8 Photo-Detector Circuitboards

Visible and Infrared Light

There are two versions of the "8 Photo-Detector" circuitboard. Circuitboards and parts are available for both versions of this circuit.

The new circuitboard is looks the same as the original when viewed from the component side of the board.

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The original photo-detector circuitboard where the Outputs Are LOW When The Inputs Are HIGH.

The LEDs are ON when the Phototransistors are dark.

Click Here For The Original 8 Photo-Detector Circuitboard Page

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A new version of the 8 Photo-Detector circuitboard where the Outputs Are LOW When The Inputs Are LOW.

(The LEDs are ON when the Phototransistors are exposed to light.)

Click Here For The New 8 Photo-Detector Circuitboard Page

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Please Read Before Using These Circuit Ideas

The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.

If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.

Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.