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Receiver Circuits
Receivers:  # - B        C - H        I - P        Q - S        T - Z


Last Updated: October 24, 2017 02:55 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.-June, 2000

Infrared Remote Extender Circuit - This circuit is designed to be placed directly in front of a standard TV or VCR remote.  The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


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

I.F. Amplifier -  The i.F.  transformer primary has 18 turns, the secondary winding has 4 turns.  The capacitors across the iFT primaries are 82pF.  The input/output transformer has 12 turns, tapped at 3 turns from ground.  This transformer is wound on a ferrite core.  The MOSFETs are 3SK45's.  The diodes in the product detector are 1N34's.  I use a six pole SSB filter from a scrap CB.  The centre frequency is 7.8MHz.  The -6db bandwidth is about 2.5KHz.   __ Designed by EI9GQ homebrew radio

IC Forms Differential Line Driver/Receiver -  05/25/95 EDN Design Ideas:  you can use the HFA1212 dual video buffer to implement differential line drivers and receivers with a minimum of external components __ Circuit Design by Mark Amarandos, Harris Semiconductor, Costa Mesa, CA

IC oscillator 1...30MHz using 74LS04 chip -  Ham Radio - V-U) HF AMPLiFiER - Schematic __ Designed by Guy Roels ON6MU

ICOM CI-V interface with RS232 RTS to PTT -  This page describes my home-built IC OM Ci-V interface.  in order to connect most all IC OM radios to a computer, an additional interface is required.  The interface bridges the gap between the RS-232 electrical levels used by the computer serial port, andthe open collector shared bus used by the IC OM radios.  The interface, therefore, is not much more than a level converter__ 

IF Amplifier -  Three of these amplifiers are used in series to build the 455 kHz iF amplifier.  AGC voltage comes from the AGC Circuit.  The diagram above shows the circuit for the second iF amplifier.   __ Designed by Web David White, WN5Y

Improved Active Antenna -  The first 10 mH inductor used in the prototype has about 100 ohms of resistance and that resistance is important in the source of the first J309.  if you inductors are significantly lower in resistance, add a series resistor to total around 100 ohms.  The other two chokes in the power supply should be below about 100 ohms, but lower resistance is fine.  Lower value chokes can be used, but at some point, the low frequency response will suffer.  For 100kHz and above, 1 mH is good.  Also make sure that the lower value choke exhibits 100 ohms of resistance in the source of the JFET by adding series resistance. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Improved CMOS RF PLL Sythesizer -  Lock range extended up to about 400:1 (50KHz, 2MHz).  Spectral purity improved, reduced reference frequency FM ripple.  Output level buffered to over 200mW RF power output.  Unecessary DiP switches removed, silly combinations not possible.  BMP format single-sided PCB foil available for downloading.  External VCO/Prescaler PCB to follow shortly (up to 150MHz)  __ Designed by Harry Lythall-SM0VPO

Improved Infrared Receiver with status led -  This is a general purpose serial port infrared receiver.  With the help of appropriate software (see below) you can control different functions of your pc from a distance.  For example you can control your home cinema settings (volume, play, pause, stop etc) , your winamp etc __ Contact IQ Technologies

Improved One Tube FM Tuner -  in view of the poor performance of the above receiver, I modified the designStill using a 6C4, it is about the simplest valve receiver for FM  __ Contact blehack @ yahoo dot com

Inductance/Capacitance Meter Project -  i have taken these two projects from the ARRL Handbook 2002.  it had been in the book for a few years now.  A couple of years ago I made both of the projects, and they have been performing well since.  Since the words and schematics were so small and unclear, I had decided to re-type all the text and re-do both schematics.  as to make it easier for viewing.   __ Designed by braincambre500 @ yahoo.com

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

Inductively sense aircraft engine valve position -  04/25/14 EDN Design Ideas:  Aircraft engine designers are conservative by nature, but here's a way to improve performance anyway.  This design uses an inductor to sense the position of a valve on an aircraft engine as a way to get camshaft position information.  Knowing the camshaft position along with the crankshaft position allows fuel injection while the intake valve is open and the use of individual coils for each cylinder.   __ Circuit Design by Angus McCamant

Infrared Receiver for Sony Remotes -  infrared remote controls are using a 32-56 kHz modulated square wave for communication.  These circuits are used to transmit a 1-4 kHz digital signal (OOK modulation) through infra light (this is the maximum attainable speed, 1000-4000 bits per sec).  The transmitter oscillator runs with adjustable frequency in the 32-56kHz range, and is being turned ON/OFF with the modulating signal, a TTL voltage on the MOD input.  On the receiver side a photodiode takes up the signal.  The integrated circuit inside the chip is sensitive only around a specified frequency in the 32-56 kHz range.  The output is the __ Designed by Peter Jakab

Infrared Remote Extender Circuit -  This circuit is designed to be placed directly in front of a standard TV or VCR remote.  The exiting light pulses produced by the circuit match the pulses from the remote but are about 10 times more powerful . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Interference Canceller -  This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing

IR Music Transmitter & Receiver -  Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres.  The circuit can be divided into two parts: iR music transmitter and receiver.__ Electronics Projects for You

IrDA Serial Receiver -  This is a simple serial port irda receiver.  __ 

Jaycar AA-0474 Valve Amplifier (Part 1) -  it looked nice and the price was right, but this Chinese vacuum tube amplifier turned out to be a fake __ Contact blehack @ yahoo dot com

Jaycar AA-0474 Valve Amplifier (Part 2)  -  The fake amplifier is rebuilt as a real valve power amplifier __ Contact blehack @ yahoo dot com

Jupiter receiver notes. KISS mixer -  Notes on a few experiments for my Jupiter receiver. __ Contact Vasily Ivanenko

KD2BD ATV AM Video Modulator -  video signal processing circuit that allows adjustment of video gain, video bias, sync and sync level__ 

Keep Wandering Children & Pet Nearby -  12/02/10  EDN Design Ideas:  The receiver circuit in Figure 1 sounds an audio alarm when the transmitter (Figure 2) moves beyond a designated perimeter.  The transmitter, a voltage-controlled oscillator, operates at approximately 915 MHz in the unlicensed iSM (industrial/scientific/me __ Circuit Design by Tom Au-Yeung and Craig Sakamoto, Maxim Integrated Products, Sunnyvale, CA

Kenwood TH-D7 NMEA GPS bug fix -  Almost all APRS enthusiasts know that earliest version of this popular Kenwood transceiver is not always compatible with latest GPS models.  We found a solution.  __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

Kenwood TR-7950 manual & Schematics -  Being used in a mountain-top repeater, our TM451 transceivers suffered severe frequency shifts as the temperature varied.  They are exposed to temperatures as low as -15C in winter and as high as 45C in summer, and the original crystal oscillator is too sensitive to this variations.  We measured the repeater to be as high as 2.5Khz up or down in frequency depending on ambient temperature, and we looked for a solution.  __ 

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Receivers:  # - B        C - H        I - P        Q - S        T - Z

 


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