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  1. GPG

    powered computer speaker

    Did you get any documentation with the amp? A high on the Mute pin = turns the amp off
  2. GPG

    Changeover Switch Relay?

    Is it just one motor and you wish to reverse direction each application of power? Are your limit switches already sorted? What is the timing.
  3. GPG

    using solid state relays with servos

    There's a max voltage drop of 1.5V in the datasheet.
  4. GPG

    2-stage Class A Amplifier: Gains(voltage and power)

    Since the load is the input of an opamp the gain could be made much higher by setting the current lower and Re lower and Rc higher and biasing accordingly. The optimum for low noise depends on the input impedance http://datasheet.eeworld.com.cn/pdf/272577_SECOS_2N2222A.html Starting by setting...
  5. GPG

    Arcs from Van de Graaff Generators and Tesla Coils

    500KV/10KV = 50cm
  6. GPG

    Portable Speaker Project

    A bit of light reading:) http://www.ti.com/lsds/ti/power-management/battery-management-products-overview.page
  7. GPG

    Microcontroller LiPo Charger

    http://www.ti.com/lsds/ti/power-management/battery-management-products-overview.page
  8. GPG

    ACS712 hall sensor

    http://www.ti.com/lit/ds/symlink/lmc6482.pdf Looks like a suitable amp. Will run off 5V single supply and swing close to the supply. The choice of capacitor. not electrolytic. There are MLCC caps with low leakage. C*V = I*T Insert the values and this will give you the maximum C. Use ~ 2-3mA for...
  9. GPG

    Material For Touch Screen

    http://www.mmt.io/transparent-lcd-touchscreen-display-hypebox/
  10. GPG

    powered computer speaker

    http://www.diodes.com/_files/datasheets/PAM8610.pdf They are stereo bridge amps so you have 3 to spare!
  11. GPG

    Portable Speaker Project

    There are a few other factors to take into account. The peak to average value of the program material. (10-16dB) this works in your favour. The total capacity of the battery is not available,and it may damage the battery if exceeded. Cars carry a battery with 5x or more capacity. See if you can...
  12. GPG

    Need a Relay with Timer

    Works ok now?
  13. GPG

    Motorcycle riding robot

    Exactly what not to do in a corner
  14. GPG

    Need a Relay with Timer

    ^This listing (391179622849) has been removed, or this item isn't available. Please check that you've entered the correct item number Listings that have ended 90 or more days ago won't be available for viewing.
  15. GPG

    3 phase fan control

    Fisher and paykel factory is ~150K down the road. They started with the Gentle Annie motor (a story in itself) with a ribbed belt reduction and then got rid of the belt with the larger diameter (more torque) smart drive motor. Both sensorless. Still using it...
  16. GPG

    3 phase fan control

    So do a majority of VCRs for drum and usually capstan motors. Sinusoidal and sensorless controllers are available. http://www.allegromicro.com/en/Products/Motor-Driver-And-Interface-ICs/Brushless-DC-Motor-Drivers.aspx http://ww1.microchip.com/downloads/en/DeviceDoc/22310b.pdf...
  17. GPG

    ACS712 hall sensor

    Positive peak sample/hold. If you need to reset add a transistor across the capacitor and switch on for reset to 0V Use jfet input or cmos amps for longer hold time
  18. GPG

    mosfet shorted after i connect them in parallel ? did i doing it wrong ?

    I think you should raise the drive current. Perhaps something like http://www.ti.com/lit/ds/symlink/ucc27322-ep.pdf There are others. You may find that the single fet is cooler. There is also the possibility of uncontrolled flyback voltages on the drain. Got a scope? with HV probe?
  19. GPG

    logging current over a 24 hour minimum period

    Never seen one. Looks like it comes with SW for a number of platforms. Enquire at site.
  20. GPG

    Need a Relay with Timer

    How are you with a soldering iron, a bit of vero board and a few components, eg 555 timer diodes resistors transistor etc. Failing which do you have someone who can do that.
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