Hobby Projects - Insulation tester, LED Circuits, Meters.

Tuesday, March 29, 2011

Electronic Inventory Online - Parts-n-Kits

High quality new & excess electronic components, such as: Batteries, LCD's, LED's, Power Supplies, Switches, Fans, Cables, Development Tools and more.

Lumileds LXHL-MWGC Luxeon I 1 Watt Warm White
Electronic Inventory Online - Parts-n-Kits

eio is a versatile electronics surplus source associating information with the distribution of electronics, computer and optical materials. They have very good bargains in some categories.

Lumileds LXHL-MWGC Luxeon

LED Lighting, One Watt of Warm White light. 20 lumens at a Wavelength of 3300 K.

Shop at Electronic Inventory Online

Electronic Inventory Online, Inc.
22412 Normandie Ave. Unit #A Torrance, CA 90502 (USA)

delabs Notes

A Warm White LED is great Feng Shui for a Hobbyist's Desktop or Workshop. A DIY Table Lamp or a Lathe Lamp with these Warm LEDs create Positive Energy, for not just your Home but for the Entire Neighborhood. This idea, is in the form of riddles in Ancient Chinese Manuscripts, I hope the Yellow Emperor does not see this post.

Yellow Emperor - Known as an early inventor. He holds the patents for The South Pointing Chariot, Diadem, Football, Silks, Dyes and Grain Farming too. A Musical instrument called Guqin too!

Electronic Surplus - Obsolete Rare Components

They are Experts with hard to find electronic parts from audio ICs and devices, to transformers and relays. An inventory that is made up of obsolete and active items.

Electronic Surplus - Obsolete Rare Components

Surplus Electronics: Switches, Capacitors, Transformers, Connectors, Motors, Meters & Analog Indicators, Semiconductors and More.

Sell or Dispose your stagnant inventories or unused items to Electronic Surplus. This is a Green Solution, Recycle, it also helps small entrepreneurs do something new. Remember old parts may corrode and get infested if idle for long. Electrolytics and Batteries do not have a good shelf life.

Electronic Surplus - Obsolete Rare Components

"E.S.I. was started by Clyde Daniels back before 1930 when he was selling all types of material he then progressed to Military surplus after World War 2 when his son Dick joined him after serving on PT boats in the Navy and Dick mother Ida Maye completed the family operation."

Electronic Surplus Inc
8755 Munson Road #6, MENTOR, OH 44060

Monday, March 28, 2011

Electronix Express - For Schools and Industry

Distributor of electronic components, test equipment and tools. Custom electronics kitting and value-added services.

Electronix Express - For Schools and Industry

Some of the products they supply include Anti Static Products, Toolkits, Soldering related, Inductors, Logic Probes and Pulsers.

A Benchtop Multimeter,  4 ¾ digit, 40,000 count true RMS AC with Built-in USB & RS232 Interfaces.

Bench Digital Multimeter DM422B

Bench Digital Multimeter DM422B

Other features -• Data save and recall with software, Triple display, (main, sub-left, sub-right), 40 segment bar graph display, duty cycle, Temperature function.....

True RMS, USB & RS232 Model

Electronix Express
900 Hart Street Rahway, NJ 07065, USA

All Electronics - Pre-owned or New Parts and Equipment

This is a easy to use Electronics Component eStore. And so well sorted and Boxed. They also buy unused Inventory or surplus from You. They specialize in electronic and electro-mechanical parts and assemblies.All Electronics - Pre-owned or New Parts and Equipment

All Electronics - Pre-owned or New Parts and Equipment

From robotics, electric trains, surveillance, remote control models, antique radio restoration to Used Parts and Assembly; They have it all for the student, hobbyist or even that rare Inventor. Since 1967 they have this service, nearly a year after i was born. They are as old as Me.

All Electronics Corporation
14928 Oxnard Street, CA 91411-2611, USA

Saturday, March 26, 2011

LM3914 - Versatile and Easy use Display

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V.

LM3914 - Versatile and Easy use Display
  • Drives LEDs, LCDs or vacuum fluorescents
  • Bar or dot display mode externally selectable by user
  • Expandable to displays of 100 steps
  • Internal voltage reference from 1.2V to 12V
  • Operates with single supply of less than 3V
  • LED driver outputs are current regulated, open-collectors
The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V-, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to ½%, even over a wide temperature range.

My LM3914 Circuits

Millivolt Meter using a LM3914 LED Dot Display
Millivolt Meter using a LM3914 LED Dot Display
Circuits and Projects of LM3914


LM2941 Manual Fan Regulator & LM3914 Voltage Monitor - The LM3914 voltage monitor is also straight forward. As told I use only 6 of the 10 led outputs. A voltage divider on the input (R1-R2) decreases the 7-12V input to about 1.96-3.36V (x0.28). 

Novel white LED torch - LED bargraph readouts, here the LM3914 is used as the basis of a 10-step variable brightness current-regulated white LED torch!

Indikátor napětí autobaterie s LM3914 - This is actually a voltmeter that the size of the measured voltage signals using ten LEDs. The level of which will illuminate the first LED and the lights can be set to last.

Bauplan Schaltplan Bargraph Anzeige mit dem LM3914 - Analog displays have the undoubted advantage that you can get a reading very quickly perceives visually compared to digital displays.

Stereo Digital Camera Sync Shepherd - R7 sets the current through the LED's of the display. With R7 of 620 ohms, the illuminated display LED draws about 20 mA, which is about maximum for this display,

DIS*PLAYER: Theory and Construction -  This device drives ten LEDs in a linear display, with programmable endpoints and the choice of "dot" or "bar" modes of operation. Furthermore, it is possible to "chain" multiple devices for displays of virtually unlimited size. 

Thursday, March 24, 2011

Wireless Home Power Monitor - Tweet-a-Watt

This is an Embedded Project using a XBee. Makes an Energy/Watt/Power Meter into a Wireless Intelligent Sensor.

These Sensors are Interfaced to a PC using another XBee. The Data Acquired can be Displayed(monitor), Logged (sql/csv) and Analyzed (graphs/reports). Then you can form a set of Green Resolutions and Implement them.

Tweet-a-Watt! A safe and simple wireless power monitor

Tweet-a-Watt! A safe and simple wireless power monitor

Tweet-a-Watt starter pack

Monitor upto 1.5 KW, You have to own a Kill-A-Watt device to Add-On this Kit to Web Enable it. Each plug transmits the power usage at that outlet to a central computer receiver. The receiver can then log, graph and report the data.

OscilloScopes for the DIY Enthusiast

Here are some Hobby Scopes that might even be quite professional if you develop them further. They are virtual instruments. Making Scopes with tablets may be much more easy now.

The µSCOPE - A poorman's oscilloscope
The oscilloscope is still one of the most important measurement tools of the electronic engineer. With the advent of the often very reasonably priced USB scopes, such an instrument is now within reach of every body.

OscilloScopes for the DIY Enthusiast

Digital oscilloscope - Build a simple Inexpensive digital oscilloscope. Single channel, about 100 MSPS. RS-232 based.

xoscope is a digital oscilloscope using input from a sound card orEsounD and/or a ProbeScope/osziFOX and will soon support Bitscopehardware. Includes 8 signal displays, variable time scale, math,memory, measurements, and file save/load.

xoscope - digital oscilloscope for Linux

MHZ100Q is a low cost FPGA-based high speed data acquisition system. Version 2 is a standalone board containing 2, 100MHz 8-bit A/D channels, preamp, 7th order elliptical antialiasing filters, and a Xilinx FPGA.

MHZ100Q - Open Source FPGA-based 100MHz A/D

A USB interface is implemented in the FPGA firmware. Power comes from the USB bus. Schematics, VHDL and Verilog source code, and signal capture and display software are available and being posted.