Boncuk
New Member
Hello all,
I guess you all run into the same problem experimenting with a circuit built on a breadboard, especially if more than one supply voltage is required.
The workbench is full with twisted cables which make it likely to grab the wrong one or just to cause a short circuit somewhere.
There are power supplies for breadboards, but taking a close look at the device you will notice that they all waste a lot of precious place which could be used for the circuit to test.
I made a design for a Wishboard No 204-1. The power supply covers just 6 pins of the board, two for each line of power supply. There is a lot of unused space on the mounting plate (normally occupied by 3 banana type plugins). Removing those and replacing them with a simple power supply, delivering 4 different voltages, +12V, +5V, GND, -12V and -5V there is supply for almost any application.
Each line on the board can be jumpered for a different (or equal) voltage. The maximum current for the positive and negative branch is 1A each.
To avoid inadverting shorting of e.g. GND and -12V all the jumpers are out of line which makes it difficult - if at all - to make a wrong jumper setting. Using just three jumpers (for five combinations) for each suppy line it is almost impossible to do anything wrong.
The board can be made single sided using straight wires between jumper rows.
Have a look how the assembly fits onto the breadboard. Everybody interested in the circuit layout will be welcome to receive the Eagle files.
Kind regards. Have a nice day
Boncuk
I guess you all run into the same problem experimenting with a circuit built on a breadboard, especially if more than one supply voltage is required.
The workbench is full with twisted cables which make it likely to grab the wrong one or just to cause a short circuit somewhere.
There are power supplies for breadboards, but taking a close look at the device you will notice that they all waste a lot of precious place which could be used for the circuit to test.
I made a design for a Wishboard No 204-1. The power supply covers just 6 pins of the board, two for each line of power supply. There is a lot of unused space on the mounting plate (normally occupied by 3 banana type plugins). Removing those and replacing them with a simple power supply, delivering 4 different voltages, +12V, +5V, GND, -12V and -5V there is supply for almost any application.
Each line on the board can be jumpered for a different (or equal) voltage. The maximum current for the positive and negative branch is 1A each.
To avoid inadverting shorting of e.g. GND and -12V all the jumpers are out of line which makes it difficult - if at all - to make a wrong jumper setting. Using just three jumpers (for five combinations) for each suppy line it is almost impossible to do anything wrong.
The board can be made single sided using straight wires between jumper rows.
Have a look how the assembly fits onto the breadboard. Everybody interested in the circuit layout will be welcome to receive the Eagle files.
Kind regards. Have a nice day
Boncuk
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