| ??? 06/24/07 15:34 Modified: 06/24/07 16:03 Read: times |
#141187 - Now I see what you mean! Responding to: ???'s previous message |
Richard said:
They provide ground and power distribution facilities but not truly low-impedance ones, and certainly not isolated grounds. The result is a really long and convoluted path back to the true ground reference at the regulator or power/GND terminals. Ahh, now I see what you mean! I don't use these ground distribution facilities, I even don't have them on my breadboard! I use several of the contacts for ground and route it over the breadboard like a ground mesh or grid. And I always use RC-elements for the power supply decoupling, not only on the breadboard, but with all my projects. Analog devices need RC-decoupling at the power rails. Riochard said:
... but not enough to provide a solid return for a circuit with several components, when one takes into account that the same return path is used for contrl/reference. Bloody hell, that must be avoided, of course! Richard said:
They are suitable, perhaps for "playing," with a circuit,... Yes, that's exactly what I do: I play with the circuit, to find out the performance during conditions that are not explained in the datasheet. For instance, how behaves a second order bandpass fabricated by an OPamp, when being overdriven? Is the inverting input exceeding the common mode input voltage range? Such things. Yes, "playing" is the right word. Just to get a better idea of the behaviour of circuit. And then you can change the circuit extremely fast: Add a cap here, remove diode clamps there. Changing the Q of bandpass, by changing some resistors, etc. That goes extremely fast, when using a breadboard, and I wouldn't want to take the solder machine for that. Kai |
