Read first! I am no longer building this transceiver. Please check other interesting projects from Farhan on the discussion group, like HF-1 Transceiver, the replacement of the Minima and some cool RF jigs, Specan and Sweeperino. Also, since I’ve lost from both server and my drive the Eagle files of the PCBs, they will be no more available. Minima has become discontinued, check the group for more details. I will still keep the pdf files here for download for anyone still interested in hacking the rig.
These days I did a little work in Eagle on the PCBs design for Farhan’s new Minima Transceiver. As suggested on the discussion group, I split up in two boards, actually three (one optional) as described:
– one PCB for the LCD, Arduino and Si570;
– the Main Board, with the rest of components;
– an optional small board with the PC serial interface.
Here you can download the pdf file with all the three boards, set as A4 paper format, 1:1 scale. NOTE: the drawings are mirrored, ready to use for Press and Peel PCB making.
Eagle CAD files Sorry, but the Eagle files are no longer available. Download CAD archive file.
Some remarks regarding what components are used:
– resistors have 5 mm grid (suitable for 1/4-1/8W miniature resistors, or 1/4 and up, mounted vertically);
– fixed caps have 5 mm grid, electrolytics 2.5 mm;
– capacitors at the crystal filter are SMD 1206;
– relays: SPDT are Omron G5V-1 12V (or cheaper types: RSY-12, RSM957-P-12) and DPDT are Omron G5V-2 12V (cheaper RS-12 etc.);
– for fancy homebrewers, SMA pcb connectors to Si570 and power amplifier/LPFs. Can be omitted, you can simply solder a small coax into the holes;
– TZ03 small type trimmers. Optional holes on the board for three pin small package trim cap.
Good luck homebrewing!
PCB boards revised 31.01.2014
Based on the discussions from Minima group I made a new version of the boards with bigger pads, the holes are now 0.8 mm (1/32″), in some cases 1mm (trimmers, pinhead etc), option for three pins small package trim caps, more ground plane.
Update on 09.04.2014, Errata: the 4k7 resistor from the base of Q23 is missing on both PCBs layouts. You either cut the trace on the main board and drill two holes or place a SMD type, or mount it on the digital board in place of the jumper below the crystal (in this last way, the PTT and R/T pins marked on the silkscreen will be reversed).