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  • RGB LED Strip With Dimmers on RGB Lines and Colour Organ

    Cool project. Kudos!I noticed that the schematic in the attached ZIP file is different from the one you have included in this instructable. (The one included in this instructable simply wont work).The one in the ZIP file will work sort of.1. There is an erroneous connection connecting C7, R9, R10 & D12. This has the effect of shorting R10 and passing the audio signal to ground via D12.2. D10 & D11 serve no purpose. Just wire LED1R, LED1G & LED1B anodes to +12V.3. Transistors are current devices. The base on the NPN draws current and should be limited by a resistor. D14, D13 & D2 should be replaced with a resistor to limit the base.4. MOSFETs are voltage devices so theoretically the gate shouldn't draw or sink current. However MOSFETs aren't perfect. A 10K resistor in se...

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    Cool project. Kudos!I noticed that the schematic in the attached ZIP file is different from the one you have included in this instructable. (The one included in this instructable simply wont work).The one in the ZIP file will work sort of.1. There is an erroneous connection connecting C7, R9, R10 & D12. This has the effect of shorting R10 and passing the audio signal to ground via D12.2. D10 & D11 serve no purpose. Just wire LED1R, LED1G & LED1B anodes to +12V.3. Transistors are current devices. The base on the NPN draws current and should be limited by a resistor. D14, D13 & D2 should be replaced with a resistor to limit the base.4. MOSFETs are voltage devices so theoretically the gate shouldn't draw or sink current. However MOSFETs aren't perfect. A 10K resistor in series with the gate wouldn't hurt.Keep up the good work :-)

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  • kiwigrinder commented on jbumstead's instructable "Fiber Optic" LED Matrix4 months ago
    "Fiber Optic" LED Matrix

    The round hole for the glue stick stops just above the square hole for the WS2812B. So it sits very close but doesn't touch it. It also stops the glue stick from going right though. It makes it a bit hard to put all the glue sticks in place when joining the top and bottom sections, but because they are flexible, you can do it with a bit of patience.

    Fantastic design. Since I don;t have access to a laser cutter, my variant of your make is 3D printed. It uses WS2812B LED strips and 7mm x 100mm glue sticks to keep the cost down. (https://www.thingiverse.com/thing:3403301).

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  • kiwigrinder made the instructable "Fiber Optic" LED Matrix4 months ago
    "Fiber Optic" LED Matrix

    The goal was to replace the 12mm Diffused Digital RGB LEDs with cheap WS2812B RGB strips and to make the container for the LED's and electronics as thin as possible allowing cheaper 7mm Glue Sticks to be used. Cabinet is 3D printed and a PCB make using the toner method holds the electronics. STL, Eagle files and Arduino sketch is available at https://www.thingiverse.com/thing:3403301

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  • Google Assistant Controlled LED Matrix !

    The datasheet for the MAX7219 shows that the minimum voltage is 4V. Running it from a 3.3V supply is not recommended.

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  • kiwigrinder commented on mimikamp's instructable LM3916 LED Chip Alternative7 months ago
    LM3916 LED Chip Alternative

    Your circuit emulates a LM3914 chip which uses a linear resistor ladder where all resistor values are 1K ohms .The LM3915 chip uses a logarithmic resistor ladder where the values are 1K, 0.41K, 0.59K, 0.83K, 1.17K, 1.66K, 2.34K, 3.31K, 4.69K, 6.63K ohms. The LM3916 chip uses a VU scale and the resistor ladder values are 708, 1531, 923, 819, 1031, 1298, 769, 864, 970 and 1087 ohms.

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  • kiwigrinder commented on funelab's instructable Arduino Air Bonsai Levitation1 year ago
    Arduino Air Bonsai Levitation

    Nice work. Do you have a template for the acrylic sheet?

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  • PIC16F1847 and AR1010 Based FM Radio Music Box

    Can you please provide the eagle files and the max7219 library that you used. Thankyou

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  • Electronic Projects for Beginners

    The Electronic LED Hourglass uses STC15W201S microcontroller. This is basically an enhanced 8051 microcontroller which is a INTEL based design. PIC processors are from Microchip and use a completely different instruction set and architecture

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  • PCB Etching Using Laser Printer (Toner Transfer Method)

    I always drill my boards directly after the etch while the toner is still on. It is a lot easier to see the holes.Also once you clean off the toner, spray the copper side with PCB Lacquer otherwise overtime the copper will oxide and turn green.

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  • kiwigrinder commented on AlanH87's instructable Light Painting Robot1 year ago
    Light Painting Robot

    Great looking animations. Pity you can't see them in real-time.Is there a reason to use the 4 neopixels?A single RGB LED should be able to the same job (you would need to paint the animation more times, but it should still look the same on time lapse camera). A single LED should be lighter and less taxing on the stepper motor that controls the arm.

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  • kiwigrinder commented on enzosaudi's instructable RoboBin || Garbage Catching Bin1 year ago
    RoboBin || Garbage Catching Bin

    Where is the fun in that? :-)

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