IAMBIC KEYER
| COMPONENT |
VALUE |
| R1,R2 |
100K |
| R3,R4,R5,R6 |
5K1 |
| R7 |
1K2 |
| C1,C2 |
0.01 mFd |
| C3 |
470 pF |
| C4 |
47 mFd |
| ZD |
5V1 |
| T1 |
BC547 |
| IC1 |
PIC16F84 OR PIC16C84 |
| D1 |
1N4007 |
| P1 |
22K |
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 (see circuit below.)
You can download the pic program source code here: iambic.asm
IAMBIC KEYER PCB.
IAMBIC KEYER PCB LAYOUT (GIF)
Download PCB layout as a Postscript file: key_pcb.zip
KEYER COMPONENT OVERLAY (VIEW FROM COMPONENT SIDE)
USING A RELAY TO KEY THE TRANSMITTER
FINISHED PCB
EI9GQ homebrew radio page
