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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. :

AIR Transparency Monitor, Xenon Flash Receiver - 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. . . Circuit by David A. Johnson P.E.-June, 2000

AIR Transparency Monitor-Pg2 - This is Page 2 of the receiver circuit AIR TRANSPARENCY MONITOR, XENON FLASH RECEIVER. . . Circuit 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:

A 12 GHz Super-Easy Radiotelescope -  This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing

A 3-Channel UHF Rolling-Code Remote Control, Pt.1 -  This high-security 3-button UHF transmitter and receiver can be used for keyless entry into homes and commercial premises and for controlling garage doors and external lighting.  Three separate outputs on the receiver can be used to activate various electrical devices such as a door strike, a motorised garage door and 230VAC lights.  Up to 16 transmitters can be used with the one receiver so it's even suitable for a small business.__ SiliconChip

A 70-W S-Band Amplifier for MMDS & Wireless Data/Internet Applications 12/11/00  -  App Note 1038__ California Eastern Laboratories

A bipolar regenerative receiver -  Contrary to what some radio experimenters think, a bipolar regenerative design can be made to work efficiently.  The major concern is the low input impedance of the detector-amplifier bipolar.   __ Designed by Ramon Vargas

A 'bug' receiver -  i have had several requests for a miniature, VHF FM (wideband) transmitter of the type that are commonly refered to as BUG's.  I personally use one of these plugged into my HF rig headphone socket so I can "earwig" QSO's and nets when sitting on the toilet, washing the dishes, bringing in the coal, etc.  I know from experience that this project can be used to stimulate interest in Radio in older children,  __ Designed by Harry Lythall-SM0VPO

A compact beam for 10M -  VK2ABQ/'Moxon Rectangle'.   __ Designed by EI9GQ homebrew radio

A compact L-match ATU for portable use -  No description, schematic only __ Designed by Peter Parker VK3YE

A Crystal Heater construction project -  OK, here is the circuit I used - See image below.   The original National Semiconductor circuit had a 30 K resistor in series with a 400 µF cap., both in parallel with the 100 K resistor on the input of the 1st LM324 section.   I found that combo to actually destabilize the operation of the controller for this particular application, so I removed them & changed the 2 µF cap in series with the 10 megohm resistor to 5 µF. __ Designed by Bob Dengler NO6B

A Dirt-Cheap, High Current Power Supply -  Here's yet another use for that pensioned-off AT computer that's gathering dust in the corner.__ SiliconChip

A Dual Mode Superhet/Direct Conversion AM receiver for 181.818 kHz Lowfer ATtiny2313, AT90S2313 -  This is a description of an experimental AM receiver for VLF.  it is crystal controlled to receive 181.818 kHz (more or less) and operates as either a single conversion superhetrodyne or a direct conversion receiver.  The bandwidths are expected __ Designed by Dick Cappels

A dummy load & power meter for HF (PDF) -  Not everyone can (or wants to) afford that paragon of dummy loads, the Bird wattmeter, or for that matter the rather cheaper but still extremely good dummy load sold by Dick Smith.  And getting your hands on the parts to build the dummy loads in the ARRL handbook isn’t too easy either.  But here is a dummy load and power meter, which you can build from standard parts, which covers the HF range and doesn’t cost an arm or a leg. __ Designed by Jim Tregellas VK5JST

A GPS Module for Your PC -  Link it to your PC and trace your position on and on-screen map.  There's lots of freeware and shareware to use with it as well.__ SiliconChip

A GPS Receiver Based Frequency Standard -  Frequency accuracy has been a topic of special interest to many amateurs and experimenters since the early days of radio.  Until recently, the best frequency standard available to most hams was a crystal oscillator carefully adjusted to zero-beat __ Designed by Brooks Shera, W5OJM

A GPS-Synchronised Clock -  Tired of resetting the time on your wall clock? This GPS circuit will convert a standard battery wall clock into a precision timekeeper that never needs to be corrected.  it will even automatically adjust for daylight saving time.__ SiliconChip

A Homemade Variable Tuning Capacitor -  A 'Multi-Turn' Homemade Variable Tuning CapacitorA remarkably simple Homebrew device for tuning in your FM stations!  __ Designed by braincambre500 @ yahoo.com

A Loud & Sensible Crystal Set Radio Design. -  i'm very well balanced, in that I'vebeen harbouring some electronic chips on both shoulders over the years.  Here is some redress, and I hope some clarification.   __ Designed by Henry 

A Low Cost 4Mbps IrDA Receiver in MS8 & SO-8 Package LT1328 -  DN152 Design Notes__ Linear Technology/Analog Devices

A magnetic loop antenna for 160 to 15m -  amateur radio construction projects.   __ Designed by Peter Parker

A magnetic loop antenna for 40 to 17m local & DX contacts from tight spaces -  amateur radio construction projects.   __ Designed by Peter Parker

A NAND Gate MW Crystal Radio Receiver -  Build this simple crystal receiver getting experience and fun with the interesting CMOS integrated Circuit 4011.   __ Designed by braincambre500 @ yahoo.com

A Phone Line Busy Sensing -  if you need to share a phone line between your home and a repeater, here's how.   __ Designed by Monte Smith, WDŘDIR, from ACC Notes, April, 1986.

A QRP DX antenna -  amateur radio construction projects.   __ Designed by Peter Parker

A quick receiver -  A Direct Conversion receiver is nothing more than a mixer, an AF amplifer and a stable oscillator.  I took one of my standard building blocks; a two diode mixer and connected it to my stereo amplifier PHONO input then fed the signal generator into the mixer.  Connect an antenna to the third port of the mixer and you can receive HF SSB and CW signals.   __ Designed by Harry Lythall-SM0VPO

A Real Yagi Antenna for UHF CB -  Are you good at scrounging? All it takes is some plastic conduit and a couple of wire coat hangers to build this really effective antenna__ SiliconChip

A Repeater Fan Controller using a 556 IC -  This is a follow-up to the above with a modification to a single 556 chip.   __ Designed by George Henry KA3HSW

A Robust Video Receiver with Input Short-to-Battery Protection  -  Getting Started Load the evaluation software by placing the CN-0263 evaluation software CD into the PC.  Using My Computer, locate the drive that contains the evaluation software CD and open the Readme file.  Follow the instructions contained in the Readme file for installing and using the evaluation software.  information and details regarding how to use the evaluation software for data capture can be found in the CN-0263 evaluation software Readme file.  __ Analog Devices from the Lab

A SCA Adapter -  For Advertisement Free Background Music on FM.   __ Designed by G.L. Chemelec

A short wave regenerative receiver -  Sensitivity and selectivity are the major concerns of a short wave enthusiast when he looks up for a receiver.  Commercial communications models with superhet circuitry surely satisfy his requirements, but these are expensive.  He would rather go for a Homebrewed radio, being a regenerative receiver an affordable choice __ Designed by Ramón Vargas Patrón

A Simple Circuit & Sensitive Shortwave Receiver -  Radio Shack offers a series of pamphlets ranging from Communications to Digital Electronics.  I have collected all 9 pamphlets.  if you are ever in the store, do take a look at all the wonderful projects these pamphlets have to offer!  The projects are very diversified, useful and simple to make.   __ Designed by braincambre500 @ yahoo.com

A Simple Circuit Echolink interface -  Easily constructed with about $10 in parts from Radio Shack.  Should work with any radio.   __ Designed by Courtesy of Matt Krick K3MK

A Simple Circuit loop antenna crystal radio -  i love crystal radios and since I could back to my bench a couple of years ago i’ve the opportunity to make some of that.  There something fay behind its elegant simplicity… pick radio waves with only few simple components and use the energy of the radio stations to produce directly the sound you’re hearing is something wonderful to me.  From very simple sets made from the junk box to high performance crystal radios all of them have its appeal.   __ Designed by Marcos Kusnick

A Simple Circuit Repeater Fan Controller -  Unlike many repeater systems, our local club repeater has always been located within a member’s home, many times in a basement or in this case, my home office area.  The latter created a desire to lower the noise level generated by the repeater, specifically, the power amplifier cooling fans. __ Designed by Robert Shepard KA9FLX

A Single Superhet SSB Receiver for 3.5 MHz -  This was my first receiver development that really worked well.  Pictures from the outside and the inside of the receiver.   __ Designed by Herbert Dingfelder

A Superheterodyne Receiver (Using the NE602) -  if you ever dreamt of building a superheterodyne receiver, now you have the possibility of bringing to reality.  your dream!  And this is with a very 'simple-to-manage' integrated circuit, the SA602N.   __ Designed by braincambre500 @ yahoo.com

A Superregen Receiver for FM broadcast or Aircraft band AM reception -  This is the receiver I was bragging about on the Radio index page -- the receiver that is so sensitive it can hear the local oscillator inside a small transistor radio 30 - 50 feet away.  Build one of these little gems and you will be able to hear aircraft pilots many miles away with nothing more than a 24" whip antenna. __ Designed by Rick Andersen

A to D for Amateur Scientists (Not for Radio-SkyPipe Use) -  This is a Radio Astronomy Project __ Designed by Radio-Sky Publishing

A Tone Beep Keyer for Repeaters -  Obtain an Audible indication of Off-Frequency Operation.   __ Designed by Originally Art Gentry W6MEP. Reprinted from May 1974 QST.

A unique PSK transceiver, Version 2 -    NOTE: PA3CNO discovered and devised fixes for serveral problems with the design as discribed below.  I will eventually include his modifications to this page, but for now please see his blog for details on the problems he found and his fixes.   __ Designed by Steven Weber, KD1JV

A universal VCO Board using a MC100EL1648DG & a PGA-103+ as buffer -  The circuit is straightforward. (as usual).  The MC100EL1648 is a voltage controlled oscillator amplifier that requires an external parallel tank circuit consisting of the inductor (L) and capacitor (C).  it does the main job.  For isolation reasons we added a buffer, consisting of a PGA-103+ from Mini Circuits. (Almost any other will also work).  in order to get a "pure" sinewave, resistor R1 is foreseen.  it must be optimised empirically.  Two voltage regulators are used to ensure stable operation. __ Designed by Alexander C. Frank, aka Ajarn Changpuak

A VHF/UHF/LINK repeater interface/controller -  This is a set of nearly identical schematics for circuitry used to provide cross-band inter-agency communications.  __ 

A West Coast Lightwave Project -  The receiver we chose to build was a G3XBM modification of one designed many years ago by K3PGP for his laser experiments. it consisted of a small inexpensive PIN photodiode (BPW34) driving a JFET amplifier, followed by several stages of audio amplification (see Figure 1). __ Designed by Steve McDonald, VE7SL & Markus Hansen,VE7CA

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

 


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