EK001 CW Practice Oscillator
Part.no: 41017292
EK001 is an oscillator intended for use in morse code exercises during telegraphy training. The oscillator generates a tone as long as the telegraph key is pressed. The frequency can be adjusted from approximately 600Hz to 2000Hz using one of the potentiometers on the board. The volume is adjusted with the other. A speaker is included, but the oscillator can also be used with headphones. The switching headphone jack disconnects the speaker when headphones are connected. A suitable enclosure is available as an accessory (part no. 41011410). A dimensional drawing for drilling the enclosure is provided at the end of this manual.
Note that the telegraph key and battery are not included.
Component list
| RefDes | Value | Qty. | Part.no. | Marking |
|---|---|---|---|---|
| BAT | Battery holder 9V | 1 | 41000885 | |
| C1 | Ceramic 22nF 5mm | 1 | 40500042 | 223 |
| C2 | El.lyt 22uF 5x11mm | 1 | 40520005 | 22uF |
| R1 | Resistor 2.2kohm | 1 | 40810322 | |
| R2 | Resistor 22kohm | 1 | 40810422 | |
| U1 | Timer IC LM555 | 1 | 41015923 | LM555 |
| Speaker | Speaker 30mm | 1 | 41010430 | |
| Headphones | Jack stereo 6.3mm | 1 | 41002007 | |
| Key | Jack mono 6.3mm | 1 | 41002006 | |
| Volume | Pot 500ohm | 1 | 40910023 | B500 |
| Pitch | Pot 100kohm | 1 | 40910030 | B100k |
Assembly guide
Before starting assembly, check that the PCB is free from damage and scratches. Verify that all components to be assembled are present, compare with the component list. It is usually easiest to start assembling the lowest profile components and work upwards in size. IC sockets, resistors, ceramic capacitors and diodes are mounted first. Electrolytic capacitors, connectors and potentiometers are mounted last.
For some components, correct orientation is important. Pay attention to the markings on the PCB.
Note that there is a position on the PCB for a capacitor (C3) which is not included and should not be mounted.
Interactive assembly guide ↗
Schematic
Drill guide for panel
