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  1. K

    Measuring Liquid conductivity

    Yes...yes...yes. Looked at the circuit again. I concede. ;) Ken
  2. K

    Measuring Liquid conductivity

    No! 0v to +5v to 0v to +5v, regardless of duty cycle, is pulsating DC. The current is always going in the same direction, it does not "alternate" directions. However, if you pass it through a capacitor, the DC component will be removed, and then it will be AC. ;) And, the duty cycle in the...
  3. K

    Measuring Liquid conductivity

    That circuit won't reduce corrosion. Well,maybe by half. It's pulsating DC, not AC. Ken
  4. K

    project topics for B.E level

    Is this a final year project, or just a course project? What areas of electronics do you find the most interesting...things you would like to do, even if it weren't an assignment? Ken
  5. K

    project topics for B.E level

    Yeah, I assumed that. But in what area? Electrical, Industrial, Civil, Chemical, Biomedical, Mechanical....? Project suggestions probably should relate to their area of expertise. Ken
  6. K

    project topics for B.E level

    B.E level...? Ken
  7. K

    Repairing Keithley 480 picoammeter motherboard

    bob I have a manual for the 480 with block diagrams, schematic, board layout, and parts list. Send PM to me. Ken
  8. K

    Motor or solenoid

    Actually, I don't know if you would need a flow sensor at all. Again, an assumption: a person walks up to the kitchen sink, selects (???) the water temperature they want, then opens/adjusts a single flow control valve by turning a knob or moving a lever. The total flow is set by this valve. The...
  9. K

    Motor or solenoid

    Is this a design for commercial use, or a class or personal project? I think "dosing" may be the wrong approach. Dosing would imply a fixed amount of water from each water supply to achieve a final water temperature. But, it sounds like you are trying to maintain a constant water temperature...
  10. K

    Motor or solenoid

    What volume are the doses? How accurate must the dose be. How frequently does the dose occur? Is the dose fed against a back pressure at the outlet, or to atmosphere? Is the only measure of dose, volume through drop in pressure over a time period? What size piping are you using? ????? It...
  11. K

    Reading Circuit

    Yes the junction of C3 and C4 go to pin 16 on the IC. There are also two connections to pin 14 from R13 and from C5 Ken
  12. K

    Reading Circuit

    The numbers refer to the counter bits of the 4017... the numbers in red inside the IC symbol. "0" (pin 3) connects to R1, D1, and D5. "1" (pin 2) connects to R2, D2, and D6. And so on...! It's like a parallel 4 wire buss. I think it was just to make the schematic simple to draw. Ken
  13. K

    Circuit board from E-11 Hasbro toy blaster.

    What happens if you disconnect the battery, hold the trigger in, and reconnect the battery? Ken
  14. K

    Modifying Electronic Timer Switch

    sbglobal2010, Was there supposed to be a link? Ryan was looking for a push-on/timed-off timer function. I don't see any Aube timers with that option. Ken
  15. K

    Circuit board from E-11 Hasbro toy blaster.

    Simple, it's not. The black blob on the foil side of the board hides a microcontroller that senses the button pushes, generates the different sounds and drives the transistor that drives the speaker. Is the rubber assembly on the foil side the trigger switch? Is there more than two positions...
  16. K

    Modifying Electronic Timer Switch

    Here's the installation manual:http://www.horstmann.co.uk/downloads/ElectronicDocuments/Electric-Water-Heating/Electrisaver-UserandInstallationGuide.pdf It's probably using a pre-programmed microcontroller. I seriously doubt that there is any way to change the time. Ken
  17. K

    Components Substitutes Help

    Steve, Did you mean 1/4W resistors...or 1.4W resistors? :) Ken
  18. K

    Miniature wireless switch?

    What distance do you need between transmitter and receiver? Ken
  19. K

    designing floor standing and table lamps

    A place to start: http://www.hse.gov.uk/electricity/standards.htm Google: UK appliance safety standard also Google: EU appliance safety standard Ken
  20. K

    Transformer

    ....Yes..... Ken
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