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  1. kellys_eye

    Bose Amplus 100

    Does it have one? Seems to me like the muting is done at the source equipment, not the amplifier.
  2. kellys_eye

    Leaked Battery Motherboard Repair

    Simply removing parts from a multi-layered board doesn't necessarily mean its death knell! It's quite possible to remove parts without causing damage but once damage HAS occurred it's nearly impossible to fix. You can tell if you've caused damage as the thru-hole plating tends to remain on the...
  3. kellys_eye

    Power-One power supply mod

    Given that you can purchase a PSU in kit form for the measly sum of $6 - delivered - (lacking only the transformer which.... ta dah.... you might have a suitable candidate :D) then trying to modify the one you have would be beyond reasonable...
  4. kellys_eye

    Advice before buying an Inverter

    Most inverters have a regulated output that shouldn't change much over a range of input voltages. The motor may also be 'frequency dependent' i.e. tied to the 50Hz AC signal. But the inverter, like a lot of cheap ones, probably has a 'stepped' output (called a 'modified sine wave') rather than...
  5. kellys_eye

    What is this device

    There's no pick up coil for the input - no place for 'any' input as far as I can tell - so I doubt it's for automotive timing purposes. Still a strobe though :p
  6. kellys_eye

    VCLFO debugging

    You built the LFVCO - the wall wart isn't any more complicated, go for it. There is no shock risk from the 12V AC power pack. Providing you put the parts in the 'right way around' then it will work.
  7. kellys_eye

    Yamaha psr e403 low sound output from speakers

    Is the volume control mounted on the circuit board? If so, resolder the pins on it. Sounds like you might have one side of it open-circuit.
  8. kellys_eye

    What is this device

    Looks like the inside of a 'beacon flasher' to me. What 'electricity' did you connect it too? Those things operate anywhere from 6V to 24V DC (batteries usually). Anything else will have broken it. It may already be broken before you started!
  9. kellys_eye

    Freeview in car tv

    Freeview is terrestrial digital TV. Older TV receivers (as may be found in old campervans) possibly work on the old analogue TV system which, in the UK, has been closed down in favour of the new digital service. If the screen scans in 'MHz' as opposed to 'channel numbers' then your TV is...
  10. kellys_eye

    Please Help Identifing Diodes In Old Boat Motor Rectifier

    If you're not too concerned over originality then you could replace the unit with a modern bridge rectifier such as this: They can be found in many voltage and current ratings up to 100's of amps, bolt straight to a piece of metal (for heatsinking) and use standard spade (crimp) connectors...
  11. kellys_eye

    Leaked Battery Motherboard Repair

    Ideally you would use a continuity meter and trace the path of the copper track to points at either end where the corrosion is not apparent and then check that the path between those two points is continuous. On your picture I see that pin 2 of the DIN socket has a track that goes via L3 then...
  12. kellys_eye

    Sencore LC53 leakage test acting up?

    The 'orange' capacitor in your earlier post (the one marked 25 25 DC) is an electrolytic, not film. These are particularly noted to dry out over time and replacement is usually standard practise for ALL such types in any equipment that you want to have longevity in. In older equipment they are...
  13. kellys_eye

    How to minimize acoustic mike<loudspeaker feedback?

    Which is why they use earpieces! Well the pro's do..... or you see them standing with a finger poked in one ear!
  14. kellys_eye

    Multi Video game connection

    Switching between composite signals is easy - you can even use a multi-pole rotary (or push-button) switch to do this. you could also purchase a composite switcher: http://www.hdtvsupply.com/cosw1.html If you also purchase a Composite Video-to-HDMI converter like one of these...
  15. kellys_eye

    Question about radio waves and signal propagation

    Signal propagation (power degradation) follows an inverse square law (in free space) over distance. For every doubling of distance you receive only 1/4 of the signal power at the receiver. This is just the 'basic' of power loss in free space and is additionally altered by the medium (air...
  16. kellys_eye

    High Voltage Probe and DMM internal impedence question

    The input impedance will depend on the range in use and be a minimum of 10MΩ on the 'basic range' (usually the 0-2V range on a 1.999 count meter). On the 20V range it will be 20MΩ or thereabouts. So for the probe you're using the instructions will be to use it on a particular 'range' of your...
  17. kellys_eye

    Strain gauge purchase

    The OP is aware of such but lacks the data sheet information - a common problem with cheap'n'cheerful purchases from China.
  18. kellys_eye

    Multi Video game connection

    The Red, Yellow and White plugs are composite video (with audio) and a totally different signal than that created over HDMI. Unless you have a monitor that can accept a multitude of different signal types (some modern TV sets actually do) then you'll have to convert the signals to a single...
  19. kellys_eye

    Half-bridge driver for induction heating problem

    Yeah -that circuit relies on critical tuning of the two LC circuits which is probably why your layout doesn't work. The 'new' arrangement will work and come to resonance as you 'tune' the basic switching frequency through the required point but with no special effort at coupling.
  20. kellys_eye

    Ignition coil driver.

    Your image shows the flyback core with 5+5 turns on the primary and 'lots of turns' on the secondary. That's a flyback transformer. That arrangement in itself is capable of potentially fatal voltages and you're applying it to yet another coil with even more turns-ratio..... You have no means...
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