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The electronic color code is used to indicate the values or ratings of electronic components, very common in resistors. Color bands were commonly used (especially on resistors) because they were easily printed on tiny components, decreasing construction costs. To distinguish left from right there is a gap between the C and D bands. band A is first significant figure of component value (left side) band B is the second significant figure (Some precision resistors have a third significant figure, and thus five bands.) band C is the decimal multiplier band D if present, indicates tolerance of value in percent (no band means 20%) Color Significant figures Multiplier Tolerance Temp. Coefficient (ppm/K) Black 0 ×10 0 – 250 U Brown 1 ×10 1 ±1% F 100 S Red 2 ×10 2 ±2% G 50 R Orange 3 ×10 3 – 15 P Yellow 4 ×10 4 (±5%) – 25 Q Green 5 ×10 5 ±0.5% D 20 Z Blue 6 ×10 6 ±0.25% C 10 Z Violet 7 ×10 7 ±0.1% B 5 M Gray 8 ×10 8 ±0.05% (±10%) A 1 K White 9 ×10 9 – – Gold – ×10 -1 ±5% J – Silver – ×10 ...

Colour Sensor Circuit diagram is an interesting project for hobbyists. The circuit can sense eight colours, i.e. blue,green and red (primary colours); magenta, yellow and cyan (secondary colours); and black and white. The circuit is based on the fundamentals of optics and digital electronics. Colour Sensor Circuit diagram : Colour Sensor  Circuit Diagram The object whose colour is required to be detected should be placed in front of the system. The light rays reflected from the object will fall on the three convex lenses which are fixed in front of the three LDRs. The convex lenses are used to converge light rays. This helps to increase the sensitivity of LDRs. Blue, green and red glass plates (filters) are fixed in front of LDR1, LDR2 and LDR3 respectively. When reflected light rays from the object fall on the gadget, the coloured filter glass plates determine which of the LDRs would get triggered. The circuit makes use of only ‘AND’ gates and ‘NOT’ gates. When a primary coloure...

This project is a remake of an old discolights pod. Original 24V 5W bulbs are changed to 230V 40W with E14 thread. Original driver board has non-typical signal input. This driver is based on the FT245RL chip, a USB-LPT converter – so you can use it with PC applications such as discolitez. Low voltage part is supplied directly from the USB so there is no need to to use any transformer… Device uses a MOC3041 optotriac and a BT136 triac in a standard application to drive bulbs. Note if you want to use stronger bulbs, like 100W or more, you need to use some little radiators to cool down the triacs. There are 4 channels, 3 are used for bulbs and 4th is used as an extra 230V output – in this case for a mini strobe. You can find 4 goldpins on board, these are a 4 extra output channels – so you can expand device to another optotriacs and triacs to use 4 more 230V devices. To your own safety, use a proper fuse, and remember that device works on a 230V potential. You can use it with 110V devices...