Breadboard voltages

Hi gang,

Anyone got any take on what voltage can be handled in a breadboard, and does ac vs dc make any difference?

Anyone popped one?- and if so how much did it take.....


I mostly use low voltages 5 - 24 VDC however, I have made a power supply design with 120 VAC input with no problems. Haven't seen any ratings for the breadboard though.

the voltage that can be handled by breadboard without flashovers is presumably quite high but can be diminished by contamination. IPC 2221 and 9592 give you about 400V dc or ac p-p for 2,54mm. But there are more aspects to this. Having voltages that high on exposed conductors is not advisable. 50Vac or 110 Vdc is the regulatory limit here in sweden based on IEC 60479-1 .

Also breadboards cannot carry high currents.

nilton61: Having voltages that high on exposed conductors is not advisable.

No argument from me there.

That's one of the reasons I bought a mains AC- low voltage AC transformer, all nicely sealed with screw terminals for the output, and it plugs into the wall socket. I wanted to measure AC as part of my oscilloscope learning curve and was reluctant to jam the probes into the wall even though the 'scope can handle mains voltage.

But now I want to rectify that to show the AC and DC traces. That transformer output is about 50VAC p-p so i should be ok with diodes on the breadboard.

Thanks for the reply.

LarryD: Haven't seen any ratings for the breadboard though.

Yeah me neither, that's why I thought I'd ask what folks had tried.

Thanks for the reply.

Measuring AC/DC with a scope, problems with scope chassis grounds.


I'll watch those thanks Larry.

That guy sounds South African....

Very interesting.... I have a mains output UPS so I'll do some playing.

the max voltage depends on the distance between two strip lines. Have here a list in front of with the minimum distances for various voltages. For 125 V you should have 0,25 mm between two strips. If you double the voltage to 250 V you should have already 1 mm in between and for 400 V you need 2 mm "air" between. Now you can decide by yourself if your breadboard is suitable or not :)

Hi, I wouldn't go over 24V. 100V or higher would be dangerous for the op and the connections are not permanent or locked in. If a live wire popped out, not good.

Tom.... :)

TomGeorge: I wouldn't go over 24V.

Tom with AC what would that be?- With the AC - AC transformer I got, I get (iirc) 18VAC shown on my meter , but my 'scope says about 25 each way for peak-peak of 50 odd. 18 is RMS of 25. Which of those corresponds to your 24V figure? RMS, one way peak, or peak-peak?

I had it hooked up to breadboard yesterday, using the breadboard to connect one side to a diode. Seemed ok... (Until, that is, by stupidity I accidentally caused a short and popped the fuse in the transformer. Can't blame that on the breadboard.... But it does show how easy it is do that with wires flapping around, and I'm glad I went LV not mains for experimenting.)

Says here 36 volts 2 amp.


Says here 36 volts 2 amp.

Cool to see an actual maker’s number. But if that was AC, which number should be <=36… RMS, one side peak, or peak-to-peak?