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Light Receiver Amp-40Khz - This circuit is similar to 30KHZ LIGHT RECEIVER AMP but provides more gain and operates up to 40KHz. However it draws more power supply current. . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2002
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. . . Circuit by Dave Johnson P.E.-June, 2000
Light Receiver-10MHz to 20MHz - Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006
Low Distortion IF Amplifier/ ADC Driver with Digitally Controlled Gain - LT5524 __ Linear Technology/Analog Devices
Low Power 100khz Light Receiver - By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 micro amps from a 3 volt supply. . . Circuit by Dave Johnson P.E.-April, 2005
Modulated light receiver circuit - 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. . . Circuit by David A. Johnson P.E.-June, 2000
MW Enhanced Crystal Receiver using 741 IC - Ham RadioV-U)HF AMPLIFIERSchematic __ Designed by Guy Roels ON6MU
Optical Fiber Receiver-5Mhz Broad Band - 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 . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Sensitive Modulated Light Receiver uses a Single IC - 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 . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000
Simple Aircraft Receiver - Easy to build, 2 chip Superhetrodyne for the aircraft band. (Featured in EDN) __ Designed by Steve Hagerman
Single IC forms Senesitive 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. . . Circuit by Dave Johnson P.E.-June, 2000
Tunable IF with TDA7000 - The main motive of the mods was not that the circuit didn't work right, but were several tries to add some kind of frequency indicator to the receiver. The left RCA plug and associated components are witnesses to the last version, adding a FET buffer amplifier and taking signal from the oscillator coil. __ Designed by © John Coppens ON6JC/LW3HAZ
Two-Watt TBA820m AF Amplifier - Here is a simple AF amplifier project based on TBA820M IC. This amplifier can deliver two-watt output power with 8-ohm speaker using a 12V power supply. A 3-16V battery or an AC/DC __ Electronics Projects for You
UltraLow Distortion IF Amplifier/ ADC Driver with Digitally Controlled Gain - LT5514 __ Linear Technology/Analog Devices
Ultrasound Receiver-40Khz - A X100 transistor amplifier is followed by a zero cross detector circuit, using a voltage comparator. The output is a TTL logic signal, corresponding to the received 40KHz signal . . . Hobby Circuit designed by David Johnson P.E.-January, 2006
Voltage to Frequency Converter + 1us LED Pulse Driver - This circuit receives the signal from the above amplifier and launches powerful 1uS infrared light pulses from a low cost LED that are frequency modulated by the audio information. The 10KHz center frequency of the pulse stream is low enough so a standard. . . Circuit by David Johnson P.E.-March, 1999
Xenon Flash Receiver-AIR Transparancy Monitor - I designed this receiver circuit many years ago to monitor the quality of a mile long column of air for future optical communications experiments. The transmitter system (circuit 72 below) uses a powerful xenon flash in conjunction with a large 12 inch . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000 |
