Design of precision circuitry??? I'm currently working on a circuit that is so sensitive that if I even so much as breath on it for just a moment, it becomes completely useless as my signal will become completely saturated. While the circuit works very well (when I'm not breathing on it), even slight variations in room temperature completely destroy its precision. Currently I'm just using generic ceramic resistors and capacitors which is the #1 source of my temperature drift error. My problem is, that I know hardly anything about precision analog circuit design and what components I should be looking for as far as capacitors and resistors go. For example, I need a very low drift (<100ppm???) 10pf cap but I don't know what kind I should get. I used to think polystyrene was the best choice for precision stuff but they don't make it anymore. Now searching online I see some sources say C0G rated ceramic caps are the best and others say polystyrene carbonate is the best, which is it? As for resistors, theres thinfilm, metal oxides, ceramics, etc and I have no idea what to look for. Can anyone help me or give me a source of what types of components I should be looking for? My circuit is going to be inside of an enclosure in a laboratory type environment so I just need precision and low drift, not durability.