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Sensor, Detectector, Data Logger, Monitor and Measuring Instrument schematics

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Infra-red Level Detector

Infra-red Level Detector

This circuit is useful in liquids level or proximity detection. It operates detecting the distance from the target by reflection of an infrared beam. It can safely detect the level of a liquid in a tank without any contact with the liquid itself.

http://www.redcircuits.com/Page41.htm

Room Noise Detector

Room Noise Detector

This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 and 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked up by a miniature electret microphone to drive a LED.

http://www.redcircuits.com/Page16.htm

Fleapower circuit detects short circuits

Fleapower circuit detects short circuits

These analog supply rails can drive precision op amps, such as the MAX400 and OP-07, whose input common-mode-rejection and output-range specifications are 2 to 3V within the supply rails. Thus, the rails are good enough if the -5V output is less than -3V and the 10V output is more than 8V.

http://www.edn.com/archives/1998/070298/14di.htm

Chronograph

Chronograph

The chronograph works in the normal way, by timing how long it takes a projectile to break two infrared beams spaced 3 inches apart in the tube. The spacing is critical as any offset will result in a measurement error. The minimum measurable projectile speed is approximately 38.1 ft/sec.

http://www.geocities.com/pest3125/chrono/chrono.htm

Tilt Sensor

Tilt Sensor

http://members.home.nl/b.vandam/lonely/pagina51.html

Basic Missing Pulse Detector

Basic Missing Pulse Detector

http://www.uoguelph.ca/~antoon/circ/mispulse.htm

Measuring method of SMA Relays

Measuring method of SMA Relays

With network-analyser you can measure only up to 6 GHz. For higher frequencies you have to use generator and power-meter. This article describes how does the author measure such relays available from various manufacturer such as Narda

http://df2ck.de/tech/smarelay

Measuring mutual conductance of FET

Measuring mutual conductance of FET

http://images.electronicsinfoline.com/View/Photo/10001/thumb_a02007.gif

Measuring on 76 Ghz SHF-mixer

Measuring on 76 Ghz SHF-mixer

for spectrum analyser

http://www.mrs.bt.co.uk/dubus/9202-2.pdf

Measuring resistance and current

Measuring resistance and current

with a nonelectric VOM

http://www.tpub.com/neets/book16/69.htm


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