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  1. kellys_eye

    Using an Arduino to read Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor

    Have you tried using another sensor to eliminate it as a potentially faulty device?
  2. kellys_eye

    One for the New Year

    I enjoy watching Youtube videos by The Tech Guy (he repairs hi-end test equipment) and have always admired his variable AC power supply that he often uses to power up equipment that have PSU problems. He did a video showing the innards of this variable AC power supply and despite its relative...
  3. kellys_eye

    LED for electric heater (UK)

    Wire a neon across the thermostat. It will be out when the heater is on -shorted by the thermostat contacts (but the rocker switch neon will be on then anyway) and 'lit' when the thermostat is open circuit.
  4. kellys_eye

    Programming micro controller of massage chair

    You tell us! What have you currently got? What do you want it to do?
  5. kellys_eye

    LED for electric heater (UK)

    Back to the original post........ Is the heater on a standard flex and 13A plug? Is it 'portable' or fixed? A fixed heater should be wired to a fused, switched connection, ostensibly one fitted with a neon power indicator anyway. A portable heater will simply plug into any wall socket and...
  6. kellys_eye

    Why does a dc motor "stutter"

    How many wires come from the motor? If it's more than 2 then it's as @Minder suggests, a stepper motor. If there are only two - and some printers use normal motors mounted with slotted opto-couplers - then the motor could just be stalling under load and may require reduction gearing to...
  7. kellys_eye

    LED for electric heater (UK)

    You also need a reverse-biasing diode wired across the LED.
  8. kellys_eye

    5v Voltage Regulator Help

    Note that the greater the load the more the regulator will dissipate and a heatsink will be required in most circumstances.
  9. kellys_eye

    5v Voltage Regulator Help

    ...it won't do this all the time though. The charging current will vary over the charge cycle. If you want to test your PSU then deliberately load the output using a known value load - a 5Ω resistor will cause 1A to be drawn. The resistor will need to be suitably rated though (5W minimum).
  10. kellys_eye

    5v Voltage Regulator Help

    You can't 'push' current into a load - it will 'draw' only what it needs and no more. You can fit an additional resistor across the output to deliberately increase the draw but.....why?
  11. kellys_eye

    Project idea

    High/low temperature alarm, high/low voltage alarm? In fact any 'alarm' where a difference can be measured - using the op-amp as a comparator.
  12. kellys_eye

    LED for electric heater (UK)

    I'd be interested to see the actual wiring in the OP's heater..... pics please!
  13. kellys_eye

    LED for electric heater (UK)

    Sounds like the switch is wired AFTER the thermostat to me - the switch being a simple neon-lit on/off rocker. In which case what you plan won't work.
  14. kellys_eye

    Accurate temperature control for water heater.

    Modulating the heater shouldn't be necessary given the latency of the liquid you're heating but consider having a circulation system to thoroughly 'mix' the liquid being heated. Either way there are numerous thermostats (electronic) that can manage the control process - they usually (but not...
  15. kellys_eye

    Modular Controller build with Arduino (Teensy 3.5)

    I2C is a protocol enabled in software and/or hardware and as such available as a 'sketch' for the Arduino range of processors - the Arduino range having the hardware built-in. The ATtiny20 is the smallest (I think) with I2C built-in...
  16. kellys_eye

    Modular Controller build with Arduino (Teensy 3.5)

    The 'proper' way to do this would be to use a proprietary communications bus - like I2C or RS485 or even NMEA!! - and develop individual controllers (gamepads etc) that output to that bus. With simple I2C comms protocols being possible in some of the smallest PIC-type microcontrollers there's...
  17. kellys_eye

    Hartung amplifier project

    Not quite 100 years but I get your drift! There is still a very active 'tube' amplifier community - those that like the 'warm' sound that tubes (valves) are purported to deliver...
  18. kellys_eye

    usb charge cable

    Does your TV have a USB socket? Many do and the antenna you bought seems to be designed for such. The alternative is to purchase any old USB charger power pack and use that.
  19. kellys_eye

    30pin samsung tab2 7 inch p3100 charging port problem

    We really need to see a picture to establish the problem. It could be that the tracks have actually come away from the board (still stuck to the pins) - a common problem if the plug and/or socket doesn't have decent physical/mechanical connection to the circuit board.
  20. kellys_eye

    ac/dc adapter 5v 100ma

    Check the voltage polarity on the plug (it should be ok) and that it fits the socket - otherwise yes, it will work.
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