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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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AM RADIO sa AM RADIO ACCESSORIES sa AM RADIO ANTENNA sa AM RADIO MAINTENANCE & REPAIR sa AM RADIO TRANSMITTER sa SINGLE-SIDEBAND RADIO x AMPLITUDE MODULATION RADIO xx RADIO Tips on digital readouts for AM/FM tuners. High-quality AM from a crystal radio. Design and construction of a mono receiver. A simple, high-quality AM tube receiver. Improve Dynaco's FM-5 FM tuner and AF-6 AM/FM tuner by adding IC voltage regulators. Also correct the low-frequency drop in the demodulated signal of the early model FM-5. Build a simple AM radio receiver from magnet wire, a germanium diode, and an old telephone handset. Est. cost: $10. Two transistor, one IC receiver based upon a super-regenerative circuit. Works well with both wideband and narrowband FM as well as AM. Tuning range is from 88 to 210 MHz. Multi-modulation. Ideas for combining AM and FM modulation into an AM modulated FM carrier that contains both audio channels. Broadcast-band RF amplifier circuit improves AM radio reception in low- and mid-priced receivers. One-tube breadboard radio designed for high-fidelity AM reception. A super portable with lots of volume. Est. cost: $30. Two-watt mini amplifier for small portables. Four-tube receiver built into bookends. One-tube receiver uses compactron tube. Simple receiver uses Motorola integrated circuit. Radio receiver using one field-effect transistor (FET) producing good headphone volume. FET theory explained. Three basic radios for beginners. (1) crystal radio, (2)amplified crystal radio, and (3) regenerative radio. One-tube all-bander. A low-cost, high-performance receiver for the listener on a budget. Operating frequency is changed by plugging in a different coil for each band 15, 20, 31, 40, 80, and 160 meters plus the broadcast band. Broadcast band preamplifier adds 20 to 40 dB to pull in more distant signals. One-station receiver built into the wooden enclosure of a 6" speaker. One knob turns set on and controls volume. Tuner is preset to a favorite station. Tips on making an operating AM receiver using a Plessey ZN414 IC, a simple power supply and a hand-wound coil. Circuit for a regenerative AM receiver (circa 1962) has been upgraded to use parts that are commonly available today (circa 1997). Percentage modulation nomogram. A simplified method of determining the percentage of amplitude modulation by use of a straightedge. Beginner's special. Four-transistor regenerative receiver and 3-transistor audio amplifier covers entire broadcast band .55 to 1.6 mc. Est. cost: $12. A radio in a tin can serves as the base for a table or desk lamp. Radio uses one tube and is housed in a tobacco-size can. A 117-volt light socket and lamp shade complete the lamp. Est. cost: $16. Single-tube superhet broadcast receiver. Superheterodyne radio circuits. How they work. High-voltage, two-transistor broadcast band regenerative radio operates off AC power. One diode and capacitor added to any AM detector will nearly double the output. Can also be used on CB, shortwave or crystal sets. Build a TRF (tuned radio frequency) radio that uses an integrated circuit. This receiver is highly selective in its ability to separate stations and deliver a full measure of low-distortion sound. Powered by a 1-1/2 volt battery, you can operate the radio 24 hours a day for 90 days. AM broadcast band receiver with built-in two-channel crystal controlled VHF receiver. Can be used as a BCB radio, a VHF scanner, or a BC radio with a VHF override. This broadcast band receiver uses a soild-state device called a Varactor diode for tuning instead of a larger tuning capacitor. Build an antique antenna-less 1-tube regen receiver. A model maker's delight that actually works. Beginner's field effect integrated circuit broadcast band AM receiver. Tunes from 550 kHz to 1600 kHz using a modern version of the regenerative receiver. Powered by two #6 dry cells (1 1/2 volts each). The theory and physics of radio waves, carrier waves and AM and FM modulation. The theory and physics of radio sidebands. Breadboard AM receiver is a one-tube unit based on the depression-days design. Uses a 27 tube, hand-wound coils, homemade capacitors and earphones. Signal snare, an easy-to-build one-transistor reflex receiver. Powered by 6-volt lantern battery and requires headphones. Solar powered AM radio receiver is encased inside an old vacuum tube. The tube and tuning capacitor are mounted on a decorative wooden base. Build this one-tube regenerative receiver, a broadcast band receiver design from the early days of radio. Vintage glass. Schematic of the Scott 800-B AM/FM main receiver chassis and power supply How to build a 1920's style wireless receiver. Add a digital dial. Add an accurate, digital-tuning indicator to an inexpensive or antique radio to read out AM and FM received frequencies. Circuit for a "Super-Simple-Dyne" broadcast receiver incorporates a 4001A CMOS quad 2-input NOR gate IC. Circuit for a phase-locked loop broadcast receiver. AM-3 walkabout radio. "Walkman" style miniature AM radio does not compromise sound quality. Requires only a single 1.5-volt AA cell. Est. cost: $25. Circuit for an ultra-simple, broadcast band, super-regenerative receiver that's capable of picking up a number of local stations using nothing more than a two-foot hank of hook-up wire. Grandpa's antique radio. Make and enjoy a reproduction of an early 1920's two-tube regenerative radio which actually performs by using solid-state devices. Old time radio receiver circuit consists of a Hartley Oscillator (built around a type 30 triode), tickler coil, and earphones. Modulation and demodulation, the process used in virtually every type of communications system for transfering information. Basic concepts of AM and FM modulation. Experiments include building modulator and demodulator circuits. Single transistor BC radio circuit is powered by RF power cells. Super-sensitive BC receiver can pull in stations using just a 3-ft. antenna. Operates on 1.2 to 1.6 volts. One-transistor model uses battery and phone. One-tube receiver is easy to build. Microcircuit receiver uses integrated circuits by Motorola. Mini modules: great fun for hobbyists. A look at an AM radio you can build using mini modules. A basic three-tube you can build. Uses the tuned frequency circuit. Est. cost: $20. Build a hi-fi quality AM radio receiver. Features a quality speaker, integrated circuit electronics and a decorative wooden cabinet. Est. cost: $40. Easy-to-build CMOS radio receiver. Learn how to handle CMOS integrated circuits while constructing this unit. Powered by a 9-volt battery. Why SSB? Understanding the differences and similarities between AM and SSB radios. Tuner specs and what they mean. Examining manufacturers' tuners or the tuner sections of receivers. Radio-on-a-chip. Build a TRF (tuned radio-frequency) radio with a tiny IC (ZN414) that contains most components needed. Tunes stations from 550 to 1600 kHz on the AM broadcast band. Mixing frequencies. Photos help explain complex linear mixing to amateur radio operators and others. Helps explain AM radio and sidebands. Forgotten modulation methods. Understanding amplitude modulation (AM), single sideband (SSB), amplitude compandered sideband (ACSB) and Regency modulation. Diagrams of two 2-transistor AM receiver circuits. Improve the sensitivity of a small receiver. Transistorized broad-band receiver circuit. Improving audio quality on inexpensive receivers. Miniature transistor superheterodyne broadcast-band radio. Mechanical filter sharpens bandwidth for optimum reception of AM, CW, SSB, and CB. Two-transistor "all-wave" radio receiver circuit. Circuit of a basic one-transistor TRF receiver consisting only of antenna, tuned circuit, headphone and battery. Successive circuits show additions to the basic circuit to improve quality of reception. Simple receiver circuit features greater efficiency from full-wave detection of an AM radio frequency wave. Circuit uses antenna, tuned circuit, diodes, capacitor and headphone. The FET set. A battery powered BCB regenerative receiver uses a field-effect transistor (FET). Plays for one year on a 6-volt battery. Est. cost: $10-$15. Build a stacked-antenna AM radio. Battery powered unit uses two loopstick antennas. Est. cost: $5. Convert an inexpensive AM transistor radio into a tuner which you play through your hi-fi amplifier. This will improve the quality of the sound. Est. cost: $ .25 Beginners FET regen receiver. Regenerative receiver uses a field-effect transistor and tunes in DX as well as local broadcast stations. Uses three changeable coils covering 0.55 to 1.5 MHz, 1.7 to 5.5 MHz, and 5.5 MHz to 18 MHz. Powered by a 9-volt battery. Est. cost: $25-$32. Circuit for an AM receiver which uses no power source and one transistor. High-quality, solid-state broadcast band tuner for hi-fi rigs. Regenerative AM broadcast band tuner employs a varicap diode in place of the common ganged capacitor. Simple broadcast band receiver demonstrates the use of a field-effect transistor (FET) as an RF amplifier. Three-transistor regenerative receiver circuit. Circuit for a broadcast band receiver that has a reflex front end and IC op amp audio amplifier. The op-amp AM radio receiver. One circuit requires no external power supply and must be used with earphones. The second circuit is powered by a 9-volt battery. Build a synchronous detector for AM radio. Improves frequency response and removes distortion. Miniature BC (AM broadcast band) receiver circuit uses a ferrite loopstick as the antenna which is tuned by a variable capacitor. Radio receiver is powered by sunlight or a bright lamp. The circuit is built around a ZN414 integrated circuit. Cummings Solodyne. Learn all about the one-tube, one-battery circuit, no larger than today's transistor radios, that was made obscure before its time. BC "hearing aid" is really a miniature radio that is built to resemble a hearing aid. RF enhancement circuits designed to breath new life into older shortwave receivers, or to pull in a DX broadcast station from across the country on a generic AM radio. (1) Signal-grabber. (2) Signal booster. (3) Tunable trap. (4) Signal scrubber. (5) VLF converter. Solid-state version of the popular reflex-radio circuit of the 1920's. Regenerative receiver is a solid-state version of the extremely popular tube-type built by so many hobbyists over the years. TRF radio circuit uses a single chip which includes three stages of RF amplification and a detector. Super-Simple Shortwave Receiver. A single-conversion superheterodyne designed for listening to AM broadcast stations in the range of 4- to 10-MHz (75- to 30-meters). This receiver can tune any 2.5-MHz portion of the 4- to 10-MHz shortwave radio band you select. Est. cost: $30 (kit). Easy-to-build AM receiver circuits. (1) Basic circuit. (2) Amplified-output receiver. (3) Very low frequency tuner. (4) IF amplifier. (5) Voltage control (regulator) for a 6-volt source. Build a one-tube AM receiver for high-fidelity listening. Powered by batteries. Build a preselector to improve the reception on the AM broadcast band. Build the magic eye tuning indicator for an AM radio, like those found on 1940s radios. Secondary uses for Tesla coils. (1) Simple AM radio receiver. (2) Lightning indicator uses an LED bargraph to show signal strength. Low-distortion, low-level amplitude modulator (AM) circuit. An 8-transistor set that can be built in 30 minutes. Stereo and AM radio in a suitcase for $48. A five-way radio breadboard includes a wireless mike, touch alarm, code transmitter, phono oscillator, and AM receiver. A 6-transistor, battery powered receiver has two IF stages and no IF transformers. Build a 1-transistor autogen radio which will tune up to nine local stations by flipping a selector switch. Also provides complete manual selection. Build an AM/FM frequency display. Part 1. Gives you a digital readout of the frequency on which your receiver is set. It also displays the time of day. Unit is crystal controlled for accuracy. Est. cost: $45. Build an AM/FM frequency display. Part 2. Broadcast-band RF amplifier circuit can be added to a low- to mid-priced receiver or car radio to improve AM reception. All-band VHF receiver. Tune police, fire, aircraft, weather, FM, CB, AM, etc. Est. cost: $24. BCB 2 for beginners. Full-fledged superhet with only two tubes. Est. cost: $18. Variometer radio. Modern version of a radio first used in the 1920's. Pocket-size portable radio has unusual sensitivity and selectivity. Increase broadcast band sensitivity with a battery-powered preamp with amplification provided by a field-effect transistor. Will provide a nominal 6- to 12-dB gain (1 to 2 S units). Est. cost: $10. Two-tube broadcast band receiver uses a reflex circuit. Constructed on two identical chassis, one containing the power supply which employs a conventional half-wave circuit, using a silicon diode and RC filtering, and the other chassis holding an untuned RF breadboard amplifier. Build a transistor radio into the base of an old-fashioned horn loudspeaker. Easy-to-build, integrated circuit, low frequency, regen receiver tunes from 80-kHz to 420-kHz. Uses plug-in coils. BCB project lets you construct a reflex circuit and a universal B-plus power supply. Multiband VHF receiver will tune from 26 to 185 MHz by plugging in one of five coils. Est. cost: $24. Spider web radio receiver you can build. Uses interchangeable spiderweb coils to cover three bands (7 MHz to 14 MHz, 1.7 MHz to 5 MHz, and .55 MHz to 1.6 MHz). Design incorporates a FET regenerative detector circuit and an audio stage which uses a pnp transistor to drive a pair of headphones. Powered by a 6-volt lantern battery. How to make an electrochemical cell. A voltaic pile and two fuel cells (one using hydrogen and one using alcohol). Also, a circuit for a cell-powered radio receiver. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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