On-Line Amateur Radio Tuition Courses / Home Study Courses

Brats club logo

Bredhurst Receiving and Transmitting Society

Construction Part 2

Practical 9.

Construction Morse oscillator

Disclaimer If you build this project, as the course writers and publishers have neither control over its construction nor use, the responsibility for ensuring that it is suitable for your needs rest solely with you and the course writers and publishers cannot be held responsible for damage to equipment connected to the unit howsoever caused.

morse oscillator

The diagram shows the over lay of the pcb for the morse oscillator project.

When you have gathered together all the parts you must ensure that you have identified them correctly and their respective positions on the board. It is much easier to move a component on the board BEFORE you have soldered it into place than to have to remove it from the board and relocate.

Note that in addition to the parts there are two wire links on the board and 7 that come from the board to external components.

click here for larger image of the board.

Component list

Resistors Capacitors Semiconductors

Value
Required
Value
Required
Type
Required

8R2

3

22n

1
NE 555
1

10R

1

47n

1
LM 383
1

1k

1

0.1uf electrolytic

1

10k

2

0.47uf electrolytic

1

5k6

3

2.2uf electrolytic

1

270k

1

22uf electrolytic

1

22k hoz var

1

470k var pot

1

This project is one where you do not need an on off switch as the morse key acts as the on off switch when used in the single operation mode. The additional 5k6 and 8R2 resistors act as the feed from two other "stations". Details of the complete set up will follow soon.