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  1. WHONOES

    Shaded pole motor.

    Thanks for the compliments. I like making things. PWM works well on dc motors and is simple to realise.
  2. WHONOES

    Shaded pole motor.

    It's not as big as it might look. It is 500mm to the top of the column. The base is 200mm square whilst the table is 150mm square. The reason for using pulleys was simply for torque multiplication for larger holes or speed ditto for smaller holes. The motor is one that I got from Ebay. It is...
  3. WHONOES

    Shaded pole motor.

    Main problems with shaded pole motors are low starting torque and poor efficiency of around 25%. You would be better of using dc motors and PWM controllers. Incidentally I built a small pillar drill for making holes in PCB's. It uses a 30watt dc motor. The only speed control it has is pulleys of...
  4. WHONOES

    img stage line sta 500

    You are very unlikely to find a schematic for your amp. Manufacturers are extremely reluctant to release such data. I had a quick search and found nothing.
  5. WHONOES

    400 Hertz at 120 V

    You will not get a meaningful square wave out of a mains transformer. It should be relatively easy to get 120V pk to pk from a purpose built amplifier. How much building are you prepared to do?
  6. WHONOES

    400 Hertz at 120 V

    Is the 120V peak to peak or RMS.
  7. WHONOES

    LI-ION 18v Battery Pack

    Probably Chinese junk!
  8. WHONOES

    Battery charging question

    Sorry, but your quote of the charge current is not strictly correct. See the attached link for a more comprehensive description for charging SLA's particularly page 4 about 2/3 of the way down. https://www.silvertel.com/images/technical-articles/charging_sealed_lead_acid_batteries.pdf
  9. WHONOES

    Battery charging question

    No. The charge current is to high for your sealed lead acid battery. It should be charged at a current of not more than 25% of capacity. You also need a charger that starts in constant in current mode and then switches to constant voltage mode when the charge current dips below the level set for...
  10. WHONOES

    SPI Signal Overshoot (to WIFI chip)

    If you have a decent scope lead, it should have a method of compensation. This normally comprises a small variable capacitor within the probe body. There will then be a small hole in the body of the probe through which you can pass a non conductive driver (normally provided with the lead). Your...
  11. WHONOES

    advantage and disadvatnge of AC to DC converter circuit

    It is not safe. If you touch any of the wires, instant death will result. I don't need to try it, common sense and 50 years in electronics is all I need to offer the warning given.
  12. WHONOES

    advantage and disadvatnge of AC to DC converter circuit

    Don't
  13. WHONOES

    Ignition Coil Driver Questions

    I look forward to your questions. Glad you have had a successful expedition and that it is working as you wanted.
  14. WHONOES

    Capacitive dropper circuit

    Have to disagree with you. The circuit will be subjected to the full peak to peak voltage of the mains supply. The 1N4007 diode that is reverse connected across the LED's protects them from the half cycle of the mains over which they will not be conducting. If it was not there, the LED's would...
  15. WHONOES

    Kipor ig 3000 cdi bypass

    They are all the same as far as I can remember. Just look up RCEXEL ingnition. Many online model shops sell them. One thing to be aware of is that they have a number of different spark plug connectors (they are permanently attached) available so make sure you get the correct type for you engine...
  16. WHONOES

    Z5500 no sound

    First of all, you should check the mains fuse if you haven't already done so. Then, if you can disconnect the transformer secondary's, check their voltages. It may be easier to remove the ac connections from the bridge rectifier instead.
  17. WHONOES

    Kipor ig 3000 cdi bypass

    The whole thing needs just a 4.8 to 6V dc supply which could be a minor but not insurmountable issue. The ignition coil is contained within the control box. All that you have to wire up, is the power supply to the box, and the lead for the Hall sensor. The HT cable for the spark exits the box as...
  18. WHONOES

    Resistor Question

    The system you are enquiring about was introduced to eliminate errors as it was far to easy for the decimal point to be missed and the wrong value used instead. The "R" suffix indicates that the value is below 1k and it replaces the omega symbol.
  19. WHONOES

    Kipor ig 3000 cdi bypass

    They are used on large 4 strokes as well.
  20. WHONOES

    Capacitive dropper circuit

    You shouldn't need to include a resistor for inrush current. Also the load is so small, I wouldn't worry about PF correction as the circuit would only be using 7 watts of power.
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