Monday, May 01, 2017
Mikes Optical Timer Counter
Once built, this counter timer/device is easily adapted to a wide variety of applications, simply by construction of a new sensor. Although designed to be used with photo-transistors, this device can also use relays, transistors and many other kinds of electrical switches as a sensor.
Model Railroading, 3 Transistor Audio Preamp for a Dynamic Microphone
Configuration and control of this counter/timer is through a RS232 port. Cable configuration for a usual PC compatible would consist of a null modem cable, with a female connector on the timer/counter end of the cable. The correct cable for a PC or usb to serial adapter with a DB-9 interface is listed in the bill of materials.
Monday, July 11, 2016
Electronic Hobby Projects - Chemelec
Some projects that may ring bells in your DIY Brain
- A 10 Watt RMS Amplifier
- A Solar or Wind Charger/Dump Circuit
- A Cat or Dog Detector
- Inverter, 12 volt unit, Mos-Fet design
- A 25 LED Chaser". (Sequencer)
- A Metal Detector, for Pin Pointing.
- Watt Meter", Measures True RMS Watts
- Pulse Induction Metal Detector
A Mos-Fet Power Inverter
This circuit will provide a very stable "Square Wave" Output Voltage. Output Frequency is Adjustable and Stable. Can be used to deliver a wide range of output voltages by using appropriate turns ratio. Additional MosFets can be paralleled for higher power.
Wednesday, October 22, 2014
Schematics, Hobby Projects, Tesla, Marconi, 555, Metal Detecting, Electronics-Tutorials and a lot more..
Circuit Land - Tony Van Roon
- Morse Code Practice Keyer,
- Constant Current Charger
- Touch Activated Alarm System
- Miniature FM Transmitter
- Continuity Tester, Smart
Monday, October 20, 2014
Sam Electronic Circuits
There is a huge collection of Valve or Vacuum Tube Power Amplifier circuits. Even Hi-Fi Preamplifiers based on these tubes. Power Supplies and Test Instruments you could build to power-up your Hobby Bench at low cost.
He has circuits for the Automobile and battery as well. Clock and Timer circuits for Home Automation. VU Meters and Graphic Equalizers to make your Audio dream project.
When i came online in the late nineties, i discovered Sam and other sites having many circuits and ideas. Ham radio folk were also in good numbers. That was an Innocent and Informative Web, it was heaven.
Thursday, September 11, 2014
This was one of the Mags along with Radio Electronics that made me a better designer. Radio Electronics was my first favorite mag.
Elektor Electronics - EE Circuits Projects
They also have some of the issues for download. Some nice projects too are available with code for reference and experimenting.
Online Store and Members Area
They have a Forum for Discussion and Displaying your Completed projects. Even seek help when stuck with your project.
Then a Kits and Tools Store where you can buy the things you need to make the Electronic Projects, ..
I though it was time i made a collage for my old guru, then even i am getting older. I wish there was an Internet when i was young. Time to use my rusting Time Machine, Bye... delabs
Updated Sept 2014
Thursday, July 10, 2014
Electronique - Sonelec-Musique
This topic is for beginners, and explains very briefly what are the most common electronic component. Réalisations - DIY (Do It Yourself, faites-le vous-même). Compilations de montages de mon cru, ou explications et conseils pour des montages d'autres auteurs.
Electronics - Achievements - Selector 001c
This circuit includes a microcontroller PIC 16F84A type (deprecated) or 16F628A (recommended), and can control one or more devices from eight through some pushbuttons. Each push button corresponds to a separate output, and Pressing either of these buttons activates the corresponding output.
Here he has made a Sculpture with Resistors and Copper Wire Strands and then Solder (Lead Free)
"Drawing used model, designed by Flavie. few overviews and detail. 's eye is made with a ceramic disc capacitor of 1.5 pF. The shoes are made with four small rectangular capacitors of 1.5 pF. For the mane, forelock and tail, I used strands of copper wire. Wire has just been stripped and the copper is still pink. I hesitate to put varnish for protégrer corrosion."
From Hobby Hound - DIY Electronics
( oeuvre d'art - delabs) - Sculptures - Elec - Cheval 001
Wednesday, May 28, 2014
Nuts and Volts DIY Magazine
Nuts & Volts is written for the hands-on hobbyist, design engineer, technician, and experimenter. The diversity of subjects appeals to all levels of experience and spans such topics as amateur robotics, circuit design, lasers, computer control, home automation, microcontrollers, data acquisition, new technology, DIY projects, electronic theory, and more, not to mention the popular BASIC Stamp.
Adding More Digital I/O to your 16-Bit Experimenter Kit
If you’ve been following the 16-Bit Micro Experimenter series in Nuts & Volts, you are already familiar with its solderless breadboard environment and the fully programmable 10 line I/O expansion bus that comes with the kit. The 10 lines can be assigned to be digital, analog or even connected to any of the PIC24F Microcontroller’s internal extensive peripheral set (i.e. dual UART, five CCP modules, ADC, Real time Clock Calendar, dual SPI, and dual I2C).
The Mini-Bench Supply
A small power supply with +5V, +12V, and -12V outputs is a handy thing to have around when you’re breadboarding circuits with both op-amps and digital ICs. You would want a switching regulator for efficiency, but linear regulators for low noise. Plus, it should be easy to build and relatively inexpensive.
Sunday, October 06, 2013
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.
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) 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".
Thursday, September 26, 2013
Read Humidity and Temperature on PC
A High humidity like 90% is seen after a Rainfall, A low Humidity like 25% means dry days. A humidity of around 50% is healthy, above that Bugs and Fungus trouble. Less that 40% cause skin and breathing irritations. 60% is comfortable for us and most equipment. High humidity can cause trouble to unprotected electronics.
This device has a serial interface, that means you could use a Serial to USB circuit and even interface with your Android tablet.
"This is an assembled unit which interfaces with a PC COM port and provides the capability of measuring the relative humidity and temperature using a Sensirion SHT-71 sensor. It includes an assembled printed circuit board, a 12 VDC wall power unit, and a six foot serial cable (DB9) . The unit interfaces with a COM port or similar at 9600 baud. (A USB to RS232 converter may be used)."
SHT71 - Digital Humidity and Temperature Sensor
Replaceable relative humidity sensor, The internal calibration allows for simple and easy replacement in demanding environments. The capacitive humidity sensor SHT71 is fully calibrated and provides a digital output.
Tuesday, August 07, 2007
Two versions of a dual polarity power supply with printed circuit board artwork. The supplies are built around the popular LM317 & 337 complementary voltage regulators which offer very high ripple rejection as well as short-circuit and thermal protection.
A battery-powered microphone preamplifier and microphone wand for acoustic tests and recording. The preamplifier features 20dB of switchable gain and a clipping indicator,
Jason Neals DIY Audio and Electronics
An interesting website with many photos of electronic projects. There are not many projects but the description and photos and documentation are very useful for learning the art of circuit design.
Wednesday, July 11, 2007
Electronic circuits (schematics) & do-it-yourself (DIY) circuit diagrams, for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few.
There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories. You can view the entire electronic circuit schematics
Tuesday, June 05, 2007
Sunday, April 01, 2007
Electronics Lab - Electronic Hobby Projects
Here you can find useful circuits with full description, diagrams and PCB, electronics articles, links and downloads. The electronic hobbyist corner, projects, kits, schematics, pcb, free electronic software and electronic community.
Hobby Circuits - Bill Bowden
A small collection of electronic circuits for the hobbyist or student. Site includes over 100 circuit diagrams, links to related sites, commercial kits and projects, newsgroups and educational areas. Most of the circuits can be built with common components available from Radio Shack or salvaged from scrap electronic equipment.......