SW-Meter

Custom PCB design of an external S-&Watt-Meter for radios. Useful for all radio enthusiasts and amateur HAM operators.

DISCLAIMERS

This is still "work-in-progress (WIP)" so I do NOT take any kind of warranty/responsibility for damages or data losses!

You can use this at your own risk without any guarantees and put device on non-conductive surface or enclosure!

If you like the new design you are free to share it!

Have fun and 73 :)

HARDWARE

• 1x Custom THT PCB: (B) 66 x (L) 53 x (H) ~2 mm + ~15 mm parts height

  by WodoWiesel (wodowiesel@quantentunnel.de)

• 1x BNC male connector 50 Ohm Impedance

• 1x T-Adapter/cable for antenna/transceiver

• 1x 3.5 mm (or 2.5) 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 – optional for LED

• 3x Variable Trimmer resistors 3-pins (1x1.2k & 2x4.7 kOhm)

• 1x Electrolytic Capacitor ~22 µF (pol.)

• 1x 3-pos. DIP-switch for additional signal/graph modes

• 1x On/Off-switch

• 1x 2-pos. 3-pin switch - for Input selection

• 2x DC-Volt-Meters 3-pins

• 1x Female Pin Headers/Socket - recommended for driver chip

• 1x LM3914 (linear), or 3915/16 (logarithmic dB) dot/bar display driver from Texas Instruments

  extra calculator (https://www.electro-tech-online.com/tools/LM3914V2.php)

• 1x 1N914 fast-switching Schottky Diode - to prevent backflow

• 10x LEDs (v0.5) or 1x Bar-Graph (v0.7)

• 1x M3 short flat head screw

• maybe metal case or 3D printed enclosure for isolation

• 1x Soldering iron & Screwdriver

• Solder + flux + IPA + brush + paper

• Multimeter/Oscilloscope for verification

Credits

©️ 2022/23 WodoWiesel (https://github.com/wodowiesel/ & https://www.twitch.com/wodowiesel/)

The new design was checked by the electrical engineer theBrutzler

(https://github.com/theBrutzler/ & https://www.twitch.com/theBrutzler/)

The new optimized PCB was designed with free KiCAD software (https://www.kicad.org/)

The PCB should be produced at a manufacturer (like PCBWay) with the RoHS lead-free option for environmental protection

LICENSE

This project is licensed under:

CERN Open Hardware License Version 2 - Weakly Reciprocal

Short identifier CERN-OHL-W-2.0

LICENSE Source