Correction CQ. THE RADIO AMATEUR'S JOURNAL Jan 1985 (v.41#1) pg. 10
How to build a super simple keying moniter which utilizes a piezoelectric buzzer.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1985 (v.41#1) pg. 39
Adding touch control to your Vibroplex EK-1 "Brass Racer" keyer.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1986 (v.42#1) pg. 13
Paddle and keyer. Notes on current amateur CW technique. How to use both iambic and non-iambic techniques.
CQ. THE RADIO AMATEUR'S JOURNAL Dec 1986 (v.42#12) pg. 20
How to build an instant in-line inverter for your negative electronic key (such as the Vibroplex EK-1).
CQ. THE RADIO AMATEUR'S JOURNAL Jul 1987 (v.43#7) pg. 38
Morse box tone converter. This battery-powered unit interfaces your transceiver's audio output and a telegraph sounder.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1988 (v.44#2) pg. 74
How to build a junk-box iambic paddle key. Adjustment screws give micrometer precision in setting contact spacing.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1990 (v.46#2) pg. 34
How to build your own mini hand key.
CQ. THE RADIO AMATEUR'S JOURNAL Jun 1990 (v.46#6) pg. 34
Morse code generator uses the 8748 microcontroller IC to automatically send a programmed CW message. Use it to run a beacon or ID a repeater.
CQ. THE RADIO AMATEUR'S JOURNAL Mar 1991 (v.47#3) pg. 48
How to adjust the semi-automatic telegraph key (bug) and use it on the air.
CQ. THE RADIO AMATEUR'S JOURNAL Oct 1991 (v.47#10) pg. 34
Build your own Morse meter to gauge code speed. Calculates words-per-minute of transmitted or received Morse code.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1994 (v.50#11) pg. 32
New life for old bugs. Quick and easy restoration process for semi-automatic code-sending keys. How to adjust a bug for great on-the-air operation.
CQ. THE RADIO AMATEUR'S JOURNAL Oct 1995 (v.51#10) pg. 44
The mouse key. How to convert a computer "mouse" into an iambic keyer for sending code.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1996 (v.52#11) pg. 20
Ergonomic improvement and adjustment of the Vibroplex Iambic paddle. Redesigned fingerpieces, shorter feet, and proper adjustment improve this well respected key.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1997 (v.53#2) pg. 16
The tuppeny paddle. Build an iambic paddle keyer from two pennies, a spring clothes pin, a discarded ballpoint pen, scrap wood, and a few nuts, bolts, and washers.
CQ. THE RADIO AMATEUR'S JOURNAL May 1998 (v.54#5) pg. 28
Improving the AEA Model MM-3 keyer. Increasing RF immunity, improving side-tone audio, and changing paddle voltage.
DX MAGAZINE Jul 1991 (v.3#7) pg. 10
CW (Morse code) filter. An add-on audio filter having a narrow bandwidth will improve CW reception.
ELECTRONICS EXPERIMENTERS HANDBOOK 1996 pg. 57
CW keying monitor.
ELECTRONICS ILLUSTRATED Jan 1963 (v.6#1) pg. 45
Simple practice key and buzzer.
ELECTRONICS ILLUSTRATED Jul 1963 (v.6#4) pg. 50
Key click filter eliminates RF spikes.
ELECTRONICS ILLUSTRATED Jul 1963 (v.6#4) pg. 97
Electronic keyer for clearness and speed.
ELECTRONICS ILLUSTRATED Sep 1963 (v.6#5) pg. 82
Cheap sideswiper for electronic keyer.
ELECTRONICS ILLUSTRATED Sep 1963 (v.6#5) pg. 85
Automatic CQ sender.
ELECTRONICS ILLUSTRATED Jan 1964 (v.7#1) pg. 76
Automatic code sender transmits what you type.
ELECTRONICS ILLUSTRATED Mar 1964 (v.7#2) pg. 79
Wireless CPO aids you in picking out signal from noise.
ELECTRONICS ILLUSTRATED Sep 1964 (v.7#5) pg. 96
CW keying monitor has pitch and volume control and is powered by your transmitted RF.
ELECTRONICS ILLUSTRATED Jan 1965 (v.8#1) pg. 66
Using a tape recorder to send out your CQ.
ELECTRONICS ILLUSTRATED Mar 1965 (v.8#2) pg. 77
One-tube electronic keyer produces perfect dahs and dits. Est. cost: $20.
ELECTRONICS ILLUSTRATED May 1965 (v.8#3) pg. 93
Code practice oscillator fits into a plastic aspirin bottle.
ELECTRONICS ILLUSTRATED Nov 1968 (v.11#6) pg. 40
Continuity tester has an audible alarm to indicate complete circuit. Can also be used as a code practice oscillator. Est. cost: $8.
ELEMENTARY ELECTRONICS Jan-Feb 1967 (v.3#3) pg. 88
Beginner's code practice oscillator circuit.
ELEMENTARY ELECTRONICS Nov-Dec 1969 (v.9#2) pg. 83
Circuit for a code practice oscillator.
ELEMENTARY ELECTRONICS Mar-Apr 1971 (v.11#1) pg. 52
Code practice oscillator is quick and easy to build. There are four output jacks for feeding phones or speakers.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 43
Code practice oscillator circuit.
HANDS-ON ELECTRONICS Jul-Aug 1986 (v.3#4) pg. 88
Circuit for a simple code practice oscillator.
HANDS-ON ELECTRONICS Nov 1986 (v.3#6) pg. 27
Tone-modulated transmitter. Use it as a hidden transmitter for kids to track down using a portable radio. Use it as a code-practice oscillator.
HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 88
World's simplest code practice oscillator uses only a speaker, telephone carbon mike, battery and key.
HANDS-ON ELECTRONICS May 1987 (v.4#5) pg. 92
Code-practice oscillator circuit can also be used as a doorbell or continuity checker.
HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 96
Off-air keying monitor tells you what your morse signals really sound like to other hams.
HANDS-ON ELECTRONICS Jul 1988 (v.5#7) pg. 45
Code-practice oscillator circuit consists of only five components and feeds 8-ohm headphones.
HANDS-ON ELECTRONICS Jan 1989 (v.6#1) pg. 26
Sophisticated code practice oscillator has individually adjustable dit, dah and space duration controls. Works on a 6- or 9-volt battery. Est. cost: under $10.
MODERN ELECTRONICS [1] Feb 1978 (v.1#1) pg. 47
Added Info MODERN ELECTRONICS [1] Jun 1978 (v.1#4) pg. 8
Build a code practice oscillator and paddle key, with automatic keying. Push the key one way to send dits and the other way to send dahs. The electronic circuitry will automatically send a string of either dits or dahs as long as you hold the paddle against the appropriate contact. Est. cost: $17.
MODERN ELECTRONICS [1] Mar 1978 (v.1#2) pg. 70
A multi-function oscillator circuit uses two transistors. Applications include a code-practice oscillator, lamp and LED flashers, audio oscillator, dc-to-dc upconverter, relay control, and pulse generator.
MODERN ELECTRONICS [2] Jul 1985 (v.2#1) pg. 62
Code-practice oscillator circuit utilizes a battery-powered piezoelectric sound generator to drive an external key and headphones.
MODERN ELECTRONICS [2] Jan 1991 (v.8#1) pg. 54
Transistor CPO circuit.
POPULAR ELECTRONICS [1] Jan 1964 (v.20#1) pg. 70
Loudspeaker code practice oscillator from any receiver.
POPULAR ELECTRONICS [1] May 1964 (v.20#5) pg. 42
Short-range CW transistorized transmitter doubles as a CPO.
POPULAR ELECTRONICS [1] May 1964 (v.20#5) pg. 89
CPO features fluorescent lamp which lights.
POPULAR ELECTRONICS [1] Aug 1964 (v.21#2) pg. 55
Two-transistor, multivibrator CPO circuit.
POPULAR ELECTRONICS [1] Sep 1964 (v.21#3) pg. 78
Device converts blinker light signals into audible dots and dashes to get higher code speed and one-man operation.
POPULAR ELECTRONICS [1] Jun 1966 (v.24#6) pg. 74
Tips on correct sending techniques with a key.
POPULAR ELECTRONICS [1] Jul 1966 (v.25#1) pg. 68
Multi-master. Solid-state multivibrator module is used in this tester which generates a 1000-Hz tone, richly endowed with harmonics. Can be used as a signal generator, code practice oscillator, and continuity tester. Est. cost: $5.
POPULAR ELECTRONICS [1] Jan 1967 (v.26#1) pg. 75
Compact, inexpensive keying monitor.
POPULAR ELECTRONICS [1] Feb 1968 (v.28#2) pg. 59
Code practice oscillator uses two transistors.
POPULAR ELECTRONICS [1] Mar 1968 (v.28#3) pg. 85
Batteryless CW monitor uses a code practice oscillator.
POPULAR ELECTRONICS [1] Jul 1968 (v.29#1) pg. 40
Circuit for an inexpensive code practice oscillator.
POPULAR ELECTRONICS [1] Jul 1968 (v.29#1) pg. 68
Basic blocking oscillator circuit can serve as (1) code practice oscillator, (2) continuity tester, (3) metronome, (4) audio test signal source, (5) alarm signal and (6) basic electronic organ.
POPULAR ELECTRONICS [1] Jan 1970 (v.32#1) pg. 99
Circuit where switching arrangement allows wide-range relaxation oscillator to operate as (1) electronic organ, (2) metronome, (3) thermometer, (4) code practice oscillator, or (5) siren.
POPULAR ELECTRONICS [1] Jun 1970 (v.32#6) pg. 80
Simple audio generator circuit can also be used as a code-practice oscillator or audio transistor tester by substitution.
POPULAR ELECTRONICS [1] Jan 1974 (v.5#1) pg. 67
More circuits using the 555 IC timer include (1) tone generator, (2) code practice oscillator, (3) CW monitor and (4) electric-eye annunciator.
POPULAR ELECTRONICS [1] Jul 1974 (v.6#1) pg. 50
General-purpose audio oscillator can serve as (1) a code-practice oscillator, (2) self-contained audio source for testing microphones and loudspeaker placement or (3) as a signal in an alarm system.
POPULAR ELECTRONICS [1] Sep 1974 (v.6#3) pg. 81
Circuit for a low-cost beat oscillator that can attach to any AM-FM-Shortwave receiver.
POPULAR ELECTRONICS [1] Feb 1975 (v.7#2) pg. 17
A simple electronic keyer for sending morse code. Features a variable speed rate and a side-tone oscillator with volume control.
POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 44
Morse-A-Letter decoder. This device automatically decodes Morse transmissions and displays them alphanumerically, one letter at a time. Est. cost: $120.
POPULAR ELECTRONICS [1] Jan 1977 (v.11#1) pg. 37
Added Info POPULAR ELECTRONICS [1] May 1977 (v.11#5) pg. 64
The Morse-A-Word. Part 1. LED readout displays from 2 to 8 simultaneous letters or numbers when Morse code is received. Est. cost: $150 up. Theory and system operation.
POPULAR ELECTRONICS [1] Mar 1979 (v.15#3) pg. 35
Correction POPULAR ELECTRONICS [1] May 1979 (v.15#5) pg. 6
Morse-A-Word. Part 2. Construction, alignment and use.
POPULAR ELECTRONICS [1] Apr 1979 (v.15#4) pg. 57
Build a Morse-A-Keyer. Part 1. Keyboarded messages are converted into perfectly formed Morse characters. Sidetone oscillator lets the user hear the generated Morse code. Est. cost: $70.
POPULAR ELECTRONICS [1] Jan 1981 (v.19#1) pg. 61
Build a Morse-A-Keyer. Part 2.
POPULAR ELECTRONICS [1] Feb 1981 (v.19#2) pg. 83
Ultrasonic CW transceiver makes learning Morse code more interesting. The transceiver operates up to 200 ft., requires no license, and has built-in features which simulate using a real amateur-radio transmitter.
POPULAR ELECTRONICS [2] Jul 1990 (v.7#7) pg. 55
LED indicator circuits for all occasions. (1) AC pilot light. (2) DC pilot light. (3) Polarity indicator. (4) 5-volt voltage-level indicator. (5) Oscillator-driven flasher. (6) Decoder converts audio CW code into visual dots and dashes.
POPULAR ELECTRONICS [2] Oct 1991 (v.8#10) pg. 82
Circuits based on the LM3909 oscillator/flasher IC. (1) Dual LED driver. (2) Tick circuit flashes an LED and gives out a sharp tick on a speaker. (3) Variable audio-frequency oscillator. (4) Electronic siren. (5) Code-practice oscillator. (6) AC lamp flasher.
POPULAR ELECTRONICS [2] May 1993 (v.10#5) pg. 70
A mixed collection of practical 555-timer IC application circuits. (1) Schmitt-trigger converts sinewaves into squarewaves. (2) Dark-activated relay switch can control lighting. (3) Code-practice oscillator. (4) Electronic door buzzer. (5) LED flasher. (6) Long-period timers.
POPULAR ELECTRONICS [2] Jun 1993 (v.10#6) pg. 62
Build a Sideswiper, the first of the high speed code keys.
POPULAR ELECTRONICS [2] Oct 1993 (v.10#10) pg. 48
Using a single special-purpose IC (the ULN2429A fluid detector) in as many applications as possible. (1) Low-level liquid level detector. (2) High-level liquid level detector. (3) Touch-activated switch. (4) Proximity sensor. (5) Ultrasonic pest repeller. (6) Variable square-wave generator. (7) Code-practice oscillator. (8) Alarm circuit. (9) Light beam circuit (LED-emitter / phototransistor-sensor circuit).
POPULAR ELECTRONICS [2] Jun 1994 (v.11#6) pg. 76
More ultrasonic circuits. (1) CW (Morse code) transmitter. (2) Motion detector. (3) Proximity detector.
POPULAR ELECTRONICS [2] Jan 1995 (v.12#1) pg. 71
Correction POPULAR ELECTRONICS [2] Apr 1995 (v.12#4) pg. 4
Versatile code practice oscillator circuit has a variable frequency and volume controls.
POPULAR ELECTRONICS [2] Nov 1995 (v.12#11) pg. 81
Morse-code oscillator circuit.
POPULAR ELECTRONICS [2] Jul 1996 (v.13#7) pg. 65
Code-practice oscillators. Five different circuits supplied.
POPULAR ELECTRONICS [2] Apr 1997 (v.14#4) pg. 65
Ham radio code filter. An audio filter for making the Morse code station you want to hear stand out from those you don't.
POPULAR ELECTRONICS [2] Oct 1997 (v.14#10) pg. 44
Versatile electronic keyer provides adjustable speed from 8 to 40 words per minute. A built-in monitor provides a clear side-tone to a speaker.
POPULAR ELECTRONICS [2] Jan 1998 (v.15#1) pg. 72
Added Info POPULAR ELECTRONICS [2] Oct 1998 (v.15#10) pg. 55 (Improved side-tone circuit)
Experimenting with the 4093 NAND Schmitt trigger. Circuits include oscillator, signal injector, fluorescent-light inverter, fluorescent flasher, Morse code sender, beep-tone generator, LED flasher, and timer.
POPULAR ELECTRONICS [2] Feb 1998 (v.15#2) pg. 50
Circuit for an independent code-practice oscillator.
POPULAR ELECTRONICS [2] Oct 1998 (v.15#10) pg. 55
A five-way radio breadboard includes a wireless mike, touch alarm, code transmitter, phono oscillator, and AM receiver.
POPULAR MECHANICS Apr 1965 (v.123#4) pg. 196
Make your own code practice oscillator from Mallory SC628 Sonalert sounder and a 9-volt battery.
POPULAR MECHANICS Jan 1972 (v.137#1) pg. 99
Circuit for simple Morse bug has a speed range from about 10 to 30 wpm.
POPULAR MECHANICS Sep 1973 (v.140#3) pg. 24
External beat frequency oscillator for use in copying from Morse code stations.
POPULAR SCIENCE Aug 1973 (v.203#2) pg. 100
DTMF (dual-tone multi-frequency) encoding and decoding. How to use "Touch-Tone" techniques to speed up signal transmission.
RADIO-ELECTRONICS Dec 1986 (v.57#12) pg. 65
All-electronic T/R switch for instant break-in during pauses in CW transmissions. You monitor your receiver all the time. Est. cost: $8.
RADIO-TV EXPERIMENTER #806 Oct-Nov 1966 (v.21#2) pg. 47
A modulator keying monitor and code practice oscillator. Est. cost: $5.
RADIO-TV EXPERIMENTER Aug-Sep 1967 (v.23#1) pg. 49
Short-range AM transmitter for practicing Morse code transmitting. Est. cost: $4.
RADIO-TV EXPERIMENTER Feb-Mar 1969 (v.26#1) pg. 46
Continuity tester can also be used as a code practice oscillator. Est. cost: $4.
SCIENCE & ELECTRONICS [1] Oct-Nov 1970 (v.28#5) pg. 73
Simple code monitor has no electrical connection to equipment. It is triggered by a separate set of contacts activated by transmitter key.
SCIENCE & ELECTRONICS [1] Dec 1970-Jan 1971 (v.28#6) pg. 66
Wooden board with several battery holders and some wiring can serve as a low-voltage power supply, a continuity checker, a bulb tester, a code practice blinker, etc. Est. cost: $2.
SCIENCE & MECHANICS May 1968 (v.39#5) pg. 66
Battery-powered code monitor allows sender to hear the code being transmitted.
SCIENCE & MECHANICS May 1968 (v.39#5) pg. 88