Custom PCB design of an external S-&Watt-Meter for radios. Useful for all radio enthusiasts and amateur HAM operators.
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 :)
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1x Custom THT PCB: (B) 66 x (L) 53 x (H) ~2 mm + ~15 mm parts height
by WodoWiesel ([email protected])
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1x BNC male connector 50 Ohm Impedance
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1x T-Adapter/cable for antenna/transceiver
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1x 3.5 mm (or 2.5) audio jack female connector incl. a cable for hook up to your radio
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1x +9 V Block Battery + 1x click connector
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1x 330 Ohm Resistor – optional for LED
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3x Variable Trimmer resistors 3-pins (1x1.2k & 2x4.7 kOhm)
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1x Electrolytic Capacitor ~22 µF (pol.)
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1x 3-pos. DIP-switch for additional signal/graph modes
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1x On/Off-switch
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1x 2-pos. 3-pin switch - for Input selection
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2x DC-Volt-Meters 3-pins
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1x Female Pin Headers/Socket - recommended for driver chip
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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)
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1x 1N914 fast-switching Schottky Diode - to prevent backflow
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10x LEDs (v0.5) or 1x Bar-Graph (v0.7)
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1x M3 short flat head screw
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maybe metal case or 3D printed enclosure for isolation
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1x Soldering iron & Screwdriver
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Solder + flux + IPA + brush + paper
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Multimeter/Oscilloscope for verification
©️ 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
This project is licensed under:
CERN Open Hardware License Version 2 - Weakly Reciprocal
Short identifier CERN-OHL-W-2.0