Hobby Projects - Insulation tester, LED Circuits, Meters.

Sunday, October 27, 2013

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.

Friday, October 25, 2013

PJRC - Embedded Electronic Projects

PJRC Electronic Embedded Systems Projects with parts  Paul and Robin's Home offers free technical design data and detailed instructions for building them. Useful for Education. .

PJRC - Embedded Electronic Projects

The Teensy is a complete USB-based microcontroller development system, in a very small footprint, capable of implementing many types of projects. All programming is done via the USB port..

Teensy USB Development Board

Version 3.6 features a 32 bit 180 MHz ARM Cortex-M4 processor with floating point unit. All digital and analog pins are 3.3 volts. Do not apply more than 3.3V to any signal pin.

Teensy USB Development Board

8051 Tools,  8051 Development Circuit Board, PAULMON2 Monitor Program, AS31 Assembler & SDCC C Compiler, Code Library.

8051 Resources And Projects

delabs Notes -

What better way to learn the uC, than by Building your own Musical Instrument or Music Player. More Motivation than you can ask for.

Thursday, October 17, 2013

LM317 based Regulated Power Supply

This is a Regulated Power Supply based on the LM317 IC. It will need a Boost Power Transistor and heatsink for higher currents. It is a versatile building block for stable instrumentation supplies. Consumer Electronic gadgets can use a SMPS chip. In case you wish to use a SMPS for a Precision Instrumentation Block, then take extreme care on Shielding and EMI-RFI.

LM317 based Regulated Power Supply

This is a General Purpose Chip, Series Regulation. It can be varied or trimmed. There is an Internal temperature compensated reference. The minimum trim value is around 1.2. In case you want a Low value voltage like 0.5 with a good current, then use a good negative supply to offset the 1.2 V.

The transformer can be s Split Bobbin with Pri-Sec copper shield foil.  This can be earthed along with the metal enclosure. C4 sends any hi-freq components to earth.  It is better if you do not earth the ground but use such capacitors. A Supply should simulate a a battery with both ends floating wrt Earth. A option to eartth the ground is fine. This also helps the user to configure his own dual supplies.

Q1 and R5 form a Short Circuit OR current fold back OR constant current mechanism. TP1 can be used to vary the output voltage.  Better use something like a Bourns 10T trimpot. An open preset may introduce a noise due to dust and vibration. I don’t remember why i added a zener DZ1, a diode may suffice.

See more at my Power Supplies Section.

Wednesday, October 09, 2013

Battery Monitor for your Boat or Car

This is a colorful, useful and educative project from Erlich Industrial Development, Corp. You will learn using Op-Amps as comparators and also LED bar graph analog display.

Battery Monitor for your Boat or Car

Voltage Monitoring is an Electronics board that allows you to connect 5 to 14VDC on one side of the board and get it corresponding LEDs light on the other side. Every Car, tractor or boat should have one.

Battery Monitor for your Boat or Car

The boards will allow you to easily monitor your 12V battery while powering from the same battery. The Terminal Block TB connector is included and makes it easy to use.

delabs notes

The LM324 is the Heart or Intelligence in this Circuit. There is a voltage divider and zener too. They have a kit and pcb to buy and build .

Important

A battery of a car can drive enormous amount of current, anything that is High-Voltage, High-Current or High-Frequency or a combination of these; are known to be high energy circuits. So as a precaution when you wire the positive to the car battery use an automobile fuse with holder like the one used outside the stereo player. The fuse has to be outside!

You could also use a fusible resistor in a metal box and keep it outside, the 12V positive has to go thru this. Any car/boat project needs this. A short circuit on PCB or Wire will blow fuse and everybody is safe.

Got it ..

Sunday, October 06, 2013

The Radio Electronics Magazine

Radio-Electronics was an American electronics magazine that was published under various titles from 1929 to 2003.You can Read them all here .

Radio Electronics Magazine at The Internet Archive

Recently i found a collection of those mags at Archive.org .....

Radio Electronics Magazine at Archive.org

Hugo Gernsback, sometimes called The Father of Science Fiction, started it as Radio-Craft in July 1929. The title was changed to Radio-Electronics in October 1948 and again to Electronics Now in July 1992. In January 2000 it was merged with Gernsback's Popular Electronics to become Poptronics.

Radio Electronics Magazine at SWTPC
Gernsback Publications ceased operations in December 2002 and the January 2003 issue was the last.

Over the years, Radio-Electronics featured audio, radio, television and computer technology. The most notable articles were the TV Typewriter (September 1973)[1] and the Mark-8 computer (July 1974). These two issues are considered milestones in the home computer revolution.

Radio Electronics Magazine at SWTPC

Radio-Electronics was aimed at electronics' professionals such as radio and TV repairmen. And they were men, the tag line on the cover was "For Men with Ideas in Electronics".