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Luke Denton
Guest
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 Posted:
Sun Dec 11, 2005 9:35 am Post subject:
Low Pwr 10-100Hz Gen |
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Can anyone recommend a low power analog circuit that will run on four
AAA cells and generate a sinewave of several volts amplitude (or more)
that can be varied over the range of 10-100Hz?
Minumum component count is preferred. I usually use an XR2206 for
this but want to reduce current draw to the minimum possible, whatever
that may be in practical terms.
Thank you,
Luke Denton
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Phil Allison
Guest
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| Posted:
Sun Dec 11, 2005 4:56 pm Post subject:
Re: Low Pwr 10-100Hz Gen |
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"Luke Denton" <
| Quote: | Can anyone recommend a low power analog circuit that will run on four
AAA cells and generate a sinewave of several volts amplitude (or more)
that can be varied over the range of 10-100Hz?
Minumum component count is preferred. I usually use an XR2206 for
this but want to reduce current draw to the minimum possible, whatever
that may be in practical terms.
|
** e If you can stretch to 5 AAA cells or a 9 volt battery:
See : http://sound.westhost.com/project86.htm
........... Phil |
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Klaus Kragelund
Guest
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| Posted:
Sun Dec 11, 2005 5:35 pm Post subject:
Re: Low Pwr 10-100Hz Gen |
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Luke Denton skrev:
| Quote: | Can anyone recommend a low power analog circuit that will run on four
AAA cells and generate a sinewave of several volts amplitude (or more)
that can be varied over the range of 10-100Hz?
Minumum component count is preferred. I usually use an XR2206 for
this but want to reduce current draw to the minimum possible, whatever
that may be in practical terms.
|
Use 4000 series chips due to the wide supply range and the low current
consumption. E.g a CD4046 PLL using the VCO for your frequency followed
by a decade counter CD4017 with scaled resistors to make a simple
lookup sine generator. Lastly add a RC filter to smooth the sine
according to your needs. It will however not generate sine with very
low distorsion. You may need to add a low-power amplifier if you need
low output impedance
Regards
Klaus
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Phil Allison
Guest
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| Posted:
Sun Dec 11, 2005 5:35 pm Post subject:
Re: Low Pwr 10-100Hz Gen |
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"Klaus Kragelund" ...
| Quote: |
Use 4000 series chips due to the wide supply range and the low current
consumption. E.g a CD4046 PLL using the VCO for your frequency followed
by a decade counter CD4017 with scaled resistors to make a simple
lookup sine generator. Lastly add a RC filter to smooth the sine
according to your needs. It will however not generate sine with very
low distorsion. You may need to add a low-power amplifier if you need
low output impedance
|
** Sure sounds a lot more complicated than using one 14 pin analogue IC
with less than 2 mA drain to get low THD and low output Z.
............ Phil |
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Phil Allison
Guest
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| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: Low Pwr 10-100Hz Gen |
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"Klaus Kragelund"
| Quote: | Phil Allison wrote:
Use 4000 series chips due to the wide supply range and the low current
consumption. E.g a CD4046 PLL using the VCO for your frequency followed
by a decade counter CD4017 with scaled resistors to make a simple
lookup sine generator. Lastly add a RC filter to smooth the sine
according to your needs. It will however not generate sine with very
low distorsion. You may need to add a low-power amplifier if you need
low output impedance
** Sure sounds a lot more complicated than using one 14 pin analogue IC
with less than 2 mA drain to get low THD and low output Z.
Well depends if you would define 2mA as low power consumption? The 4000
logic solution can be done with less than around 20uA.
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** But in no respect is equivalent.
.......... Phil |
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Klaus Kragelund
Guest
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| Posted:
Mon Dec 12, 2005 1:35 am Post subject:
Re: Low Pwr 10-100Hz Gen |
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Phil Allison wrote:
| Quote: | "Klaus Kragelund" ...
Use 4000 series chips due to the wide supply range and the low current
consumption. E.g a CD4046 PLL using the VCO for your frequency followed
by a decade counter CD4017 with scaled resistors to make a simple
lookup sine generator. Lastly add a RC filter to smooth the sine
according to your needs. It will however not generate sine with very
low distorsion. You may need to add a low-power amplifier if you need
low output impedance
** Sure sounds a lot more complicated than using one 14 pin analogue IC
with less than 2 mA drain to get low THD and low output Z.
|
Well depends if you would define 2mA as low power consumption? The 4000
logic solution can be done with less than around 20uA.
(and that will be a educational project also - won't be if yuo just use
a custom chip)
Regards
Klaus |
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Robert Lacoste
Guest
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| Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Re: Low Pwr 10-100Hz Gen |
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"Luke Denton" <lukedenton@iriscom.com> a écrit dans le message de news:
o9onp1lop420chl4hmeqekqb24a93vn0ea@4ax.com...
| Quote: | Can anyone recommend a low power analog circuit that will run on four
AAA cells and generate a sinewave of several volts amplitude (or more)
that can be varied over the range of 10-100Hz?
Minumum component count is preferred. I usually use an XR2206 for
this but want to reduce current draw to the minimum possible, whatever
that may be in practical terms.
|
Use a nanowatt series PIC microcontroller, with a wake up every millisecond
or so just to update a software-based DDS generator. You will just have to
add an external R/2R network to implement a low cost DAC. If the output
impedance can be high you will end up with a design under 1$, and a power
consumption under may be 100µA.
Yours,
--
Robert Lacoste
ALCIOM - The mixed signal experts
www.alciom.com |
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