Electronics > Projects, Designs, and Technical Stuff

Solderless vs. soldering - what a difference (measuring 3V LDO)

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dusan:
I bought ME6209A30M3G from aliexpress and I got underwhelming results when I was testing in on breadboard, but on second measurement I got significantly different results so I soldered everything on perfboard and difference was huge. Here are both measurements, first is on breadboard, second is soldered on perfboard. Just an observation.

ftg:
Images comparing how they were setup might also offer us clues.
But my guess would be the thinner wires and worse decoupling on the solderless breadboard.
Soldering the connections makes for more reliable and lower resistance connections.
Assuming there was no other difference in the parts used.

tggzzz:
Yet another example of why solderless breadboards are a good way of misleading yourself[1] and discouraging beginners :)

Fortunately there are better prototyping techniques, technologies, and components: https://entertaininghacks.wordpress.com/2020/07/22/prototyping-circuits-easy-cheap-fast-reliable-techniques/ It looks like you know some of them, but there might be a few surprises there.

[1] another example: https://entertaininghacks.wordpress.com/2024/03/16/practical-traps-with-a-one-transistor-audio-amplifier-solderless-breadboards-and-oscilloscopes/

shapirus:
Even with a solderless breadboard... Something must have been assembled VERY badly to cause such a big voltage droop at such a low current.

Solderless breadboards can be surprisingly well performing, if you know what you're doing.

tggzzz:

--- Quote from: shapirus on May 20, 2024, 03:04:32 pm ---Even with a solderless breadboard... Something must have been assembled VERY badly to cause such a big voltage droop at such a low current.

Solderless breadboards can be surprisingly well performing, if you know what you're doing.

--- End quote ---

A bit of oxide coating here, a leaf spring previously forced apart by a large diameter lead there, add a sprinkling of unnecessary L and C - and soon you have a problem.

The question is not whether solderless breadboards can be good enough, the question is what is the probability they will be good enough.

It takes a lot of experience to guesstimate that, and someone with such experience will probably choose to avoid needing to guesstimate and hope :)

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