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  1. Alec_t

    RGB LED controller current extension

    09N03 indicates they're N-channel MOSFETs, so they're presumably low-side drivers for the LEDs.
  2. Alec_t

    Complex electronic circuit design

    Use an Ammeter? Or a current transformer plus meter?
  3. Alec_t

    Power unit from hifi problem

    The linked image is too low resolution to see the component numbers clearly :(.
  4. Alec_t

    Complex electronic circuit design

    Your calculation above will give you the load current for a purely resistive load. Is your 1.25 multiplier to allow for some margin, or for the power factor of the load? Bear in mind that many power ratings assume a steady state and don't allow for startup surges and inrush current (such as...
  5. Alec_t

    Gyroscope Magnetometer Accelerometer Stand Still Readings

    Don't the datasheets for the modules give the necessary info?
  6. Alec_t

    Water cooling control circuit

    That would involve quite rapid temperture changes, whereas the distillation temperature changes may well be much slower. So the optimum PID parameters would not be the same in both cases. Have you tried tweaking the PID values under actual cooling system working conditions? Perhaps boosting the...
  7. Alec_t

    Electrolux dishwasher pcb repair

    It seems the machine thinks there is water above the pump-out level even when there isn't. A possible cause (other than a faulty circuit board) could be a faulty pressure switch or clogged tube leading to the switch. Blowing into the tube may exert a greater pressure than the the water would...
  8. Alec_t

    External Thermometer for Dry Iron

    Welcome to EP! Ideally you would have a temperature senor inside the iron, in thermal contact with the sole-plate, and run cabling to the eternal control. That probably isn't feasible, so IMO the answer is to use either a contactless method involving an infra-red thermometer, or having a temp...
  9. Alec_t

    Water cooling control circuit

    Welcome to EP! The obvious question: have you explored different tuning values for the PID parameters? I wonder if the problem is not so much the solenoid valve but more the coolant system? A very small thermal mass may be more difficult to hold at a constant temp than a larger mass, for...
  10. Alec_t

    Astable 555 Circuit Problem

    Unless C1 has very low leakage its leakage current may well exceed the charging current (< about 1uA) via R1, so C1 will never charge much, so the beeper will continue sounding.
  11. Alec_t

    automatic dark sensor

    That is a potentially DANGEROUS circuit which could kill someone. It also has errors. You should use an isolation transformer.
  12. Alec_t

    I need to leave Australia!

    Under which jurisdiction? US Federal, US State, EU?
  13. Alec_t

    Transformer trouble

    Why are R4 and R5 so high in value? They don't allow much current through the transformer windings.
  14. Alec_t

    need a BASIC flip flop, can't find one!

    You could just use the Set and Reset inputs of a CD4013, with the Clock and Data inputs grounded.
  15. Alec_t

    Repairing a faulty SD card

    That program looks to be a handy tool.
  16. Alec_t

    Learning C language

    Have you tried any of the many online tutorials?
  17. Alec_t

    Need help using phonograph as guitar amplifier

    Welcome to EP! Provided that's not greater than the volume the player already manages then a preamp would help: otherwise you'll need a new power amp.
  18. Alec_t

    A means of closing a JFET switch with a postive voltage?

    Why do you even want a sample-and-hold circuit? Surely you simply need to read the voltage defined by the key states periodically (say every few mS) and play the appropriate sound until that voltage changes?
  19. Alec_t

    4xLCD torches in series without using 4 lots of 3xAAA's

    Perhaps you could pass the water through a glass tube and illuminate that with the UV to kill off any bugs in the water ;).
  20. Alec_t

    Problem on Radio Energy Harvesting circuit- Is Cockcroft Walton circuit fail?

    If your phone has a switched-mode charging circuit your antenna is probably picking up RF hash from that. It may well be marked 2.4GHz, but it will pick up all sorts of frequencies (with varying efficiency).
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