Thomas Driemeyer – Bicycle Guide

“I often get asked about bicycle maintenance and repairs, and tips for how to ride efficiently. This little manual is intended as a summary of what I have learned over the years. I am not a professional mechanic.

Thomas Driemeyer – Bicycle Guide

All of what I say here is the result of personal experience and opinion and may in places flatly contradict professional techniques, but it has served me well. I offer no guarantees that it will work for you. If your bicycle falls apart because I said something wrong, you are on your own.” – Thomas Driemeyer .

Computer-controlled LED lamp

Computer-controlled LED lamp

This page shows how to build a lamp using this module that can be programmed to show any color or cycle of colors, as instructed by a PC or Mac over a serial RS232 line. (Or USB, using a cheap USB-to-serial adapter – unfortunately USB cables cannot be longer than about two meters before they become either unreliable or very expensive.)

DSO Nano – Digital Storage Oscilloscope

DSO Nano v2 is an Open Source Portable and lightweight Digital Storage Oscilloscop that has a Color display and is designed for basic electronic engineering tasks. Its palm size and handy features make it great for in-field diagnosis, quick measurement, and hobbyist projects. Schematics and source code files are also openly available for re-innovating.

DSO Nano –  Digital Storage Oscilloscope

Auto measurement – Useful for quickly exploring signal characteristics. Measurement options include frequency, cycle time, duty cycle, peak voltage, RMS voltage, average voltage and DC voltage. Please note that frequency, cycle time and duty cycle can only be measured while triggering.

DSO Nano - Digital Storage Oscilloscope

Features – Waveform storage and playback, 6 triggering modes, 200Khz Analog Bandwidth, Complete measurement markers and signal characteristics. Built-in Signal Generator too.

User Interface Overview – The screen is broken into a central display area and 3 operation bars around it. The menu on the top provides the most frequently-used adjustments to signal display. The status bar on the bottom provides precise measurement results and monitoring status. Adjust more advanced functions with the column of function icons on the right.

Ozitronics – Electronic Kits

“Audio Amplifiers, Voice Recorders Clocks, Counters & Timers, Data Acquisition & Control Educational Kits, Test & Measurement ”

Ozitronics – Electronic Kits

K1001 – 8 Channel Serial Servo Controller, Assembled & Tested

ozitronics servo kit

K1001 is an 8-Channel Serial Servo Controller based on the Atmel 89C2051 microcontroller. It accepts RS232 or TTL serial data from a computer or microcontroller and outputs PWM (pulse width modulated) signals to control up to eight RC servo motors (as used in radio-controlled model airplanes, cars, etc.). Unused servo pins can be reconfigured for digital output to drive on/off devices.

Up to four controllers can be multi-dropped on a single serial port for controlling up to 32 servo motors – more on request.

Reuse Wireless Keyboard and Mouse

Many people give up on Wireless Keyboard Mouse Combo after a few months of “Novelty”. This is due to the chore of replacing batteries and also the cost and wastage (carbon foot).

Then i have long been suggesting, nineties, ferrite smps coupled charger docks. This is like RFID, but more like RF power transfer. One half of Ferrite E-Core is in the Gadget and the other half is in the Dock. When the Gadget is docked it is sensed and power transfer just like in SMPS. Rechargeable batteries in the gadget.

How-To Convert Wireless to Pseudo-Wired

Wired Wireless Keyboard Mouse Combo  -Here is the Schoodle for building this. The Mumbo Jumbo to make a Wired-Wireless Combo is below.

Wired Wireless Keyobard Mouse

Now you got a Wireless Combo, it can be converted into wired yet wireless, it is simple the wires will now carry 3V power to the Keyboard and Mouse, so no batteries. A little gentle and smart drilling is needed for the Mouse.

Get a 5V Adapter, the ones used for charging phones and music players. If you cannot get 5V use a 7805 to derive a 5V from 6 or 9. Use two 1N4007 in series on the positive line to drop 1.5V – test out with a dummy load of 10K and 100uF cap. Now use this to power both the mouse and keyboard with thin dual-core wires leading to the battery terminals. Soldering this may be a delicate job. Now you got a Perpetual Wired Keyboard Mouse Combo. The Interface still remains Wireless.

Another way is use Rechargeable Batteries for both. The wires will carry exactly a regulated 3.3V from a LM317 circuit which can be tweaked. The Mains adapter can be any 6V or 9V raw DC. You can have a Connector for the power wires when you want it to be wire free. This may require greater Gadget Opening and Drilling Expertise.

Reuse – Be Earth Friendly – Keep your Carbon Footprint smaller than that of a Yeti.

Velleman – Kits Tools and Equipment

“VELLEMAN nv has been a major distributor of electronics for more than 35 years. Our warehouses contain over 18,000 different products from 50 brands.”

Velleman – Kits Tools and Equipment

  • Velleman kits & oscilloscopes
  • Transformers, coils & motors
  • Semiconductors & sensors
  • Passive components
  • Batteries & chargers
  • Adapters & power supplies
  • Enclosures

They have the Test bench tools, parts and also all the prototyping materials.

A Velleman Power Supply for the Test bench

A Velleman Power Supply for the Test bench

Velleman Inc. 7354 Tower Street, Fort Worth, Texas 76118

Powered USB Hub Help PC Interface

I got a strange problem as i added more and more peripherals, the pc gave odd messages, “i cannot detect what you are doing” and things like that. I almost flipped trying to locate the culprit. The problem was not in any peripheral but in the USB port powering the system itself. The SMPS was not loading much. Certainly the peripherals were drawing more and the warning could have been more like “use your own power”.  Computer Data Interface

Powered USB Hub Help PC Interface

I could not locate a powered USB with any vendor close by, so i built one and it works perfectly, Now it doubles up as a UPS Low Batter Indicator, by rare coincidence. If the Unregulated DC is above 7 volts, then no bugs. When i adjust the unregulated DC to the 7805 to around 6.9V, then i have a advance warning system.

Wireless USB – Wireless Extension to USB

USB Hub with Power

When power fails, i keep working and listening to music from a Flash Thumb drive. When music stops, i turn of computer, the lead acid batteries gone below 20 V DC. This avoids deep discharge of my batteries. The Powered USB gets undetected when the supply falls below 4.5 probably.

Charger for Portable Devices

This is a simple charger you can build for devices. It can be modified for any device. This may need no modification for devices that are charged using PC USB port.

Power Electronic Circuits

Charger for Portable Devices

This is a Schematic Doodle called Schoodle. Use it for Learning and understanding. Build and test only when you have practiced and gone beyond simple electrical and electronic circuits. Mistakes can damage your portable device or even waste your components. Hence take care, work systematically, not like me. See the mess i have created below.