Electronics > Beginners
Voltage Drop at Breadboard
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windsmurf:

--- Quote from: tooki on March 10, 2019, 05:02:50 pm ---Breadboards may be categorically unsuited to some types of circuits, but they're of incredible value to beginners especially. There's a TON of value in being able to quickly lash together a circuit and play around. It takes far longer to solder something together, and making changes are even harder still. I think you guys forget that breadboards are, above anything else, a learning tool — you guys are experienced and knowledgeable, but for those of us still figuring things out, breadboards are incredibly useful.

Just don't buy cheap!

--- End quote ---

What is a good breadboard kit to buy? Thx.
rdl:

--- Quote from: windsmurf on March 11, 2019, 12:42:45 am ---What is a good breadboard kit to buy? Thx.

--- End quote ---

https://www.eevblog.com/forum/chat/3m-breadboards-for-cheap/

Note that the first post also has links to three other threads about breadboards.
Peabody:
Julian Ilett has a recent Youtube video that appears to show a source of good, cheap breadboards:



The Ebay.com link for this item appears to be this:

https://www.ebay.com/itm/253085438896
tggzzz:

--- Quote from: sleemanj on March 11, 2019, 12:12:03 am ---There is no magic, it's resistance, the question is where is the resistance. 

--- End quote ---

Indeed. But don't forget the inductance of a wire, 1nH/mm being a rule-of-thumb. Hence a 6" wire (as commonly used with solderless breadboards) adds ~150nH.


--- Quote ---Chuck a decent sized cap across each device's power connection on the breadboard and that will help matters (if they need helping, if everything works, why worry).

--- End quote ---

And don't forget to calculate the LC resonant frequency and see if it is anywhere in the circuit's/components' frequency response (N.B. not signal's frequency response!).
anbudroid:

--- Quote from: Zero999 on March 10, 2019, 06:20:51 pm ---I'm not convinced the breadboard is this issue in this case. Whenever anyone mentions breadboard, there's always this discussion which is valid, but is also a distraction.

I'm more suspicions of the DC:DC converter.

anbudroid,
Did you measure the voltage directly at the DC:DC converter's input and output terminals on the board?

--- End quote ---


Yes sir, my first picture shows the DC-DC Output voltage at the board level itself. am not think the problem is because of DD-DC . this problem persist even if I omit the DC-DC and plug the bench power supply directly to the breadboard.

    After reading all of the discussion and investing some times around the breadboard I finally convinced myself that breadboard are only worth to work with digital signals and non-precious analog circuits. if we want to test any project with confident, first thing is "say no to breadboard"

    because am not conscious about this kids of error previously when I work with switching applications . thinks create problem only when I need analog.
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