box. it features four push buttons which can produce 2 codes each. (Pushing a button for less than one second sends the first code, holding it for over one second sends the second code.) __ Designed by Luhan Monat-Mesa Arizona
Repairs & Improvements - Visit Sweet, Roundabout, Hard2C, and Chicago for a weekend of simple fixes for line following, mini sumo, and solar power. See how different types of screws can help a robot slide, hide, and hold onto a gear. __ Contact David Cook
Resistor Substitution Box - PIC Project Commercial substitution boxes uses a lot of switches and a set of fixed resistors. The advantage is that they have a large range of resistance and work at higher voltages. This device is only good for use in circuits of 12 volts or so but it is much smaller and cheaper. it uses a log taper 2 watt potentiometer (Digikey part# KA1031S28) to produce a range of resistance values from about 50 ohms to 10k ohms. __ Designed by Luhan Monat - Mesa Arizona
RF Field Strength Indicator - Useful as a transmitter tune-up meter or an RF sniffer, this is an RF field strength indicator that is loosely based on the Broad Band RF Field Strength Probe, described elsewhere. it detects RF via a square law detector, basically its a crystal set with gain. The bias circuit for the detector is significantly modified from the probe to reduce the effects of battery voltage droop during use. __ Designed by Dick Cappels
RF Field Strength Probe - This broadband probe has a small antenna (about a 15 cm length of insulated wire). Radio Frequency energy coupled to the antenna is detected and made available to drive millivolt level signals to the input of a DVM (Digital Volt Meter). its battery powered for convenience with very low current drain and automatic shutdown for long battery life. __ Designed by Dick Cappels
RF Inductance Meter - needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn't need anything fancy, and since once a friend finishes his AT90S1200-based design, I plan to make one myself, I figured I'duse this for less than a year, so I didn't want to invest __ Designed by Dick Cappels
RF Remote Control Project - Making a RF radio link to control things remotely using the Basic Stamp ii and Ming RF modules. it can remotely control up to 16 different relays from up to 300 feet away. The relays could control anything from a tv to a motor. For my application I used this system to remotely start the engine of my truck. im tried of getting up in the mourning and have to go to school in a frezzing cold truck. __ Designed by Shaun Wilson
RF-Based Multiple Device Control - Here we describe how to control electrical and electronic gadgets from a remote location using radio frequency (RF) transmission. An RF interface is used instead of infrared (iR) to avoid the...__ Electronics Projects for You
RGB Mood Lamp - On this page I will explain how I created my own colour changing lamp with red, green and blue LEDs that fades between all colours of the rainbow. it really comes out well at night when other light are dimmed. in daylight conditions the colors aren't noticed well__
Roach Motel-Electronic - Using a PIC for this device provides a lot of useful functionality. The timing for the power pulse to the inductor is critical to getting the best Zap from your nine volt battery. The longer the current is on, the higher the voltage. Once the inductor reaches saturation, however, you are just waisting power. __ Designed by Luhan Monat-Mesa Arizona
Rolled-Off Noise Source - This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker. White noise creates is a "rushing" sound, which sounds something like air rushing by your ear (s). White noise would be flat with frequency, and since this circuit rolls off within the audio range, I refer to it as "rolled-off" noise. White (or rolled-off) noise __ Designed by Dick Cappels
Rotating Display - The left image is with the lights off the column of LEDs are rotating in a circle displaying the word "LEDS". On the right this image is with the lights on, the board can be seen rotating very quickly and a word appearing in mid air! __ Designed by Alan Parekh
Rotating light bulb beacon - Where I live in the suburbs, there is no street lighting, but every house has a light out front consisting of pole with a light bulb in a plastic globe. I had the idea of turning this into a weird looking rotating beacon as a halloween gag. Thus this lightweight construction made out of just tinfoil and masking tape __ Designed by Markus Wandel
Roundabout - This is an all-in-one intermediate-level robot that can explore rooms, avoid obstacles, follow lines, and compete in mini sumo (see the movies). The robot can be made in a variety of body styles with either a logic chip or microcontroller brain. __ Contact David Cook
Roundabout PCBs - instructions and tips for assembling Roundabout's electronics using the templates or ready-made PCBs available online. __ Contact David Cook
RS-232 to TTL Translator - A simple terminal program on a PC can have a lot of uses. The hang-up is that most of those uses involve communicating with a device running on 5 volts. I'vedone several schemes over the years but this one is my favorites. __ Designed by Luhan Monat - Mesa Arizona
RS-232 to Wireless Instrument Data Channel - This is an adapter that allows a terminal to communicate via a 100 MHz data channel with peripherals on the same desk top. Keystrokes from the terminal are received through the RS-232 connection and sent through the 100 MHz RF data channel. See the page, Digital Wireless for the Desktop, on this site, for the basics of the transmitter, receiver, and data format. The reason I made this was to make a simple method of switching between instruments on my desktop. I was staring to accumulate a number of microcontroller-based devices that I want to be able to switch my computer among quickly and this provided the simplest desktop networking solution I could think of. __ Designed by Dick Cappels
RS-232 Xlater - A simple terminal program on a PC can have a lot of uses. The hang-up is that most of those uses involve communicating with a device running on 5 volts. I'vedone several schemes over the years but this one is my favorites. __ Designed by Luhan Monat - Mesa Arizona
|
