Soundcard in temperature control system?

Hi!
I would like to use soundcard's output to power heater (via amplifier, of course) in a temperature control system. I figured out I could use 2nd soundard (or a virtual one) to get rid of Windows and other applications' sounds.
But what is the right (good) way to output a _continuous_ tone?
Thanks everybody!
Vitaly

Thanks for your interest, I am in no way offended. The system is a small (1 m long, 16 mm diameter) measurements probe. It is submerged in the liquid nitrogen (helium). The sample holder (~30 mm long, ~10 mm diameter) is inside the probe, close to the bottom and has a small heater (~100 Ohm resistance, maximum necessary power ~1 W). The whole probe is filled with gas (helium) to ensure proper thermal exchange between the sample holder and the walls of the probe. It's all rather conventional in low temperature measurements.
How? I can measure sample holder's temperature (takes a diode or a resistor sensor and a DMM connected via GPIB). You are right, PID regulator will be used to calculate the necessary power. So I want to connect PID regulator's output to the amplitude (volume) control of the soundcard. I do not quite understand what you mean by "Unless your output frequencies are very low, I cannot see any benefit of trying to use a sound card." But I will connect the soundcard's output to the amplifier/rectifier. I only rectify to avoid electromagnetic interference between the heater signal and measurements currents (very low ones), otherwise I could even connect the heater directly. For the same reason digital pulse width modulation and the like cannot be used.
Why? Because basic analog output card costs ~$300, I think it's a real waste in my case. However, seeing (hearing) that it's not that simple to get true continuous sound, I might be forced to change my mind.
Best wishes,
Vitaly

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1 rue antonin artaud
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Master in Electrical and Control Systems Engineering
Option Embedded
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Message Edité par salimo le 11-04-2009 04:35 PM
~~~~~~~~~~~~~~~~~~Looking for a LABVIEW JOB (In EUROPE)>~~~~~~~~~~~~~~~~~~
**The Best Way To Predict**The**Future Is To Invent It**
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CV_SalimDARWICHE_EN_S.doc ‏229 KB

Message Edité par salimo le 11-04-2009 04:36 PM
~~~~~~~~~~~~~~~~~~Looking for a LABVIEW JOB (In EUROPE)>~~~~~~~~~~~~~~~~~~
**The Best Way To Predict**The**Future Is To Invent It**

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