- 10MHz TO 20MHz LASER LIGHT DETECTOR
This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system. It has good ambient light immunity.
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- 20MHz VCSEL 3mW LASER TEST CIRCUIT
This circuit takes advantage of some new vertical cavity surface emitting lasers (VCSEL) that don’t require light output control circuits. The circuit shows how to drive the device from a
single high speed CMOS IC. The circuit can easily be modified to transmit signals from kilohertz to about 50MHz.
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- BROAD BAND 2MHz OPTICAL FIBER RECEIVER
If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector.
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- BROAD BAND 5MHz OPTICAL FIBER RECEIVER
This circuit is a simple broad band light detector that uses a very inexpensive IC and a PIN photodiode that is packaged for use with plastic optical fibers. It has a bandwidth from 1KHz to
over 5MHz. It is great for experimenting with various modulated light sources.
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- C-MOS INVERTER MAKES LOW POWER AMP
With the addition of one resistor and a capacitor, some common logic ICs can be transformed from digital to analog duties. This circuit outlines some the features to expect from
different inverter ICs.
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- FET INPUT HIGH SPEED LIGHT DETECTOR
This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz.
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- FLASHING LED ADVERTISING BADGE #2
This circuit is similar to Flashing LED Advertising Badge #1. It uses a CD4013 dual D Flip/Flop IC. The 74HCT74 IC in Flashing LED Advertising Badge #1 does not always work.
As in Flashing LED Advertising Badge #1, a single lithium battery will provide months of continuous LED flashing. It also has a tiny push-button switch to turn on and off the light
flashing.
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- N-CH AND P-CH TRANSISTORS FORM PUSH-PULL DRIVER
This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to
hundreds of volts. The output current is only limited by the rating of the transistors. I have used this circuit beyond 2MHz.
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