Friday, August 28, 2009

Transistors Tutorial

Here is lots of great info on transistors. If you want an in depth look into transitors this tutorial is a must read. Click here to read the entire tutorial.

Monday, August 17, 2009

Electronic Toy Organ

Check out our latest project an electronic toy organ. click here to see the schematic and the parts list at our website on the project page. Hope you enjoy and build one for yourself, my kids really enjoy playing with this toy.

Thursday, August 13, 2009

August 2009 Nuts and Volts Magazine

I really like this magazine every month it contains lots of good information on electronics and cool project ideas. This month in the article "Properly Selecting Electronic Components, part 2" there was a lot of good information on components, tools and good electronic theory info including formulas for construction of your own capacitors and inductor's, plus other classic electronic formulas and facts. This is a really good magazine that everyone can enjoy and learn from.Thanks Nuts and Volt's and I hope you continue to put out awesome magazines every month for years to come. Click here to find out more about this great magazine or click on the photo below.

Tuesday, August 11, 2009

Updated Tools And Tips Page

The Preher-Tech tools and tips page has recently been updated and lots of new info has been added and we will be adding a lot more shortly. Click here to go to the tools and tips page now and start reading all the recently added articles. All this info is specially picked out for those in the electronics repair field or those just wanting to learn more about electronic theory. Enjoy.


This is an important topic, all good technicians not only need to know what a transformer is and what they look like but also need to understand the theory behind how they work. It is also good to understand the different types of construction and there applications. There is a lot more to transformers than you may realize.

A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors — the transformer's coils. A varying current in the first or primary winding creates a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF) or "voltage" in the "secondary" winding. This effect is called mutual induction.
If a load is connected to the secondary, an electric current will flow in the secondary winding and electrical energy will be transferred from the primary circuit through the transformer to the load. In an ideal transformer, the induced voltage in the secondary winding (VS) is in proportion to the primary voltage (VP), and is given by the ratio of the number of turns in the secondary (NS) to the number of turns in the primary (NP). To read more click here and here.

Wednesday, August 5, 2009

News Letter Delay

Just wanted to inform all my news letter subscribers that this months news letter is delayed until the 14th. I apologize but repair work has been very good , I keep getting influxes of LCD repairs. I want to make sure my book is ready before releasing the news letter and did not have enough time to finish the book yet. Thanks for understanding. I will be updating the Blog with lots of good info until then though so stay tuned.

Tuesday, August 4, 2009

New ESR Meter

Here is the ESR-micro v3.1 I had told you was being sent to me in a past blog. Well it is here now and I have done a review on my website.To see the review click here or click on the photo below. I have to say I really love this meter as it is so small, well made and also it checks capacitance and has a large range too 1uF-60mF(60,000uF). This meter will be getting a lot of use from me and we will see how it stands the test of time.