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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. :

Plastic Pipe Finder - I used this circuit once to track down the location of a plastic pipe, buried underground.  It transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away. . . Circuit by Dave Johnson P.E.-December, 2004

Pop Free Microphone On/Off Switch Circuit - This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones. . . Circuit by David A. Johnson P.E.-February, 2002


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

PA Stage temperature controlled FAN speed controller  -  My Radio amateur callsign is OZ2CPU.  I like to use Atmel AVR Atmega PIC 16 PIC 16F876 PIC 16F84.  Most electronics easy made for the novice and something is for the more experienced.   __ Designed by Thomas Scherrer OZ2CPU

Parallel Port VHF FM Receiver -  Use it to monitor the 144-148MHz amateur band, the 132-144MHz band or the 118-132MHz band.__ SiliconChip

Passive-detector receiver keeps you informed, entertained during flights -  05/12/05 EDN Design Ideas:  Receive HF AM signals without battery power __ Circuit Design by David Prutchi, PhD, Voorhees, NJ

PC Serial Port Receiver CMOS -16 Bit -  This circuit was designed to control a 32 channel Christmas light  show from the PC serial port.  Originally designed with TTL logic, it has been simplified using CMOS circuits to reduce component  count.  it is a fairly simple, reliable circuit that requires only  4 common CMOS chips (for 8 outputs) , an optical isolator, and a  few discrete components. __ Designed by Bill Bowden

Pedestrian Mobile HF antenna -  amateur radio construction projects.   __ Designed by Peter Parker

Perco FM Tuner -  Another kit version of the Fremodyne __ Contact blehack @ yahoo dot com

Phase Locked Loop Frequency Synthesizer Demonstration Board -  This document details the evaluation procedures and usage of the Hewlett-Packard HPLL-8001 demonstration circuit board and evaluation software.  All operating conditions and electrical characteristics of the HPLL-8001 are described in the current version of the data sheet__ HP Application Note 1145

Phase Shift Radio Direction Finder -  Similar to the system used in modern aviation where an antenna array modulates the phase of an incoming signal.  The commercial system is known as Commutated Aerial Direction Finding (CADF) where a ring of 18 identical antennas are each switched on in sequence, just like winding a rotary switch round and round so that one antenna is always connected to the receiver.   __ Designed by Harry Lythall-SM0VPO

Pi Filter has Sharp Notch -  Simple filter network makes a great low-pass filter having a sharp notch just outside paSSBand.  Can be implemented as active filter using GIC  circuit.  Use this component calculator to determine resistor and capacitor values.  Voted best of issue!  __ Designed by Jim Haggerman, Hagerman Technology LLC

Pi Section Coupler -  inexpensive gadget tunes antenna for better DX.  Almost any receiver covering 540 kHz to 1600 kHz is suitable for broadcast band DX'ing, and there are a lot of them.  But the antenna is another matter.  if you are new to the hobby, or if you have been having trouble DX'ing those really difficult stations, you may find the answer to your reception problems in a properly constructed long-wire antenna - and the "Pi-section Coupler" __ Designed by Roy A. Walton

Pic-Plot GPIB to RS-232 converter -  Get rid of dry plotter pens or unclear camera snapshots of test instruments when reporting your lab test session.  This adaptor will capture plots or prints of your GPiB instrument to your PC through the serial port.   __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

Pic-Plot2 GPIB to USB converter -  Pic-plot goes to USB  Without any additional adapter, the new Pic-plot2 directly communicates with your PC or laptop through the USB port.  Gives faster downloads from your GPiB instrument and it is self-powered from the host PC: no need of DC adaptor.   __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

Plastic Pipe Finder -  i used this circuit once to track down the location of a plastic pipe, buried underground.  it transmits a weak RF signal, which can be picked up by a portable AM radio from about 6 feet away. . . Circuit by Dave Johnson P.E.-December, 2004

PLL Stereo FM Tuner -  FM radio which uses PIC  micro-computer PLL system__ 

Pocket sized 20m (30m) CW QRP transceiver -  i started to discover the 30m band by using an adapted version of my 80m single-board CW transceiver.  The first impressions were quite encouraging, so I decided to build a portable transceiver for this interesting band.  There was no dilemma about the modulation the transceiver has to support, since the SSB is on 30m not allowed.  I also decided not just to adapt an earlier design, but to design a completely new transceiver.  The goal was to make a gear that would be based on a superhet receiver, would measure less than 10cm x 10cm x 5cm and would include a digital frequency read out __ Designed by Aleksander Stare

Pop Free Microphone On/Off Switch Circuit -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones. . . Circuit by David A. Johnson P.E.-February, 2002

Popcorn direct Conversion receiver -  schematic for a no-frills, relatively low-cost CW superhet receiver with a 4.00 MHz intermediate frequency.  There is no AGC or RF gain control, however this receiver has good large signal handling capability.  This receiver uses just 6 bipolar transistors and an op amp for reasonable volume into headphones.  Much__ 

Post Mixer Amp -  SSB Transceiver-Receiver Section:  The post mixer amplifier, makes up for the losses in the passive mixer and i.F.  port attenuator.  The transistor is a 2N4427, if you don't have one, try a 2N3866, 2N5109, on any similar, medium power VHF transistor.  The output transformer is 10 turns with a tap at 4 turns.  The core is the same, high permeability ferrite ring, used in other parts of this project.  The output supplies DC current for the RX/TX switching diodes at the SSB filter input __ Designed by EI9GQ homebrew radio

Precision measuring receiver (Selective Level Meter) -  This receiver was designed to precisely measure communication channel power over a 90 dB or greater range.  This is useful for monitoring and installation of radio communication systems.  The basic design can be adapted to the low VHF region through 6 GHz.  A TCXO and PLL synthesizer assure accurate frequency setting, while a precision Logarithmic Amplifier (Log Amp) detection scheme __ Designed by Steve Hageman

Programmable PLL (Si570) Local Oscillator for HF Receivers, Transmitters, Transceivers (PDF) -  A new product has recently been developed by Silicon Labs, the Si570 DSPLL® programmable
frequency synthesizer, and it has great potential for use in many amateur radio applications.
Here we will explore some possible uses.  Phase lock loop technology has been in use for many years, but the ability to use variable software-supplied loop parameters in PLL technology to directly generate square waves with frequency resolutions of 1 Hz or less is now possible.  The Si570 immediately puts the new technology into the sphere of uses that has been recently been dominated by Direct Digital Synthesis (DDS) products. 
 __ Designed by Silicon Labs\

Protects Phone Line from Lightning Strikes -  To build a circuit that will help protect your equipment from lightning strikes on the phone line.  This circuit was actually designed to reduce or eliminate a very local broadcast AM radio stations signal from bombarding my parents telephone line, however it also turned out to be a really good lightning protector.  __ Designed by Kevin Custer  W3KKC

PSK Meter (updated 4'th of october 2005) -  PSK-Meter is a controller board to prevent overload of a transmitted PSK-signal at the HF-bands (made in February 2004)  __ Designed by Bjarke Korsgaard

PTT and soundcard interface for the TM255/455 -  Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU

PTT and/or soundcard interface -  Ham Radio - Modems and Soundcard interfaces __ Designed by Guy Roels ON6MU

Pulse Counting Receiver -  Hi Fi quality, high sensitivity, and only one tuned circuitPopular in the UK but virtually unknown elsewhere __ Contact blehack @ yahoo dot com

Puxing radio serial interface schematic, easy to make -  Schematic only, no circuit description given __ Designed by Thomas Scherrer OZ2CPU

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

 


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