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  1. kellys_eye

    Making a battery to charge my laptop on the road

    I appreciate (and understand) your desire to learn - it's almost a drug to some - but in your original post you admitted to which, whilst being a noob is no bad thing, choosing to start with a project that has the potential to cause much damage and possible injury isn't the way to go...
  2. kellys_eye

    K40 Laser Cutter Upgrades

    ...ain't that always the case! I find myself making loads of test equipment more than actually using it! It's always a learning exercise - and I seem to have an insatiable desire to learn (or at least try to!)
  3. kellys_eye

    Vintage ADMIRAL 19A1 Chassis

    No problem - it's nice to hear from someone that has an interest in vintage items like your TV set. No mean task restoring them as I am well aware. FYI, I'm a member of a vintage radio web forum (includes all forms of vintage electronic equipment) at...
  4. kellys_eye

    WWV TRF Receiver For Frequency Counter Calibration

    An interesting and nicely executed project - thanks for the offering.
  5. kellys_eye

    Making a battery to charge my laptop on the road

    If low cost is your aim then you will never compete with mass produced or, specifically, Chinese delivered, items such as the ones linked to above. If you could purchase the 18650's at $1 each you're already losing money on the solution........
  6. kellys_eye

    One button to turn on esp8266 and as input.

    To make the buttons 'dual function' you have to make them operate differently. This is commonly achieved by operating the button in either a 'short' or 'long' press manner. Your IR receiver will need to measure the length of time the button is pressed and discern between the two intervals -...
  7. kellys_eye

    Yamaha rxv 465 no display and no power..

    Please post the schematic (or link to one)
  8. kellys_eye

    Vintage ADMIRAL 19A1 Chassis

    Can't find any reference to the actual frequency - perhaps you could measure the L/C values and get an approximation from that mathematically?
  9. kellys_eye

    Yamaha rxv 465 no display and no power..

    What test equipment do you possess? What are your skill levels in repairing such equipment? Have you found a service manual for it (schematic etc)? We can assist with repairs but these may be beyond your skill set unless you confirm otherwise.
  10. kellys_eye

    Making a battery to charge my laptop on the road

    Your device will only draw the current it requires, no more. The amperage of the batteries will determine how long they last (under a given load). What you're doing is creating a power pack that could be defined as 5SxP (5 in series 'x' in parallel). Such battery packs require careful...
  11. kellys_eye

    Pioneer radio wire harness questions

    Fused resistors???? AFAIAA the only protection a car radio has is the in-line fuse. There may be some added 'filtering' in the form of in-line chokes but these aren't 'protective' as such and not strictly necessary.
  12. kellys_eye

    Open collector Passive output on Oscilloscope

    The whole purpose behind an open collector output is to allow the user to connect whatever supply/load arrangement they need to suit their requirements - within the limitation of the open-collector transistor parameters of course. Your version is totally passive i.e. the output transistor has...
  13. kellys_eye

    Hep needed to ID vintage tube

    Double diode to me too - possibly and AZ1
  14. kellys_eye

    Anything you wish you knew/glad you knew at the start of your education and/or jobs?

    That weeks lottery numbers???? I also doubt that and change of mind you have now would have had any effect on you as a person back then...... try telling any 'kid' what's good for them and you'll get a cold shoulder at best, a general 'sneer' other wise.....
  15. kellys_eye

    K40 Laser Cutter Upgrades

    Would using a directed jet of blown air help the cutting process? i.e. clear the residue/smoke to allow the beam to cut more cleanly? I've seen many videos of commercial laser cutters and still wonder if they just rely on the laser 'blasting the f**k out of the material' or they actually 'blow'...
  16. kellys_eye

    Braun 6520 switch

    Post a picture of your problem. 1. we like a good laugh! (joking) 2. we can often see how things 'fit' just by looking at them
  17. kellys_eye

    Laser for welding small plastic pieces?

    Sure you want to weld? Have you tried using the appropriate solvents first? The process of welding means bringing both surfaces to the same temperature and then adding a 'filler' material to make/strengthen the joint. A laser might get the two surfaces to similar temperatures (assuming it has...
  18. kellys_eye

    Sherwood AM 7040

    Use a different signal source! The 'buzz' is some form of interference from a poorly designed power supply associated with the CD player. Is the CD player powered from an AC source? If it can be powered from batteries then the 'buzz' may well disappear. Check for good earth connections...
  19. kellys_eye

    ID 8-pin DIP

    :p yeah - I'd like to see (hear) how the store staff respond to that kind of action!!! If you can - sure!
  20. kellys_eye

    Questions about LM386 Audio Amplifier.

    As with any electronic device, getting hold of the datasheet will reveal a whole plethora of details - from the basic specification of the device to application suggestions and, in between, the technical details for why certain components are chosen to support its function. I suggest the...
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