Re: need to measure low freq. DC waveform

mattyg1884@[EMAIL PROTECTED]
 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?

A Voltage to Frequency converter can be as simple as a UJT oscillator 
IE about 3/4 resistors 2/3 Caps a UJT and a battery or a 555 IC and some 
electronic glue.  CHEAP enough ?

Yukio YANO