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Code Practice Circuits
Last Updated on: Monday, March 09, 2015 04:11 AM


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

1 watt Morse transmitter -  Schematic only, no circuit description
2 Way Morse Practice Set -  (electronic schematic / circuit added 4/02)
2-way Morse practice set -  amateur radio construction projects…. [from Peter Parker's website]
30 Meter QRP Transmitter for Morse Code -  It is a low-power QRP type and needs to be connected to your existing tranceiver.  harmonic rejections on  prototype were measured at 40dB on 20Mhz and 50dB on 30Mhz.... [Tony van Roon's circuit]
A two-way Morse practice set -  amateur radio construction projects…. [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…
AVR Beacon Super Keyer -  The keyer will send both "Normal" and "DX mode" Feld-Hell, at the standard 122.5 bits/second, as well as half-speed, quarter-speed and eigth-speed. The slower speeds are less affected by multi-path, and are also less affected by noise.....(electronic circuit added 6/07)
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]
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 don’t 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 it’s very clumsy, and the transmitted tone is likely to be harsh.  Clearly something better is needed…. [from Peter Parker's website]
Morse Beacon -  The beacon powers up in one of two states, depending on whether it detects a serial lead on its serial port connection. If a serial lead is detected then programming is permitted using a one way connection at 600 baud, 8 data bits, no parity and one stop bit (this rather archaic choice of baud rate being entirely down to the speed of the PIC’s EEPROM!) If no serial lead is....(added 04/04/04)
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 -  Shematic 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.. (added 9/04)
Morse Monitor -  Electroinic circuit design…. [from Harry Lythall's website]
Morse Paddle Keyer -  Electroinic circuit schematic…. [from Harry Lythall's website]
Morse practice oscillator -  Schematic only, no circuit description
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]
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,.....(design idea added 08/08/08)
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 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….(schematic design added 08/08)
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.. (added 9/04)
Two Way Morse Practice Set -  (electronic schematic / circuit added 10/04)
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]

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