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Acoustic Circuit
s
Acoustic/Ultrasonic Circuits:  A - T      U - Z
 

Last Updated: October 24, 2017 02:54 PM



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

Long Loopstick AM Radio Antenna -  Wound on a 3 foot length of PVC pipe, the long loopstick antenna was an experiment to try to improve AM radio reception without using a long wire or ground.  It works fairly well and greatly improved reception of a weak station 130 miles away.  A longer rod antenna will probably work better if space allows __ Designed by Bill Bowden

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

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

Medium Wave Active Antenna -  This circuit is designed to amplify the input from a telescopic whip antenna.  The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz.  The tuning voltage is supplied via RV2, a 10k potentiometer connected to the 12 Volt power supply __ Designed by David Sayles

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

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 antennaand the "Pi-section Coupler" __ Designed by Roy A. Walton

Q Multiplying Loop Antenna -  Hand drawnThis circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception. __ Designed by Andy Collison

QRP Antenna Tuner -  This circuit is for a QRP (low power) antenna tuner, a.  k.  a.  a transmatch, for use in the short wave amateur radio bands from 3-30 Mhz.  It allows a wide variety of antennas to be connected to a low power transmitter.  When the circuit is properly tuned, the maximum transmitter power will be delivered to the antenna.  It is used in conjunction with a standing wave ratio (SWR) meter.  This is a fairly generic antenna tuner circuit. __ Designed by G. Forrest Cook

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

RF Amplifier for Ferrite Bar Antennas -  The author described assembling this circuit on a 1"*1" perf board, I actually laid out a small PC board with excellent results.  In this era of surface mount components, I think a much smaller version can be laid out on a PC board, allowing this circuit to be put inside even the smallest radios, such as Walkmans.  If I do such a board, I will put the PC board artwork here. __ Designed by Bruce Carter

Shorty Forty Antenna -  Do you have space limitaion to put a 40 meter dipole.  Try this Compact 40 meter antenna. 

Small, 915-Mhz Antenna Beats Monopole -  05/15/03  EDN-Design Ideas A 915-MHz data-acquisition project required a small antenna, but the available antennas lacked the necessary characteristicsefficiency, compactness—that is, smaller than a standard 3-in.  monopole—with adequate bandwidth, and with __ Circuit Design by Dave Cuthbert and Bob Casiano, Micron Technology, Boise, ID

Tesla Power Receiver -  Here's something that has always bugged me: light waves are about 5000 Angstroms in wavelength, while atoms are more like 1 Angstrom across.  Atoms are thousands of times smaller than light waves, yet atoms obviously interact very strongly with light.  How can they do this? Perhaps they get around the problem by employing Quantum Mechanics (photon-physics rather than EM waves?) There must be some explanation. __ Designed by William J. Beaty

The ATL-3 Loop Antenna -  All ATL-3 loop windings are centre tapped and balanced w.  r.  t.  their amplifier/receiver chassis ground, and therefore electric field interference pick up tends to self cancel.  Magnetic noise fields, e.  g.  televisions and the electric meter box, or __ Designed by Graham Maynard

The KØLR LF Antenna Meter -  If you plan to become active on Canada's new 630m ham band, one of the first things you're probably thinking about is an antenna and how to make it resonant. Without the proper instruments, determining antenna resonance below the broadcast band can sometimes require a combination of good luck and black magic! __ Designed by VE7SLSteve

The versatile end-fed wire -  A piece of wire of almost any length can be used as an antenna on the HF bands.  However, just because an antenna can be made to work is no guarantee that it will perform efficiently.  This article will initially concentrate on the half wavelength of wire and its useamateur radio construction projects. __ Designed by Peter Parker

TV/Radio Antenna Cable galvanic isolator -  A ground loop in your AV system caused by antenna connection or TV cable is very common if you have your computer connected to the same system.  This type of ground loop problem can be solved by using suitable isolation between your AV system and the antenna cable.  The simplest way to get rid of the hum is to disconnect the antenna cable from the AV system.  If you still want to watch cabe TV or listen to your radio an keep the system hum free then you have to install isolators to all those antenna cable connections your system has __ Designed by Tomi Engdahl

Unamplified Four Foot Box Loop -  I have been using a three foot box loop that Don Moman in Edmonton, Alberta put together for me for several years now.  I have been more than happy with its performance, and I have a long list of leggings to prove it, However I have been wondering how a four foot loop might help out my DX'ing by producing either a better signal or deeper nulls.  I set out to build this four foot model in every way.  My four foot loop did carry on one important idea that Don Moman's loop had and that was the less metal the better.  The four footer has as does the three footer only four screws and two bolts.  The rest of the loop is wooden thus keeping the antenna's pattern as true as possible. __ Designed by Bruce Carter

Versatile end-fed wire -  A piece of wire of almost any length can be used as an antenna on the HF bands.  However, just because an antenna can be made to work is no guarantee that it will perform efficiently.  This article will initially concentrate on the half wavelength of wire and its useamateur radio construction projects. __ Designed by Peter Parker VK3YE

WIFI CAN Antenna -  Got no dough for a commercial WiFi antenna? Looking for an inexpensive way to increase the range of your wireless network? A tin can waveguide antenna, or Cantenna, may be just the ticket.  This design can be built for under $5 U.  S.  and reuses a food, juice, or other tin can 

Wireless Phono Oscillator -  A "phono oscillator" is a simple, short-range AM band transmitter that was typically used to send the signal from a phonograph to a nearby radio, eliminating the need for an amplifier and speaker.  This version uses only one transistor and __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Yagi Antenna -  To improve signal transmission or reception in specific directions, basic elements, either vertical or horizontal, can be combined to form arrays.  The most common form is the Yagi-Uda parasitic array commonly referred to as a Yagi array or beam.  It consists of a driven element which is either a simple or folded dipole and a series of parasitic elements arranged in a plane.  The elements are called parasitic because they are not directly driven by the transmitter but rather absorb energy from the radiated element and re-radiate it. 


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