Re: need to measure low freq. DC waveform
- From: Max65 <mporzio@xxxxxxxx>
- Date: Sun, 18 May 2008 13:48:12 -0700 (PDT)
On 18 Mag, 09:06, mattyg1...@xxxxxxxxxxx wrote:
i need to measure a low frequency waveform from a DC circuit (voltage
up to 200mV). I need a sample rate of around 10Hz. to buy an
oscilloscope for this is a total overkill. I was thinking of using the
soundcard, but then realised it's AC coupled. any suggestions on a
cheap method to find this measurement?
you could use your sound card chopping the incoming signal with a
fixed frequency of 10kHz or so, by means of a cmos switch such as the
CD4066 (if you need precision, it is better you use one DG411 or one
next generation switches with lower RDon resistance).
To achieve a good switched signal place one switch in series and one
in parallel to the sound card input, and drive the second one with the
logic complement of the first.
Bye,
Massimo
.
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