Hello,
I'm working to prototype a 2-stage thermocouple amplifier, using a 2-channel general purpose op amp IC.
I reviewed design notes from datasheets, Microchip, and my college EE textbooks.
I then assembled my simple design (which is a clone of other common designs) onto a small solderless breadboard.
I find that there is significant noise and oscillation in the output from the amplifier. The output fluctiates wildly if a handle the breadboard - particularly if I push on part of it or tap it.
I used bypass caps for my power supply, and also tried adding caps in parallel with the feedback resistor(s).
My questions are:
1) Has anyone else experienced this kind of noise using solderless breadboards? Is it just a crappy board?
2) Is there a better way to prototype? I read in a Microchip AN that using perf board for prototyping can introduce noise and oscillations.
Any comments or suggestions would be appreciated.
thanks
Eric
I'm working to prototype a 2-stage thermocouple amplifier, using a 2-channel general purpose op amp IC.
I reviewed design notes from datasheets, Microchip, and my college EE textbooks.
I then assembled my simple design (which is a clone of other common designs) onto a small solderless breadboard.
I find that there is significant noise and oscillation in the output from the amplifier. The output fluctiates wildly if a handle the breadboard - particularly if I push on part of it or tap it.
I used bypass caps for my power supply, and also tried adding caps in parallel with the feedback resistor(s).
My questions are:
1) Has anyone else experienced this kind of noise using solderless breadboards? Is it just a crappy board?
2) Is there a better way to prototype? I read in a Microchip AN that using perf board for prototyping can introduce noise and oscillations.
Any comments or suggestions would be appreciated.
thanks
Eric