I fixed a China Torch with New LEDs and a Diode, it failed probably on a drop shock, the battery wire cut … then when put on charge Few LEDs went bad, as battery was absent in ckt.
A typical Mains Powered China Lamp. On power down, LED light turns on for around 1/2 hr. Gets damaged on lightning activity and wide (uS not nS) transients above 300V. Drawing may have error.
Many products and components were made over the last 10 years with less regard to voltage and current ratings and product safety.
The circuit design is not everything, engineering the product for reliability, usability and safety is very important. This Schoodle is like a Satire to emphasize the responsibility of electronic manufacturing and engineering.
Many products and components were made over the last 10 years with less regard to voltage and current ratings and product safety.
The circuit design is not everything, engineering the product for reliability, usability and safety is very important. This Schoodle is like a Satire to emphasize the responsibility of electronic manufacturing and engineering.
Colorful Light Emitting Diodes and LED Lamps. Colorful Lights, LED Lighting, Automobile Lamps, Cycle Lights. Decorative LED Effects. Annunciations and Indicators. LEDs are Omnipresent.
Series Connected Voltage Boost Circuit
....Eventually a topology emerged that can actual run a 3.5 volt LED when it and the driver in series with a 1.5 volt flashlight cell. Well kind of, anyway. The trick was to put one additional component, a diode that is actually part of the driver, in parallel with the LED. Read on.
LED Torch Project
I looked around for an integrated LED boost driver with an input voltage of less than 4.5v and current limiting up to 1A but there appears not to be any! None that I could order from Farnell anyway. The CAT4139 and CAT4240 come close with a current handling of 750mA but Farnell do not stock them.
Solar Charged LED Utility Light
The LED array can provide enough light to illuminate a small work area or reading area at night. The red, orange, yellow and green LEDs broaden the lamp's color spectrum to produce a slighly warmer color temperature.
LED - Brooke Clarke
If the light source was another identical candle then it would be the same distance from the paper. But if a reflector was on the light source candle it could be moved further away. The light output from the T series LEDs is specified in milli candelas. A bright white LED running at 20 ma might be rated 10,000 mCd but only over a very narrow angle.
The Perfect LED Light - Garry Petrie
The perfect LED light is designed for cavers who want an efficient, uniform and constant bright light for caving. This article contains some very specific technical information and it is assumed the reader has a basic understanding of electronics. To build the light, the reader also must have some experience soldering, drilling, wiring and cutting small objects.
Pocket LED Light
This is a pocket-sized LED flashlight operating with only one AAA battery. However, the super high luminosity LEDs(blue,green or white) require at least 3.5 volts of forward voltage. This flashlight is boosting input voltage up to operating voltage of a LED with simple DC-DC converter.
Single cell LED flashlight
High efficiency white LEDs have advanced to the point where they can replace glow bulbs and other light sources not only as indicators, but also for illumination. While many of the claims made about the LEDs' efficiency, light quality, lifetime and economy are mostly exaggeration, the truth is that for very low light levels they are now competitive.
Seven Component Regulated LED Lamp
This is a minimal-parts lamp made with four white LEDs. It features regulated light output from 10V to 20V and works well as a desk lamp or flashlight. The lamp is still working perfectly 16 years after it was first built.
Series Connected Voltage Boost Circuit
....Eventually a topology emerged that can actual run a 3.5 volt LED when it and the driver in series with a 1.5 volt flashlight cell. Well kind of, anyway. The trick was to put one additional component, a diode that is actually part of the driver, in parallel with the LED. Read on.
LED Torch Project
I looked around for an integrated LED boost driver with an input voltage of less than 4.5v and current limiting up to 1A but there appears not to be any! None that I could order from Farnell anyway. The CAT4139 and CAT4240 come close with a current handling of 750mA but Farnell do not stock them.
Solar Charged LED Utility Light
The LED array can provide enough light to illuminate a small work area or reading area at night. The red, orange, yellow and green LEDs broaden the lamp's color spectrum to produce a slighly warmer color temperature.
LED - Brooke Clarke
If the light source was another identical candle then it would be the same distance from the paper. But if a reflector was on the light source candle it could be moved further away. The light output from the T series LEDs is specified in milli candelas. A bright white LED running at 20 ma might be rated 10,000 mCd but only over a very narrow angle.
The Perfect LED Light - Garry Petrie
The perfect LED light is designed for cavers who want an efficient, uniform and constant bright light for caving. This article contains some very specific technical information and it is assumed the reader has a basic understanding of electronics. To build the light, the reader also must have some experience soldering, drilling, wiring and cutting small objects.
Pocket LED Light
This is a pocket-sized LED flashlight operating with only one AAA battery. However, the super high luminosity LEDs(blue,green or white) require at least 3.5 volts of forward voltage. This flashlight is boosting input voltage up to operating voltage of a LED with simple DC-DC converter.
Single cell LED flashlight
High efficiency white LEDs have advanced to the point where they can replace glow bulbs and other light sources not only as indicators, but also for illumination. While many of the claims made about the LEDs' efficiency, light quality, lifetime and economy are mostly exaggeration, the truth is that for very low light levels they are now competitive.
Seven Component Regulated LED Lamp
This is a minimal-parts lamp made with four white LEDs. It features regulated light output from 10V to 20V and works well as a desk lamp or flashlight. The lamp is still working perfectly 16 years after it was first built.
Bicycle Light Projects
Constructing or modifying a bicycle lighting system should be done carefully to enhance the lighting and not displace a minimum lighting that is needed for safety.In rural areas and mountain bikes more lighting may be needed.
Dynamo LED light electronics - A nice selection of electronic circuits to power LEDs from a bicycle dynamo
Battery LED light electronics - A basic step-up circuit to power an LED from a battery
High-power halogen headlight from standard parts, battery-operated
Constructing or modifying a bicycle lighting system should be done carefully to enhance the lighting and not displace a minimum lighting that is needed for safety.In rural areas and mountain bikes more lighting may be needed.
Dynamo LED light electronics - A nice selection of electronic circuits to power LEDs from a bicycle dynamo
Battery LED light electronics - A basic step-up circuit to power an LED from a battery
- Universal single-LED headlight
- Universal triple-LED headlight
- Universal LED taillight mechanical construction
High-power halogen headlight from standard parts, battery-operated
- Lots of light for your money
- All standard parts, easily completed in half a day