Breadboard dimensions

Hello everyone

I am designing breadboard power supply and need little help.

There are few different breadboard standards on the market and they all have different distances between power rails, so if I place bottom pins on PCB for one type of breadboards, power supply will not fit on others.

Then I decided to simple left place for more headers to be placed on PCB with different distances between them so that power supply gets more flexibility and thus could be used on more breadboards with different dimensions.

Since I have only one type of breadboard I need to get more info about other breadboards but there is no exact dimensions between power rails on the internet or datasheets so could you please fellow designers help me with this and measure distance between power rails of your breadboards?

I have always used a red and black wire to make those connections.

I know me too Distance between power rails for most Breadboards is 43.18mm (1.7 inches)

I would make a power supply board that sits over the bread board and cover up only one row. Pins that stick down from the PCB connect power to the bread board.

Or just forget about the power rails and have them connected like any other pin, into the main area and have the user connect the power pins to the correct rail.

Save yourself some trouble: https://www.sparkfun.com/search/results?term=power+supply