|
|
|
R-399-A Communications Receiver - ….(Circuit design added 06/09)
|
|
RC receiver hosts two independent switches - 6-Jun-96 Issue of EDN
Typical inexpensive radio-control (RC] systems have servo-motor outputs, but
no on/off switch outputs. You can add two independent RC switches to a
system without making any transmitter or receiver modifications.... [Design
Idea by Tom Howell, US Army ARDEC, Picatinny Arsenal, Dover, NJ] |
|
Receiver - (electronic circuit added 4/05) |
|
Receiver Battery Low Voltage Alarm - ….... [Site is under
construction right now] |
|
Receiver Building Blocks - (design added 8/03) |
|
Receiver Circuit-Ultrasonic Switch - The circuit described
generates (transmits) ultrasonic sound of frequency between 40 and 50 kHz.
As with any other remote control system this cirucit comprises of a mini
transmitter and a receiver circuit. Transmitter generates ultrasonic sound
and the receiver senses ultrasonic sound from the transmitter and switches
on a relay |
|
|
|
Reflex Receivers - The reflex receiver uses the same transistors to amplify
the RF and the audio independently, effectively doubling the transistor count!
Reflex designs were born in an era when transistors cost several dollars each and
pressing them into "double duty" was worth some effort....(design added 8/03)
|
|
Regenerative Receivers - (design added 8/03) |
|
|
[_OLD-ads-dont_upload/OLD I-ADS from web/ad-djandassoc.htm] |
|
|
Regenerative Shortwave Receiver - (design added 8/03) |
|
RF receiver circuit - .... |
|
RFRXD0420 Receiver Module - Microchip Application Note Published 20-Jun-03
(app note added 2/06) |
|
RX3302 superregenerative receiver module schematic - superregenerative
receiver module schematic…. [Peter Jakab, Electrical Engineer, Engineer of
Informatics] |
|
Sensitive DX TRF Receiver - This is a perfect broadcast direct TRF receiver.
It is designed for the detection of AM signals in the 150kHz to 3MHz. This
circuit features good sensitivity, selectivity and high audio output level. Especially
gives high and quality sound.You can put a small rfc choke to the enter of the
receiver for erasing parasitic FM signals. Perfect for LW and MW but for
short wave.... [Circuit designed by Husnu Kokturk] |
|
Short Wave 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.... [Ramón Vargas Patrón] |
|
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.... [Ramón Vargas Patrón] |
|
Simple Circuit Detects Current Pulses - 01/06/94 EDN-Design Ideas....The
pulse detector provides a visible indication of positive and negative current pulses.
The pulses amplitudes can vary from20 to150 mA. The pulses durations can range from10
to40 msec, and their repetition rate can span40 to180 pulses/minute.... [Design Idea
by Richard McGillivray, Grey Bruce Regional Health Centre, Owen Sound, Ontario,
Canada] |
|
Simple Crystal Radio - The crystal radio gets its name from the galena
crystal (lead sulfide) used to rectify the signals. A "cat's whisker" wire contact was
moved about the surface of the crystal until a diode junction was formed. The 1N34A
germanium diode ….(added 04/05/06) |
|
Simple Two-transistor Radio - Here is a simple radio that was designed to
minimize unusual parts; there isn't even a detector diode! The sensitivity isn't as
high as the one-transistor reflex but the simplicity is attractive. Strong stations
will provide plenty of volume....(electronic design added 05/06/07) |
|
Single Chip Builds Tiny Aircraft Receiver - 09/25/97 EDN-Design
Ideas....It's easy to become bored spending time in airports. After all, you can do
only so much work on a notebook computer with no reference material around. So, relax
and have some fun at the airport--build the tiny, single-chip, aircraft-band radio
in.... [Design Idea by Steve Hageman, Hewlett-Packard, Santa Rosa, CA] |
|
Smart AIR Handler using ProMPT™ & the PIC18F2539 - Microchip Application
Note Published 27-Dec-02....[App Note] |
|
SOP Direct Conversion Receiver - (design added 8/03) |
|
SOP Receiver - .... |
|
SSB ADAPTOR - Build this simple adaptor to receive single side band SSB on
short wave AM receivers...... |
|
SSB AF Filter - This is a simple filter that restricts the LF response a
little as well providing quite a heavy HF roll-off. The prototype has enhanced a Yaesu
FT101B that was only fitted with an AM IF filter. The IC is an LM358…. [from Harry
Lythall's website] |
|
Suddent ionospheric disturbance (SID) receiver - Schematic only, no circuit
description included…. |
|
Super 80 Ultra Simple SSB Receiver for 3.5 MHz - amateur radio construction
projects…. [from Peter Parker's website] |
|
Superregenerative 27MHz Receiver - (design added 8/03) [Peter Jakab,
Electrical Engineer, Engineer of Informatics] |
|
Super-Tiny Receiver - Here is a VLF receiver built into an earphone plug! I
recently acquired a digital voice recorder to replace the microcassette recorder above
and discovered that it is extremely sensitive, easily amplifying the signal from the
FET version of the computer-powered receiver above. This new receiver consists
of a very low current JFET, a bias resistor (2, 22 megohms in series) and a capacitor;
that's all! The recorder is designed to power electret microphones so no
battery....(electronic design added (6/07) |
|
SW Receiver Using MK414 - ….(electronic schematic added 03/08) |
|
SW Receiver using the ZN415 - A Short Wave Receiver based on the MK484
(formerly ZN414) that includes the tropical bands and 49 metre bands. [Andy Collison] |
|
SW 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. [Ramón Vargas Patrón] |
|
Synthesized HF Receiver - This receiver was originally designed for
simplicity and low cost, but, like other projects, it grew. My receiver is now
synthesized and the performance is quite comparable to many commercial designs. The
unusual features of this design are: * Common AF transistors
and AF circuitry have been used for the IF amp, in a transformerless design.
This aids construction and stability.; * IF bandwidth is
restricted by conventional L.C. tuned circuits which are not damped by any resistive
or active devices. This gives a performance, even for CW working. The IF is
500KHz and NOT 465KHz.; * Options for three different Local
Oscillators. I used a Marconi Sig.Gen. with this receiver for over a year, before I
overcame lethargy and built a decent LO.... [Design by Harry Lythall - SM0VPO] |
|
|
