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  1. kellys_eye

    Simpson 260 multimeter completely dead

    Good! We can 'forget' about the meter itself. Now we need to see the reverse of the circuit board where there might be some broken tracks. Using the schematic of the meter we should also be able to trace a signal path from the input connectors to the meter itself, through the relevant rotary...
  2. kellys_eye

    Simpson 260 multimeter completely dead

    The model number is shown on the scale - a 7P. The meter movement is very delicate and the case damage is indicative of it being dropped which may not be good news. The dial movement is 50uA FSD (i.e. very sensitive) so use caution when testing using a resistor/battery a 1.5V battery and a 47k...
  3. kellys_eye

    limiting a heating element in a water heater?

    Get a thermostatically controlled regulator - as per the advice above, they are cheap and readily available. You cannot just 'lower' the input power as this would only mean the water taking longer to reach boiling point - which it will always do if there is nothing to switch the power off when...
  4. kellys_eye

    Simpson 260 multimeter completely dead

    There are many different versions of the 260 - can you add more information or a picture of the front itself? The schematics are available online https://www.simpson260.com/downloads/downloads.htm and the meter is a worthwhile tool if you can get it fixed. Worst case is the meter movement is...
  5. kellys_eye

    buggy board, bad tech and strange readout... heh heh

    Cheaper and easier to use a simple test meter (multimeter).
  6. kellys_eye

    buggy board, bad tech and strange readout... heh heh

    Retake (or maybe just 'take) that class.
  7. kellys_eye

    buggy board, bad tech and strange readout... heh heh

    As with any (non-differential) signal measurement, the ground is the common ground of the power supply.
  8. kellys_eye

    buggy board, bad tech and strange readout... heh heh

    ISTR we've been over this before (sigh). The printed references relate to the pins of that port and allow a test set to be connected to examine all the onboard sensors around the fridge. You can measure them individually using a simple volt meter assuming you know what the voltage SHOULD be.
  9. kellys_eye

    Resistor value

    470k ohms
  10. kellys_eye

    Problems with Neplus NE116 audio amplifier

    Datasheet says output power at +/-30V is 40W into an 8ohm load with a 1V pk-pk input signal level. Anything outside these parameters and you won't get the performance you expect. +/-16V might see 20W. What level is your input signal?
  11. kellys_eye

    Problems with Neplus NE116 audio amplifier

    Why are you using +/-10V transformer when the circuit calls for +/-25V? You won't get maximum output unless you use the correct power supply.
  12. kellys_eye

    Problems with Neplus NE116 audio amplifier

    Show a schematic. What is the rating of your transformer i.e. what current can it supply? so the problem is........?
  13. kellys_eye

    Problems with Neplus NE116 audio amplifier

    What 'is' your power supply? Is should be capable of providing a SPLIT RAIL output i.e. +V, ground and -V (anywhere from +/-10V to +/-45V) in the configuration you've shown. It will also have to be able to deliver up to a few AMPS current (depends on the power output you're going to expect/use).
  14. kellys_eye

    Help with OnSpeed Gen 2 project

    so..... you're not actually asking us to provide you with a 'homework' answer then? Sounds very much like it to me. What's your own opinion on the board - so far?
  15. kellys_eye

    Ultra fast shutter for parabolic concentrator

    Nano seconds???? Not a chance! At least not at any price you could possibly afford! You will probably have to go 'digital' and potentially use LCD materials to stop the light but that, in and of itself, will introduce a medium (the LCD carrier liquid) that will affect the light itself anyway...
  16. kellys_eye

    Identify these

    Yes (sort of!) The one on the right is 10k ohms (10,000 ohms), the one on the left is an 'unusual' one in that it is ZERO ohms - in other words a shorting link and likely put there as 'fuse'. Both are (at least look like) 0.125W (1/8th watt) versions, 5% tolerance (not the zero ohms one though!)
  17. kellys_eye

    Is This Inverter circuit working with 9-0-9 transformer and 15v battery

    Change all your lights to 12V (LED) and use a battery charger when power is available. All you're doing by using an inverter is 'wasting power' as the design is very inefficient.
  18. kellys_eye

    Motorcycle on sensor

    No 'accessory' socket anywhere? If not then your only choice is to 'tamper with wiring' else there's no hope of connecting it any other way.
  19. kellys_eye

    Motorcycle on sensor

    A simple relay? ISTR that motor cyclists ride around with their headlights permanently on - connect your hand warmers to the headlight circuit.
  20. kellys_eye

    Marcraft SE-1016 datasheet or manual needed

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