Hobby Circuits – Bill Bowden

Bill Bowden’s Circuits is one of the oldest Web Reference, it was hosted by CompuServe homepages and later moved to his own domain website.

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.

Hobby Circuits - Bill Bowden

Most of the circuits can be built with common components available from Radio Shack or salvaged from scrap electronic equipment…….

Hobby Circuits – Bill Bowden

Some of the Highlights in this website

  • 32.768 KHz Oscillator Using A Common Watch Crystal
  • 40 LED Bicycle Light (555 Timer – 6 volt)
  • Descrete LED fading circuit using 5 transistors
  • Mechanical Wall Clock Quartz Synchronizer
  • Neodymium Magnet Single Pole Motor
  • Variable Voltage and Current Power Supply
  • Micro Power AM Broadcast Transmitter

Macro photography – Close-up Photography

I saw some photos of products, some images were good, some focus lost, few of them dim. Even i had lot of trouble with photographing objects. So here is a collection of resources to improve this skill of Indoor Macro photography.

Macro photography  is extreme close-up photography, usually of very small subjects and living organisms like insects. Electronic Product Photography is a Branch of commercial photography and similar in most respects to food photography.

 food and product photography

Macro photography

Apart from technical photography and film-based processes, where the size of the image on the negative or image sensor is the subject of discussion, the finished print or on-screen image more commonly lends a photograph its macro status.

“Macro” lenses specifically designed for close-up work, with a long barrel for close focusing and optimized for high reproduction ratios, are one of the most common tools for macro photography. (Unlike most other lens makers,

Plonsky – Macrophotography Article

“….see the bug in more detail than we could in real life. That is what got me started and what I enjoy so much about macros. They let you see what you ordinarily cannot. As a scientist, I am quite curious by nature…”

High Speed Photography – HSP

Here is a small list of photography related circuit and projects including High Speed Photography or HSP that uses Electronic Circuits to operate the Trigger or Lens Shutter.

High Speed Photography

“Many physical processes evolve on timescales shorter than the human eye can resolve. Effectively, this means the details of how the process changes with time are lost in a blur. High speed photography, or HSP, is simply photography with extremely short exposure times,….

High Speed Photography - HSP

….All control systems can be classified into one of two broad types – Open Loop and Closed Loop. The difference between them is the use of feedback via input signal. For the DIY high speed photographer, the difference equates to reliability, expense and simple electronics. ”

Lightning Activated Camera Shutter Trigger

This circuit is used to trigger a camera’s electronic shutter circuit when a flash of lightning is present. This circuit would also work for photographing fireworks displays or other events involving flashes of light.

Darkroom Camera Shutter Timer

This circuit was designed to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0.35 seconds to 4 seconds

Motorized Video Camera Mount

This article describes a motorized, waterproof mount for a miniature video camera. If a suitable waterproof camera is used, this unit can be used outdoors.