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Practical Electronics Learning with DIY. Practical Experiments forge the book, college or web learning into a Skill.

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Saturday, May 21, 2011

Step Down Capacitor - No Heat

Sometime in the eighties, I had to change a blind timer design due to non-availability of a component. A high resistance relay 600 ohm coil was not in supply, 150E was available. The Power to timer was derived from a resistor, I put a 0.47uF 630V and it Worked !. This design of mine, deriving a low voltage from a capacitor shown on right adaptation became popular. I used a 0.47uF 440V AC or 630V DC Plastic Capacitor.

Schematics of delabs: Mains Voltage Indicator

This circuit has been drawn from my memory and i have not tried it out again, just see if it is ok and then try. You should use the fuse of 100mA a slow blow if you want but it is very important. This circuit has to be enclosed in a plastic sealed enclosure to avoid contact.

Mains Voltage Indicator with a LED

Mains Voltage LED Indicator

Mains Current Indicator with a LED

You should use the fuse of 1A a slow blow if you want but it is very important. You can design the shunt R3 and Fuse rating as required by your load. Note that this circuit is to be put in series with the load like an ammeter. If you put it across the supply like a voltmeter it will fuse out or burn out. This circuit has to be enclosed in a plastic sealed enclosure to avoid contact.

Mains Current LED Indicator

Friday, May 20, 2011

Schematic to Reality a nice Perspective

Without Audiophiles and Ham-Radio enthusiasts, the field of Electronics would be Dreary and Gloomy.

From Schematic to Reality

Here is a nice page with refreshing illustrations, this page helps initiate a Electronics Newbie in the complex science of Schematic Reading.

Phantom Power and Microphone Interconnect Basics

Phantom Power and Microphone Interconnect Basics

What's that you say? You don't know your AC from your DC' Audio is considered an Alternating Current, a.k.a. "AC." (So is 120-volt "wall" power.) But electronic circuits need Direct Current (DC) to turn them on, from batteries or power supplies.

The Electric Web Matrix

DIY Pages and Know-How for those who love vacuum tubes, computers, and hearing music in its pristine form. There is an Audio and Electronics section is for the DIY computer audiophile.

My Notes - Even though i had Electronics Junk in my lab, when i was at school. (I used to call it Nuts-n-Bolts) The first project i saw being built by a friend was a Guitar Pickup using Germanium Transistors/Diodes. This was my first semiconductor schematic reading. Get into electronics now with a Audio Project, or ....

Wednesday, May 18, 2011

Alternative Energy Projects - MTM Scientific

Here are some neat projects for your study, free learning material. Solar Oven Cooker, Anemometer Circuit, Simple Data Logger.

Hand Cranked DC Generator Plans
The MTM Scientific, Inc. Experimenter Corner

Highlights are How to Measure the Power Output of Solar Panels and the Time Controlled Relay Switching Kit.

They also sell a Battery Amp Hour Meter and a Crystal Diode set which contains 1N34A diodes, 1N60 and D9B for learning electronics. They are Germanium Diodes.

An interesting Energy solution is the Hand Cranked DC Generator Plans. It describes how to build a hand operated electric power generator using a standard DC gearhead motor.

Solar Tracker Circuit Kits helps you servo position your Solar Cell Array, you can build a device which will automatically follow the sun across the sky.

Alternate Energy Plans by Lee Bell

At the PackRat WorkShop Lee Bell has archived Power-Energy Ideas, Mechanical Howto and Robot Designs too. A Practical Man, His drawings are a language by itself. He has created a useful resource which will keep a DIY Enthusiast busy for many months.

Alternate Energy Plans by Lee Bell

"I already had a marine deep cycle type battery and an alternator that someone had traded me a while back in exchange for a 1hp dc treadmill motor. He was building a windmill and the car alt needed too many rpm's for what he wanted to do. I think it's a standard GM type." - Lee Bell

Alternate Energy Plans by Lee Bell

delabs Notes

Alternate Energy, storing and managing your own small power source, are an invaluable asset for Home or Small Business.

Depending on oneself, not only develops skills but also keeps you in form always. Building an energy source cost-effectively, requires you to put in a lot of learning and building efforts.That itself may become your future Small Business

Remember Fossil Fuels are Running out fast, Only Internet Communications and Alternative Energy will keep Business Blooming.

The lifestyle has to change, The future Generations are going to face the Heat, or is it Bitter Cold ! Even Freezing ?

Coal and Steel with Steam brought about the First Industrial Boom. Then Oil created unprecedented Magic, the Second Technological Revolution. This will not last long. If only Rover found Oil in Mars, this post was not needed.