Is there a simple, single transistor voltage amplifier to give me a voltage gain of at least 4X, using an input voltage of 0.1-0.3v?
I'm using the LM35 thermometer IC in a thermostat application; it gives a voltage of 10mV per °C. My LM339 comparator seems to have hysteresis of about ±5 mV. That means my thermostat has about ±0.5°C of hysteresis. Not bad, but if I could amplify the LM35 voltage then I think I could decrease my temperature deadband.
I'm vaguely familiar with how to amplify an AC audio signal (see http://www.falstad.com/circuit/e-ceamp.html), but in my case it's a pure DC I need to boost. Can I simply omit the decoupling caps?
I'm using the LM35 thermometer IC in a thermostat application; it gives a voltage of 10mV per °C. My LM339 comparator seems to have hysteresis of about ±5 mV. That means my thermostat has about ±0.5°C of hysteresis. Not bad, but if I could amplify the LM35 voltage then I think I could decrease my temperature deadband.
I'm vaguely familiar with how to amplify an AC audio signal (see http://www.falstad.com/circuit/e-ceamp.html), but in my case it's a pure DC I need to boost. Can I simply omit the decoupling caps?