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Pwm (0-5 v) to 0-15v — Parallax Forums

Pwm (0-5 v) to 0-15v

ArchiverArchiver Posts: 46,084
edited 2003-01-12 17:39 in General Discussion
My project needs to multiply the StampII output
from 0 - 5 volts after PWM comand three times (3)
instead 0 - 5 volts to 0 -15 volts but with source 5 volts
or 9 volts
Knows someone if exist technicaly answer ?
Thanks
Michalis



[noparse][[/noparse]Non-text portions of this message have been removed]

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-01-12 13:54
    If you only need very low current, you probably could come up with some sort
    of charge pump the Stamp could PWM to get the higher output.

    Original Message


    > > My project needs to multiply the StampII output
    > > from 0 - 5 volts after PWM comand three times (3)
    > > instead 0 - 5 volts to 0 -15 volts but with source 5 volts
    > > or 9 volts
    > > Knows someone if exist technicaly answer ?

    > If I understand your question, you have a PWM output that needs to
    > swing between 0 and 15 volts but your only DC source is either 5 or 9
    > volts. What I would suggest is a small DC-DC Boost converter to
    > raise the 9 v to 15 or add another 9v battery. The Stamp output pin
    > is then connected to an open-collector output inverter or buffer such
    > as a 7407 or a simple transistor circuit with the output pulled up to
    > 15v through a suitable resistor.
  • ArchiverArchiver Posts: 46,084
    edited 2003-01-12 13:59
    --- In basicstamps@yahoogroups.com, "Michalis Vrakidis"
    <michvra@h...> wrote:
    > My project needs to multiply the StampII output
    > from 0 - 5 volts after PWM comand three times (3)
    > instead 0 - 5 volts to 0 -15 volts but with source 5 volts
    > or 9 volts
    > Knows someone if exist technicaly answer ?
    > Thanks
    > Michalis
    >
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]

    If I understand your question, you have a PWM output that needs to
    swing between 0 and 15 volts but your only DC source is either 5 or 9
    volts. What I would suggest is a small DC-DC Boost converter to
    raise the 9 v to 15 or add another 9v battery. The Stamp output pin
    is then connected to an open-collector output inverter or buffer such
    as a 7407 or a simple transistor circuit with the output pulled up to
    15v through a suitable resistor.

    Hal
  • ArchiverArchiver Posts: 46,084
    edited 2003-01-12 17:39
    Thanks for your answer but if you want
    I yould like more specific details
    the current is about 2 mA

    Michalis

    > If you only need very low current, you probably could come up with some
    sort
    > of charge pump the Stamp could PWM to get the higher output.
    >
    >
    >
    Original Message
    >
    >
    > > > My project needs to multiply the StampII output
    > > > from 0 - 5 volts after PWM comand three times (3)
    > > > instead 0 - 5 volts to 0 -15 volts but with source 5 volts
    > > > or 9 volts
    > > > Knows someone if exist technicaly answer ?
    >
    > > If I understand your question, you have a PWM output that needs to
    > > swing between 0 and 15 volts but your only DC source is either 5 or 9
    > > volts. What I would suggest is a small DC-DC Boost converter to
    > > raise the 9 v to 15 or add another 9v battery. The Stamp output pin
    > > is then connected to an open-collector output inverter or buffer such
    > > as a 7407 or a simple transistor circuit with the output pulled up to
    > > 15v through a suitable resistor.
    >
    >
    >
    >
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