update readme

.gitignore

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+## ignore kicad backup files
+ pcb/swmeter-backups/

README.md

@@ -16,43 +16,49 @@ Have fun and 73 :)
 
 ## HARDWARE
 
-- 1x Custom THT PCB (B) 66 x (L) 60 x (H) ~2 mm + 15 mm parts 
+- 1x Custom THT PCB: (B) 66 x (L) 60 x (H) ~2 mm + ~15 mm part height
 
  by WodoWiesel ([email protected])
 
-- 1x BNC male connector 50 Ohm Impedance + 1x T-Adapter for antenna/transceiver
+- 1x BNC male connector 50 Ohm Impedance
 
-- 1x 3.5 or 2.5 mm audio jack female connector
+- 1x T-Adapter/cable for antenna/transceiver
 
-- 1x +9V Block Battery + 1x click connector
+- 1x 3.5 or 2.5 mm audio jack female connector incl. a cable for hook up to your radio
+
+- 1x +9 V Block Battery + 1x click connector
 
 - 1x 330 Ohm Resistor – for reference voltage adjustment
 
-- 2x Variable Trimmer resistors 3-pin ~4.7 kOhm
+- 2x Variable Trimmer resistors 3-pins ~4.7 kOhm
 
-- 1x Capacitor ~22 µuF (pol.)
+- 1x Electrolytic Capacitor ~22 µF (pol.)
 
 - 1x 2-pos. DIP-switch for additional signal/graph modes
 
 - 1x On/Off-switch
 
 - 1x 2/3-pos. 3-pin switch - for Input selection
 
-- 1x Female Pin Headers/Socket - recommended
+- 2x DC-Volt-Meters 3-pins
 
-- 2x DC-Volt-Meters 3-pin
+- 1x Female Pin Headers/Socket - recommended for driver chip
 
 - 1x LM3914 (linear), or 3915/16 (logarithmic dB) dot/bar display driver from Texas Instruments
 
-- 1x 1N914 Diode - to prevent backflow
+- 1x 1N914 fast-switching Schottky Diode - to prevent backflow
 
 - 10x LEDs or 1x Bargraph
 
-- 1x M3 short flat screw
+- 1x M3 short flat head screw
+
+- maybe metal case or 3D printed enclosure for isolation
 
 - 1x Soldering iron & Screwdriver
 
-- Solder + flux + IPA + brush
+- Solder + flux + IPA + brush + paper
+
+- Multimeter/Oscilloscope for verification
 
 ## Credits