Terry
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Terry 19/07/2022
This is a pleasant wind chime. When it arrived, the string that it hangs from came untied, I was able to tie it again easily and I love the music it makes in the breeze.
PATHONOR Windspiele mit 6 Aluminiumrohren Holzwindglocke Memorial Windspiele Bestes Geschenk Glockenspiel Dekor für Garten Terrasse Outdoor
US$17.31 US$17.99
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Terry 25/04/2022
The item arrived quicker than I expected. The packaging was good and it is a good-looking device. However the 48-volt power supply adapter did not work (voltage output was near zero), and rattled when it was shaken. I opened the adapter and found that a coil had not been soldered to the circuit board and was loose inside the plastic housing. The circuit board was well-labeled and I soldered it into it's proper place. I also re-soldered a couple of "cold" solder joints. When I tried it again after making the repair, it worked and the Tesla coil operates as described. The spark is bright yet safe to touch. The music mode plays via bluetooth, and the sparks' intensity matches the music. The sound is very buzzy, like heavy static. I suspect that some songs will sound better than others, as the crackling and buzzing noises drown out some of the subtle nuance of the music. Still, it's a great conversation piece and a demonstration of Nicolai Tesla's idea (which was to transmit power to consumers without needing wires.)
Stark Long Arc und Bluetooth Musik Dual Mode Musik Tesla-Spule Palm Flash Bluetooth Flash Länge 10CM Wissenschaftsspielzeug
US$80.49 US$99.99
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LUSTREON 10W COB LED-Chip DC12V Warmweiß / Kaltweiß 120x10mm für DIY-Lampe
US$9.23 US$9.99

Q: Do these need a current-limiting resistor?

gefragt von Terry auf 2017-11-09 03:20:37

BG351738321 hi, i've got a Lipo 12V 8000mah, it works but it heats. Wishing you all the best.

2022-02-08 01:12:55 Hilfreich (0)
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Terry 28/01/2018
Incredibly thin, lightweight, fits in backpack with notebooks. Has variable brightness, easy to use. If you need a lightpad, this one is recommended. Good for tracing drawings or viewing photographic negatives.
Ultradünne USB A4 LED Licht Copyboard Zeichnung Pad Tracing Light Box
US$18.99
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