Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com has links to 45,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.

HOME Schematics Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches
Welcome to DiscoverCircuits.com - online since 2002

See Media Kit for
Advertising Opportunities

Attention Designers:  Please alert us by eMail if we have linked to sites
where your original material has been copied without your permission.
We will change to the LINK to your site.  
Thank you.

 


Amplifier Circuits:  Intermediate Frequency (IF)
Amplifier -- Main Page

IF Circuits:  #'s - H     I - Z
 

Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E. :
Inductive Pulse Receiver (175Khz)   -  This circuit is discussed in more detail in the Experimenters Journal.  The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by David A. Johnson P.E.-July 09, 2006

Light Pulse Receiver (2uS)   -  Although the LF357 is an obsolete part, this circuit gives you an idea how to build a sensitive modulated light detector with high ambient light immunity.  The first section uses a 100mH inductor as an efficient photodiode current to voltage conversion circuit . . . Hobby Circuit designed by David A. Johnson P.E.-June 03, 2002

Light Receiver 30Khz Amp   -  This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . Hobby Circuit designed by David Johnson P.E.-March 07, 2002

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 07, 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 11, 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 11, 2006

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 04, 2000

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 04, 2000

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 04, 2000

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 04, 2000

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 29, 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 22, 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 17, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

 

Inductive Pulse Receiver (175Khz) -  This circuit is discussed in more detail in the Experimenters Journal.  The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Light Pulse Receiver (2uS) -  Although the LF357 is an obsolete part, this circuit gives you an idea how to build a sensitive modulated light detector with high ambient light immunity.  The first section uses a 100mH inductor as an efficient photodiode current to voltage conversion circuit . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2002

Light Receiver 30Khz Amp -  This circuit uses NPN darlington transistor to amplify the signal produced from short light flashes, as detected by a PIN photo diode.  The circuit draws only about 330uA from a 6v battery . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

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

Trimless IF VCO: Part 1: Design Considerations -  This App Note explores the design fundamentals needed to implement a trimless, fixed-frequency, IF voltage-controlled oscillator (VCO) and points out the challenges in guaranteeing proper circuit operation.  VCOs are essential components in the architecture of most wireless systems.  In dual-conversion approaches, a fixed-frequencyAPP 711: Feb 05, 2001 __ Maxim APP 711Feb 05, 2001

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


 Intermediate Frequency (IF):  #'s - H     I - Z

 


Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches



 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |   
Privacy Policy


Discovercircuits.com endeavors to credit original designers.   Please alert us by eMail so we can
delete links to material that have been copied without your permission
.   Thank you.


© Copyright of all original material on this website is the property
of David A. Johnson, P.E. (Dave Johnson & Associates ) unless otherwise noted.  

Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.
All material is provided "as is" without guarantees or warranty of any kind, either expressed or implied.