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Dave's Transimpedance Amplifiers:
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LASER/LED LIGHT OUTPUT INTENSITY METER
This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance
amplifier to measure the light power output of infrared and visible LEDs and
laser diodes. It can be modified to produce almost any milliwatts to volts scale
factor. It can be connected to either a multi-meter or an oscilloscope.
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LIGHT RECEIVER WORKS FROM 1KHz TO OVER 70MHz
This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver
with a very fast response. It is designed around a PIN photo diode that is
packaged for use with plastic optical fibers. It can be used as an optical fiber
receiver. By using the open end of the optical fiber it can "sniff" out any
modulated light signals.
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OPTICAL RFID TEST CIRCUIT
I designed this test the concept of using light techniques to send
identification data instead of RF. A more detailed discussion on this scheme can
be found in the Imagineered new products section.
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SINGLE IC FORMS SENSITIVE MODULATED LIGHT RECEIVER
The circuit uses a very inexpensive C-MOS IC that is connected to a small
photodiode. Using a unique inductive feedback network, the circuit provides high
sensitivity under high ambient light conditions. It is a great circuit when you
want to extend the range of an optical remote control transmitter.
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Xenon Lamp Flash Detector
This circuit has a very low standby current requirement yet has very high
sensitivity toward the light flashes from a xenon lamp. When connected to
a flip/flop it can serve as an on on/off Controller
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