Hi everyone,
I'm new to the forum and am pleased to be a member. I have been working on a project where I keep a light bulb at a constant temperature using op-amps. Essentially I take the output of a thermocouple, feed it into an in-amp to get a decent gain, and feed the output of that into a comparator. Depending on polarity of that output either a) light a green LED or b) light a red LED and turn on a fan which points at the bulb to cool it down. Pretty simple idea, I'm just encountering lots of problems when building it.
The output of my last stage won't power the fan. Before connecting the load I get a saturated output of 10V. Connecting the fan (which has a load resistance of 47k) drops the output voltage to 2V and produces a strange beeping sound from the fan. The fan works fine when tested by connecting to a DC source. Why is the op-amp losing output voltage to such a large load and refusing to power the fan? Thank you very much for any suggestions.
I'm new to the forum and am pleased to be a member. I have been working on a project where I keep a light bulb at a constant temperature using op-amps. Essentially I take the output of a thermocouple, feed it into an in-amp to get a decent gain, and feed the output of that into a comparator. Depending on polarity of that output either a) light a green LED or b) light a red LED and turn on a fan which points at the bulb to cool it down. Pretty simple idea, I'm just encountering lots of problems when building it.
The output of my last stage won't power the fan. Before connecting the load I get a saturated output of 10V. Connecting the fan (which has a load resistance of 47k) drops the output voltage to 2V and produces a strange beeping sound from the fan. The fan works fine when tested by connecting to a DC source. Why is the op-amp losing output voltage to such a large load and refusing to power the fan? Thank you very much for any suggestions.