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voice_keyer_for_radio_amateur_station [2018/02/03 17:58] (current)
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 +
 +objective
 +
 +  *     to save voice and energy during contests
 +  *     to learn analog to digital conversion (ADC) and digital to analog (DAC), set up interface development environment for AVR
 +
 +specification
 +
 +  *     AVR based
 +  *     keep simple
 +  *     ​upgradable
 +
 +components
 +
 +  *     refer to Atmel'​s document AVR335: ATMEGA 8535 and AT45DB161D
 +
 +dates
 +
 +  *     2014 04 idea came during CQ WPX SSB contest @OG2K (home)
 +  *     2014 07 started
 +  *     2014 09 aim to finish
 +  *     2015 04 delay
 +
 +progress and what I have learnt?
 +
 +  *     2014 07 components arrived
 +  *     2014 07 22 PCB planned
 +  *     2014 07 23 PCB etched
 +  *     2014 07 23 pcb "voice keyer 2014 07 15 - V1.2 OG2K" produced, front and back copper layers where shifted 0,5 mm, I decided to rethink practise of transferring prints to copper.
 +  *     2014 07 30 pcb "voice keyer 2014 07 15 - V1.3 OG2K" produced
 +    *         usage of kicad/​freeroute
 +    *         ​homemade vias should be of cable diameter
 +    *         ​homemade double side pcb' print transfer to copper
 +    *         ​kicad/​new modules
 +    *         less use of drill-through elements
 +    *         ​kicad/​eeschema use of "​HOLE"​ element and "​HOLE1mm",​ "​HOLE4mm"​ for making mechanical holes in PCB
 +  *     2015 04 12 pcb "voice keyer 2015 04 12 - V1.4 OG2K" planned
 +    *         ​produce PCB which will be suitable for case
 +    *         do not put vias under components
 +    *         use soldering pads instead of pins, if possible
 +    *         use standard ISP 2x3 pin-out
 +    *         ​produce single side PCB, if there are not any components on second side - use wires to compensate copper tracks
 +    *         ​double check components'​ sizes with ruler and "PCB check & assembly document"​
 +
 +{{::​vk1:​p4120006.jpg|}}
 +
 +{{::​vk1:​p8150002_resized1920.jpg|}}
 +
 +{{::​vk1:​p8150003_1_resized.jpg|}}
voice_keyer_for_radio_amateur_station.txt ยท Last modified: 2018/02/03 17:58 (external edit)