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  1. kellys_eye

    Car horn as speaker for musical keyboard

    I believe they've even fitted 'speakers' to the F1 cars as the new hybrids aren't anywhere near as loud as the original normally-aspirated versions! The spectators were getting disappointed at the lack of 'noise' so the F1 authorities made the car manufacturers fit some sort of noise...
  2. kellys_eye

    Homemade Multi-Drill

    Well, depending on how determined you are (or how essential the system you want to build actually is) you could purchase NEW drill mechanisms.... our local Lidl/Aldi store often has battery drills for low, low prices - they come with NO BATTERY, the idea being you purchase one or as many...
  3. kellys_eye

    Homemade Multi-Drill

    Probably because they are constructed using below-spec parts and have outputs that barely (or safely) reach the stated maximum. The old adage 'you only get what you pay for' stands true everywhere. Whilst I don't doubt the Chinese suppliers can't deliver these items cheaply (mass production...
  4. kellys_eye

    Bc 547 vs 2n2222

    Bend the leads to fit the correct connection - that's what everyone else has to do.....
  5. kellys_eye

    Homemade Multi-Drill

    There is no really reason to use multiple motors - a single motor driving a load of shafts/collets would be easier to implement but you'd be 'stuck' with the shaft separation (distance) you design it for i.e. you won't be able to alter the distance between holes. Drill chucks are easy enough to...
  6. kellys_eye

    Optima 2 plus

    Sure it's an 'A' and not an '8' (with the lower LED 'bar' missing)? Can you get the display to show any other numbers to confirm the bottom segment of the display works? These would be 2, 3, 5, 8, 9 and 0.
  7. kellys_eye

    Capacitor or Diode?

    For future reference you don't have to 'fully' remove the damaged part - indeed, cropping the leads either side of the blown component would have left you some 'easier' leads to solder a replacement part to.
  8. kellys_eye

    Capacitor for 240v 1/4 hp vintage lathe.

    Yes, this is going to be key to fixing the issue. Starting another thread is pointless - we NEED the information before we can offer assistance. If you can't make a wiring diagram then spread the wires out so we can see where they all go - the current set of pictures are a 'jumble' of...
  9. kellys_eye

    Homemade Multi-Drill

    You would - literally - need battery-powered drills (as per the stuff DIYers use) to drill holes at 10mm diameter! Using motors as small as the ones you show (which seem to be ex-battery drill motors imho but without the gearboxes) you WILL need a gearbox reduction to attain a 10mm capacity...
  10. kellys_eye

    Making a Bench Top Power Supply From a 24 Volt 5 Amp Battery Charger

    Better off starting with an old laptop or printer PSU. I have a few 36V 3A (might be 2A) power packs from old printers - laptop PSUs with around 20V output are very common.
  11. kellys_eye

    Car horn as speaker for musical keyboard

    I once had an idea to record different vehicle sounds and replay then via a horn speaker secreted under the car somewhere. The system would have used throttle load to vary the tone/pitch of the sound. You would have been able to select 'steam train' for example and 'chuff, chuff' away at...
  12. kellys_eye

    Homemade Multi-Drill

    What's wrong with battery portable drills? That's what they're made for!
  13. kellys_eye

    An amateur requests help with motors

    Start by drafting a 'sequence list' - a column of motors and switches and rows with each 'step' of the movement process. You may not need any controller as such - each switch could direct power to the next part of the movement as the sequence progresses but you MUST have a known sequence to...
  14. kellys_eye

    P. A. sounds system with generator

    You can only use it on 120V if the amplifier has the ability to change the input voltage to match. This is commonly by a slide switch marked 240/120 and by changing the fuse accordingly. If the device was 'auto-ranging' for supply input it would specify the full input range i.e. 90-240V. If...
  15. kellys_eye

    Help on identifying this resistor or inductor

    Could be part of a buck or boost circuit and such inductors may burn out because the switching device has gone short - they rarely 'go' on their own. Worth checking the adjacent circuit(ry).
  16. kellys_eye

    5v Bluetooth Audio Receiver Overheat Issues

    The device has a micro USB for power...... since when did this port use anything other than 5V? Where were you applying the power if not through the micro USB port? Even the bottom of the board shows 0V/+5V..... not 7.4V or anything else. The Great Scott video: shows him using 3.4V from an...
  17. kellys_eye

    P. A. sounds system with generator

    consumes or outputs?
  18. kellys_eye

    Fence flasher

    Show a diagram of your wiring.
  19. kellys_eye

    5v Bluetooth Audio Receiver Overheat Issues

    So you weren't running the board at 5V to start with? No wonder it blew up!
  20. kellys_eye

    Repairing a burned-out Flash Unit (screenprinting)

    This is the key specification. It's always wise to over-rate any switching device to provide a safety margin and 50% is a good place to start which means you need an SSR that can cope with 25A MINIMUM. As mentioned, although 'marked' as 40A SSR's, many of the Cheap Chinese knock-offs are...
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