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How do LED keychain flashlights get away with no dropping resistor?

The main reason is that the "coin" cells these flashlights use have enough internal resistance to ...

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| SEVEN SEGMENT LED | DOT MATRIX LED | LED DIODE | LED CLUSTER | LED BAR | LED STRIP | LED LIGHTING

| power LED | Oval LED | MULTI-COLOR LED | BLINKING LED | IR LED | PHOTO DIODES | SMD LED | PIRANHA LED | SUPER BRIGHT LED | LED bullet

| 3mm PD | 4mm PD | 5mm PD
Total:360 itemes

PICProductSizeP/N datasheet
3522 Silicon Photo Diodes
3522 Silicon Photo Diodes3.0 x 5.1 x 7.4mmBL-L3522PD
4802 Silicon Photo Diodes
4802 Silicon Photo Diodes3.8 x 5.0 x 6.5mmBL-L4802PD
512(5mm) Silicon Photo Diodes
512(5mm) Silicon Photo Diodes5.0 x 7.6mmBL-L512PD

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photo diodes, infrared diode

Betlux IR LED including a broad range of discrete Infrared Diodes components for applications such as remote control, IR wireless data transmission, security alarm and PC mouse. Product features include high power, high speed, wide viewing angles, high signal-to-noise ratio and UL safety approval. Chip materials include GaAs 940nm, AlGaAs high power 880nm, AlGaAs high speed 875nm/850nm. Photodiodes and Phototransistors with filter are also available to reduce ambient light noise or enhance signal-to-noise ratio.