Electronics > Beginners

Difficult breadboading a LM324N

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Mechatrommer:

--- Quote from: dcbrown73 on August 11, 2019, 07:21:05 pm ---While I'm sure it's not an issue on a pcb, it makes for more of an issue on a breadboard.  Especially if you are a neat freak in that you at least like to be able to see (read understand) the circuit layout once it's finished. 

--- End quote ---
no issue at all for me. if i cant stick my jumper in because there are jumpers on the left and right, i'll just use the hole diagonal to them, so my jumpers on breadboard look like zig zag arrangement. otoh pcb is a nightmare to understand just by looking, esp if traces go under the IC or the bottom layer, worse if more than 2 layers pcb.

ledtester:
Check the input common mode range to make sure you're supplying a valid voltage when you wire it  as a voltage follower. For the LM324 this includes GND (in a single supply configuration), so this is ok. In general, though, I like to use 1/2 V+ as pictured in Fig. 2 here:

http://www.ti.com/lit/an/sboa204a/sboa204a.pdf

Zero999:

--- Quote from: ledtester on August 12, 2019, 07:27:51 pm ---Check the input common mode range to make sure you're supplying a valid voltage when you wire it  as a voltage follower. For the LM324 this includes GND (in a single supply configuration), so this is ok. In general, though, I like to use 1/2 V+ as pictured in Fig. 2 here:

http://www.ti.com/lit/an/sboa204a/sboa204a.pdf

--- End quote ---
Yes, that's good advice and the LM324's common mode range does include ground so it's fine in this case. Generally and extra potential divider to get half the supply voltage is unnecessary. If it's a dual supply, then use 0V or if it's a single supply and the op-amp's common mode range doesn't include 0V, then there's generally a 1/2V node it can be connected to. Another option is the output of another op-amp.

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