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  1. kellys_eye

    Circular?

    Do you still have the files that I could use to practise with?
  2. kellys_eye

    Please Help!!! Need circuit board that can independently fire 22 leds.

    Look at any 4-16 line decoder (74LS154 etc) which will 'drive' any one of 16 outputs based on a 4-bit input. With 5-bits you can use two of them for 32 potential outputs.
  3. kellys_eye

    2N4917 equivalent

    Got a schematic? The transistor is a plain old PNP silicon and any low power device will suffice i.e. BC557, 2N3906, BC327 etc. I doubt the diode requirement will be more than what a 1N4148 can deal with either - a schematic would confirm.
  4. kellys_eye

    Technics SA-CH550 panel very dim, is it fatal

    Get them to fix the display whilst they're in there.......
  5. kellys_eye

    Sony CDP-CX355 table error belts already changed help please

    Upload a video to Youtube and post a link.
  6. kellys_eye

    You know you're a valued customer when...

    It would occupy one drawer in my component storage system and there's usually space for 100 or so in each and I have a few spare drawers! I suspect @(*steve*) has a similar system????? An empty drawer is seen as an excuse to purchase more bits!
  7. kellys_eye

    Replacing thermostat in a fog machine

    Could be 220C by the markings on it.
  8. kellys_eye

    For Sale: SignalHound BB60C Spectrum Analyzer

    with a warranty.....
  9. kellys_eye

    Sony CDP-CX355 table error belts already changed help please

    Pics of the loading mechanism, both sides, internally.
  10. kellys_eye

    Reverse engineering of temperature sensor

    What I was getting at was how the signal is subsequently processed. You might have found (for example) that the processing circuitry delivered an RS232 (somewhere) as part of its function - many digital measuring gauges have such, as the hacking fraternity will attest to - which would be easier...
  11. kellys_eye

    You know you're a valued customer when...

    Get 25. Then we'll all know where to come when WE need 'one'.......:D
  12. kellys_eye

    Arduino reading double-din radio volume rotary dial knob

    Quite right. I was thinking of a different type of encoder :oops: I can't quite see the marking on the control but the tracks look to have the centre pin grounded and the A/B pulses on the two outer pins (pulled high by resistors).
  13. kellys_eye

    Technics SA-CH550 panel very dim, is it fatal

    Typical VFD (vacuum fluorescent display) degradation. Some people talk about over-driving the filament to burn off any contaminates and improve display performance but that's a pretty hit'n'miss solution with the chance of simply blowing the element completely. Other than a display replacement...
  14. kellys_eye

    Reverse engineering of temperature sensor

    What does the signal feed? Is it analogue or digital? How does it display the data normally?
  15. kellys_eye

    Arduino reading double-din radio volume rotary dial knob

    There are three connections on one side of the control, two on the other. The 'two' will be the push-to-make contacts of the rotary 'push' function. One side may be grounded and the other floating at +5V (grounded when the button is pushed). The 'three' connections will be +5V, 0V and the...
  16. kellys_eye

    Using smd solder paste on pc board that no smd on pc board

    1. yes 2. yes - but why? Normal rosin-cored solder and a soldering iron is the usual method. But whatever floats your boat!
  17. kellys_eye

    74166 8 bit shift registers

    Your symbol just uses different pin designations - compare the pin numbers to those of the datasheet and you'll see how they 'match'. The 'General Description' on page 1 of the data sheet explains how the device works and how signals propagate. Suggest you mark up the data sheet pins to match...
  18. kellys_eye

    Circuit not working

    Your logic inputs (switches) should not 'float' - use a resistor (10k will do) between each input and ground to set a logic 0 level. Same for the /MR pin on the SR. You can't tie the two OR gate inputs together without setting a logic level either...... You will also need another diode at the...
  19. kellys_eye

    Sony CDP-CX355 table error belts already changed help please

    There will be some form of 'tray detect' switch that indicates when the tray is at the 'in' position - possibly a simple two-contact lever switch - that may require contact cleaning. Some pics of the internals would go a long way for us to assist.
  20. kellys_eye

    Philco Radio Parts Identification

    Best method would be to source the schematic - which is very likely easily available (as below) - and essential for anyone doing restoration work. The 'wax covered thing' looks to be an inductor - the schematic doesn't give a value but does show it to have a DC resistance of 9.5Ω. You'll have...
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