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Cable Banana Socket with LED indicator
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Cable Banana Socket with 3 mm LED indication of voltage presence and correct polarity
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Updated at source:
Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution — Noncommercial
BOM (Bill of Material)
- Cable - black-red: https://www.tme.com/us/en-us/details/tas-c102-0.75/speaker-cables/tasker/c102-0-75/
- Banana socket on panel - red: https://www.tme.com/us/en-us/details/bs-324-lg-r/4mm-banana-sockets/
- Banana socket on panel - black: https://www.tme.com/us/en-us/details/bs-324-lg-b/4mm-banana-sockets/
- LED - 3 mm, red: https://www.tme.com/us/en-us/details/l-937iid/tht-leds-3mm/kingbright-electronic/
- Do not forget the ballast resistor for the LED (e.g. https://www.tme.com/us/en-us/details/mp0.6w-1k/0-6w-metal-film-tht-resistors/royal-ohm/mf006bb1001a10/), but the value depends on your max. voltage (see below)
How to choose the right Ballast resistor for the LED
If you buy recommended LED from the BOM, parameters for formula are:
- V_LED (forward voltage) = 2.5 V
- I_LED (forward current) = 20 mA.
Example: When your Source Voltage has maximum at 24 V so it is R = (24 - 2.5) / 0,02 = 1075 = ~1 kΩ Ballast resistor.
Examples for other voltages with the same LED
| Vs [V] | R [Ohm] | Resistor from E12 series 5 % [Ohm] |
|---|---|---|
| 3.3 | 40 | 39 |
| 5 | 125 | 120 |
| 8 | 275 | 270 |
| 10 | 375 | 390 |
| 12 | 475 | 470 |
| 15 | 625 | 560 |
| 18 | 775 | 820 |
| 24 | 1075 | 1000 |
| 30 | 1375 | 1500 |
Wirings
Pretty simple, just check polarity of the LED.
Assembly
Just few drops of Super Glue to side of panel.