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This digital tachometer was made from a Maplins electronics kit. |
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The display unit only had 2 digits and the ordinary design displayed the output in hundreds and thousands of revolutions. The times 10 converter disc was simply a disc with 10 light/dark contrast areas to give 10 pulses per revolution. This made the display show tens and hundreds of revolutions instead. The signal indicator was an additional green LED which flashed for each pulse received from the transducer. It was designed to be used to set the equipment up. |
The system components. |
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The sensor was an infra-red transceiver/receiver which was mounted on a magnetic base with an adjustable mounting angle. Here is the schematic for the display unit. (Click for larger image (237KBytes)) |
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Here is the rev-counter in action. The x10 converter was used with the Stirling engine to test the tachometer.This image shows the engine running at about 310 revs/minute. (Sorry for the poor image but the camera flash made the display unit unreadable). |
Tachometer working |
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