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Thread: Renard to H-Bridge Projector Dowser

  1. #1
    Junior Elf member chiefwarrant's Avatar
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    Renard to H-Bridge Projector Dowser

    I originally posted this on the "Red" forum, but got no feedback.

    I am adding a projector this year and I am building a projector dowser to black it out completely. I have read the post from Ricky (JRD) here (http://doityourselfchristmas.com/for...ghlight=dowser), however, I am running into a problem finding a 100% functional CD ROM drive in my price range (free-to-very cheap).

    I was able to find one, but someone let the magic smoke out of it. However, the 5VDC tray motor was still functional! That got me to thinking about a simple H-Bridge using NPN/PNP transistors, which would operate directly off a Ren64 (or similar) port.

    It has been years (30+) since I have worked on transistor based circuit design and would like someone to look at what I have so far (see attached image).

    Although I could not find the actual voltage, I am assuming the output voltage from the PIC (RA/RC) is less than 6VDC.

    The NPN would be a Mouser 583-2N5551-T or similar, with a VEBO of 6V. If I am reading the datasheet right, this would eliminate the need for a base resistor. The PNP would be Mouser 833-PN2907A-AP or similar, also without the need for a base resistor.

    Thank you for your help.

    Tony
    Attached Thumbnails Attached Thumbnails Renard to H-Bridge.jpg  
    Tony
    Live since 2007
    Putting the Yule back into Yuletide.

  2. #2
    Santa member dirknerkle's Avatar
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    I made a similar gizmo to block my virtual Santa display, using a 12v automobile doorlock solenoid, powered at 5vdc for a less violent action. Triggered from single channel of an AC SSR that was powering a 5vdc wall wart, which then powered the shutter. I let gravity drop the shutter so activation was easy: turn on the channel and it opened, turn off the channel and it closed. I considered converting an old DVD drive, but that would take two channels to operate the H-Bridge, and I was concerned about how well the lubricants might work in our super-cold temperatures... Turns out, this puppy worked flawlessly.

    BTW, I've got some extra DVD/CD rom drives I don't need/want... Price is free but you pay shipping from 55446. I've got H-Bridges too if you're thinking of making one using an old drive.

    Last edited by dirknerkle; 02-16-2019 at 09:17 PM.
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  3. #3
    Junior Elf member chiefwarrant's Avatar
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    Dave,

    I am assuming the shipping is $10.35 for medium flat rate box (FRB2 13-5/8 x 11-7/8 x 3-3/8) which should hold two. PM me if it is and I will PayPal the funds for shipping of two CDROM drives.

    Thank you for the offer on the H-Bridge, I still may take you up on it. Kind of on a little bit of a learning journey right now.

    Reviewing the schematic, I noticed the DC Motor was not connected to the right Net. It is corrected below.
    Attached Thumbnails Attached Thumbnails Renard to H-Bridge.jpg  
    Tony
    Live since 2007
    Putting the Yule back into Yuletide.

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