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Code Practice Circuits
Last Updated on: Friday, August 21, 2015 06:59 AM

 

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

1 Watt Morse Transmitter -  Schematic only, no circuit description included. . .  [CircuitoZ.net, contact Ruddy]

 

2 Way Morse Practice Set -  The first step to learning Morse is to be able to memorise the sounds of all letters and numbers. This can be accomplished with the help of Morse practice tapes or classes. Once you know all the characters, the WIA Morse practice broadcasts and/or continuous VHF Morse beacons can be used to increase your receiving speed. . . .  [by Peter Parker VK3YE-first appeared in Amateur Radio, April 1998]

 

2-way Morse practice set -  The first step to learning Morse is to be able to memorise the sounds of all letters and numbers. This can be accomplished with the help of Morse practice tapes or classes. Once you know all the characters, the WIA Morse practice broadcasts and/or continuous VHF Morse beacons can be used to increase your receiving speed. . . .  [from Peter Parker's website]

30 Meter QRP Transmitter for Morse Code -  This transmitters' intended purpose is for morse-code only in30 meter band (Tony van Roon's 10Mhz). It is a low-power QRP type and needs to be connected to your existing tranceiver. harmonic rejections onprototype were measured at 40dB on 20Mhz and 50dB on 30Mhz. . .  [Tony van Roon's circuit]

 

7MHz CW/AM QRP Transmitter -  This circuit can be used for either amplitude modulation (AM) or CW operation at 7 MHz by simply keeping a switch on or off for choosing any one between them. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

7MHz QRP Transmitter -  This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some years agon. Today I would not build a transceiver like I did then, but it was working, so I have kept this page for historical (and sentimental) reasons. If you are a beginner in building you own transceivers you might be able to steal a few of my ideas. Please let me know if you do a full copy of the design, I would be interested in you practical experiences when operation on the air. . . .  [Herbert Dingfelder's web site]

 

A Two-Way Morse Practice Set -  The first step to learning Morse is to be able to memorise the sounds of all letters and numbers. This can be accomplished with the help of Morse practice tapes or classes. Once you know all the characters, the WIA Morse practice broadcasts and/or continuous VHF Morse beacons can be used to increase your receiving speed. . . .  [from Peter Parker's website]

 

A Visual CW Zero Beating Aid -  The few components required are shown in the accompanying diagram, and also listed below with RADIO SHACK part numbers. R2 sets the decoder frequency. A 35mm film container was used as the housing for the indicator. . . 

 

Computerised Morse Code Generator Transmitter -  This is a circuit for a computerised telegraph which can transmit telegraph messages. The data entered through keyboard is converted into Morse code into computer using the Pascal program code given here. Then, this signal is transmitted in the form of a FM signal that can be received by any receiver tuned to the frequency of the signal being transmitted. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

CW Tone Keyer -  Recently, I received email from an amateur wishing to key his transmitter from the tone output of a Morse Code generator program. Although it is possible to connect to a COM port on the back of a PC using a diode-transistor configuration, this results in another precious COM port being used up. The tone keyer is an ideal alternative and works very well. . . .  [Radio Amateur Society of Norwich]

 

Easy FM Keyer -  Many no code Technician class amateurs who are struggling to learn 5 WPM code simply do not have any avenue to get the necessary on the air practice. Figure 1 is a simple circuit which will generate a 700 Hz tone into any FM transceiver allowing an amateur to practice CW with another amateur on a 2 meter simplex frequency. . .  [Radio Amateur Society of Norwich]

 

Easy Morse Code Keyer -  For those amateurs who are planning to learn their code and upgrade, some type of on the air experience is virtually essential for the higher code speeds. This means a paddle is needed as well as some type of keying circuit to drive it. The circuit in figure 1 is based on the famous Curtis family of morse keyer chips and has a proven record of dependability. . .  [Radio Amateur Society of Norwich]

 

Iambic Keyer -  This iambic keyer uses a PIC16C84 or PIC16F84 microcontroller to generate the dot/dash timing and key the transmitter. Most modern rigs are keyed by grounding the key line. The maximum current on the keying line is usually no more than a few mA. If your transmitter has high voltage or high current on the keying line, you will need to use a relay to key the rig. . .  [EI9GQ homebrew radio]

 

Morse Adaptor for your VHF/UHF FM rig -  Everyone knows that the best way to practice Morse is to use it on the air. But how do you send Morse if you donít have a multimode HF or VHF transceiver?Well, you could hold a microphone up to a code practice oscillator, and hold the PTT down while pressing the key, but itís very clumsy, and the transmitted tone is likely to be harsh. Clearly something better is needed. . . .  [from Peter Parker's website]

 

Morse Code Beacon Keyer -  This circuit stores a single morse code message as bits in an EPROM chip, the message is sent to a relay which can key a CW transmitter. The keyer can output either a one-shot message such as "CQ DX DE CALLSIGN", or a continuous message. The continuous mode is useful for making beacons for low power (QRP) and slow (QRSS) transmissions. . .  [Designed by G. Forrest Cook]

 

Morse Code Display -  Schematic only, no circuit description given. . .  [Jon Fick]

 

Morse Code Practice Keyer 2 -  The speaker (LS1) can be any 8-ohm type up to 2-watts. Supply voltage for this circuit is up to 15 volts, but 12V is more desirable if you choose to go with an adapter. If possible, try to use a mylar or polyester kind of capacitor for C2. . .  [Tony van Roon's circuit]

 

Morse Code Practice Oscillator -  The speaker (LS) can be any 8-ohm type up to 2-watts. C1 and C2 are ceramic capacitors. C3 is an electrolytic type. IC1 is a CMOS MC1455P or equivalent. The cmos type consumes a lot less current when used with the 9-volt battery, but if you don't want to spent the money then the LM555, NE555, etc. are fine too and are pin-for-pin compatible with each other. . .  [Tony van Roon's circuit]

 

Morse Code Tutor -  A program (23kb) written in C++. Morse code uses dot and dash for communication. Still it is popularly used for communication is short wave bands. The Archive contains program source code and executable. . . 

 

Morse Monitor -  . . .  [from Harry Lythall's website]

 

Morse Paddle Keyer -  . . .  [from Harry Lythall's website]

 

Morse practice oscillator -  Schematic only, no circuit description. . .  [Designer's name not given]

 

One Watt Morse Transmitter -  Schematic only, no circuit description included. . .  [Designer's name not given]

 

PL Tone Encoder Board -  If your local repeater has got you singing the PL tone blues, then read on. For less than $10, an inexpensive PL tone generator can be constructed that will bring new life into that old non-PL rig. . . .  [Radio Amateur Society of Norwich]

 

QRP Keyer -  very simple keyer circuit using only one transistor. . . .  [Circuit Designer's name is not listed]

 

Simple CW Keyer based on Atmel ATtiny 2313 -  This is a simple and small CW keyer project. It uses an ATMEL ATtiny 2313 (Atmel's ATtiny2313 page) microcontroller, which is a 20pin device with 2k flash memory. The firmware is written in C and uses less than 1k. The pin count would allow for the use of a 8 pin device but the 2313 was simply the part at hand. . .  [(c) 2007 Michael Wichmann]

 

Simple Electronic Keyer -  Scroll to specific circuit. A simple keyer suitable for a popcorn QRP transmitter can be built around an astable multivibrator and an example of such is shown above. The basic design of this keyer is from notes, . . . 

 

Simple Electronic Keyer  -  Serious CW operators know that a paddle is the way to go to make CW easy and fun. But along with the paddle, a certain amount of electronics is needed to produce the necessary dots and dashes. This circuit in figures 1a and 1b is a simple keyer which can be built for as little as $6 with some junk box parts. Although this circuit is not a true iambic keyer, it is capable of producing perfectly sounding CW. To make construction easy, all parts are available off the shelf at any Radio Shack store. . .  [Radio Amateur Society of Norwich]

 

Simple Morse Code Trainer -  This circuit can be used to generate audible tones using input switches. If you have a Morse code table, you can use the circuit as a Morse code contest trainer. . . .  [© EFY Enterprises Pvt. Ltd. All rights reserved.]

 

Simple Morse Practice Oscillator Circuit -  This will be my next Homebrew project, a morse practice oscillator circuit. 9W2AZV and I are going to build this as we are preparing ourselves to perfect our Morse code sending/receiving skills. In the spirit of amateur radio/ham, we will homewbrew. . . . 

 

Smooth Tone Clickless CW SideTone Generator -  This circuit is about as good as it gets for generating morse code tones. It may be used as a code practice oscillator, a tone generator for a keyer, a sidetone oscillator for a CW transmitter or an audio Modulated CW (MCW) generator for an FM transmitter or repeater. . .  [G. Forrest Cook]

 

Talking Morse Code Practice Computer -  . . .  [Ken Staton's website]

 

Touch CPO -  touch operated code practice oscillator using popular timer IC555. Practice Morse code in a different way. . . 

 

Two key projects -  This is a circuit that I particularly like due to its simplicity and speed of construction. With this circuit, it is now possible to include a paddle keyer as an integral part of all, but the smallest, of QRP CW transmitters. It also satisfies my hate for CMOS!!. . .  [Harry, SM0VPO Email: harold.lythall @ era.ericsson.se]

 

Two Way Morse Practice Set -  The first step to learning Morse is to be able to memorise the sounds of all letters and numbers. This can be accomplished with the help of Morse practice tapes or classes. Once you know all the characters, the WIA Morse practice broadcasts and/or continuous VHF Morse beacons can be used to increase your receiving speed. . . .  [by Peter Parker VK3YE-first appeared in Amateur Radio, April 1998]

 

Two-way Morse practice set -  amateur radio construction projects. The system consists of a pair of Morse practice oscillators connected by a piece of two-conductor cable (Figure One). Pressing the key on one unit produces a sound in both units. The receiving station can interrupt the sending station at any time by pressing their key. . .  [from Peter Parker's website]

 

VA3TO Programmable Beacon Keyer -  This article describes a simple programmable Morse Code Continuous Wave (CW) beacon keyer that can be built for less than $15. While older designs had the message hard-coded in a diode matrix or EPROM and other so called "programmable" designs require you to alter the microcontroller code or use some other clumsy method to change the message, this keyer design offers a much simpler programming interface using a PC. The board can be temporarily connected . . .  [from Rob Paisley's Model Train web site]


 


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