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
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