Keyer project is started because it is difficult to find cheap Electronic Keyer in Indonesia. After searching references, I found that PIC16X84 is easier to realize since I don't need to use Crystal as clock source.
I try to port the code to more cheaper microcontroller chip such as ATMEL 89C51, but I found this ATMEL chip is difficult to implement. ATMEL programmer is quite complex compared to PIC. May be I should choose simpler ATMEL chips like ATMEL 89C2051. But then PIC has better hardware to support the purpose.
If you have trouble to access to the parts or do not want to build the PCB yourself, perhaps I can help with that.
Hopefully with this simple electronic keyer, the world of CW can grow faster in YB land.
8/20-2001
PIC Freq Counter schematic is updated with new version. The newer Counter use
ULN2003A to drive the 7-Segment. It eliminates the bulk resistor and transistor.
But then since ULN2003A is an active high device, the output from 74LS138 needs
to be inverted using another 74LS540. May be a better chip (74LS238) can be used
since it is active high output. I din't choose it because it may be difficult to
get the chip here.
8/26-2001
PIC Programmer is added on the resource page. Sorry, some component are not
assigned with their values. But you can easily assign them, it should be 4k7 resistor
in R2 and R4. Please email if something else is missing.