The Hobby Corner
Updated on:  Friday, December 18, 2015 08:20 AM


  The Hobby Corner:
- Electronic Tips
- Hobby Circuits
- Electronic Field Disturbance Monitor
- 100+ Construction Project Ideas

 The Design Corner
The Hobby Corner
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Capacitance Proximity Switch Technology      --      Commercial Capacitance Proximity Switch  (Faraday Switches)

Hobby Corner - Circuits designed by
David A. Johnson, P.E.

Some people collect stamps, coins or baseball cards, I collect electronic circuit schematics. I own several book shelves and file cabinets full of electronic circuit books, IC application manuals and circuit encyclopedias.  I often use my collection for reference. During a career that has spanned nearly 30 years I must have personally designed several thousand circuits. A few circuits I had published in several magazines.

Hobby Circuits (now on is a collection of  electronic circuits I think you will find interesting.  I am reviewing my collection, of  thousands of circuits.  I will continue to add some of the best in my collection and will also add some of  my circuits that have been published in various magazines.  Let me know if you find any of these useful.  g

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