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  1. kellys_eye

    Parts for a Realistic STA-90 Receiver

    ...and are quality suppliers. I've never resorted to 'audio grade' components on the basis that they're inevitably audiophoolery con tricks although there is some actual truth to 'some' of the claims. If you get the right voltage and at the right value (or, if you have to go 'nearest' value...
  2. kellys_eye

    Output Transitor Circuit Inconsistencies

    Your methodology is weird..... 'no-one' does that to establish whether a circuit is ok or not...... however, the measurement points you indicate are basically two resistors in series; the 10Ω and the 0.22Ω resistors. The readings you get will be 'ok' if you accept 10% tolerances although the...
  3. kellys_eye

    Understanding N channel and P Channel FETs

    As ever, I always refer such queries to the Horowitz and Hill book "The Art of Electronics". There are, no doubt, many other books on the subject (and websites) but for sheer completeness you really should invest in a copy of that book. It will help you in all areas of electronic knowledge...
  4. kellys_eye

    Output Transitor Circuit Inconsistencies

    That's not the way it's done.... with the transistors out of circuit you can do a static test on them to determine if they are dud on any junction (you can do this in-circuit on most occasions). The other method is to measure the voltages at the base, emitter, collector and determine the...
  5. kellys_eye

    DIY conventions?

    Trying not to be pedantic...... have you even Googled 'Maker Convention' or any other variation on the word(s)? If you are genuinely 'keen' you'd have exploited every possible method to source such convention details before asking here. Google - as 'evil' as it is - is still the go-to solution...
  6. kellys_eye

    Good, economic epoxy mixer?

    Measuring cups? Two identical cups, each 'full' will always equal a 1:1 ratio. Syringe (for smaller amounts). Bigger cups (for larger amounts) ANY two cups that are half the capacity of the total mix you need would do it.
  7. kellys_eye

    Power Google Home Mini

    Why not use a 5V power bank (rechargeable) at the local end? 5V at 500mA is only 2.5W and a 5000mAhr battery bank would power it for 10 hours - probably longer if it is idling for any length of time.
  8. kellys_eye

    SC8108 Troubleshooting

    Well, is it working or isn't it? If the display unit is working then it 'must' be powering up.
  9. kellys_eye

    Fixing a 1993 Sharp VCR.

    There are far too many interlocking switches, detectors, movements etc to offer an answer without some context (pictures, schematic etc). As you can appreciate, if just one of those devices fails or seizes then the system 'stops' - they are quite 'delicate' in that respect. It can take ages to...
  10. kellys_eye

    Anyone know what this is?

    I concur with @(*steve*) - a cheap and nasty fuse solution in its present form and better off replaced with something 'standard'. That said, a blown fuse is indicative of a fault..... and simply replacing the fuse may just cause it to blow again. Resist the temptation to fit a larger fuse...
  11. kellys_eye

    HP CM1312nfi MFP Printer network port dead

    Yup, that's a network port with the built-in isolation transformers - the actual network controller will be the tiny multi-pin chip to the left of it. https://www.sparkfun.com/products/8534 If the transformers have blown (that's what they're there for - to protect the lines) then this may be...
  12. kellys_eye

    HP CM1312nfi MFP Printer network port dead

    Is the network port socket on the MFP an 'active' port (i.e. does it have the electronics built into the port itself or is it on the board?) There is relatively high incidence of this type of (active) port going dud - maybe it doesn't have decent surge protection in it? Either way, with decent...
  13. kellys_eye

    Land telephone sometimes fails

    Is this a line (i.e. phone line) powered device? How long is the extension? Is it a 'ready-made-up' cable or something else? The POTS (plain old telephone system) uses DC and AC for operation.
  14. kellys_eye

    Anyone know what this is?

    Might be - it's a new one on me. How about a wider view of the whole unit? Some form of 'context' might help here.
  15. kellys_eye

    HP CM1312nfi MFP Printer network port dead

    Is the device on the other end of the network cable working ok? If it is a multi-port device (network switch for example) have you tried using a different port?
  16. kellys_eye

    Fixing a 1993 Sharp VCR.

    If it is a mechanical fault then opening the unit and watching how the mechanism works and 'helping it on its way' can often reveal where the mechanism sticks and repairs can be made.
  17. kellys_eye

    HP CM1312nfi MFP Printer network port dead

    Does the printer otherwise work? Are all the other ports working? Tried a new network cable?
  18. kellys_eye

    Comedy Thread

    You've got politicians haven't you?
  19. kellys_eye

    D25XB60 bridge rectifier connections.

    Based on your description the 0V line will be the common ground to the two DC rails that the bridge produces (a positive and a negative). Note - I can't be bothered to edit the 6V to say 24V!!
  20. kellys_eye

    Why are there not millions of usable frequencies?

    If you imagine the eye trying to discern a particular colour (frequency) you can see that it's not very good...... this is because the human eye has a very wide 'bandwidth' and the filter (the brain) isn't very efficient in this respect. Technologically we can design filters with very narrow...
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