POM #1 - Voltage inverter for breadboards 3.

The PCBs are arrived. I got 11 boards altogether what makes me possible to produce 44 inverters. The board quality is not worst than the ones created by seeedstudio's fusion service, and I got some nice stickers with the boards.

Thanks Ian!
I think this is not the last time I ordered from DirtyPCBs.

POM #1 - Voltage inverter for breadboards 2.

After some fighting (with myself) finally ordered the PCBs.
The dritypcbs immediately create this view from the gerber what is awesome, I'm fell in love. :-)

Yes, you can see it correctly, not just the POM1 on the board. On the whole 7 PCBs on the board. 4 POM1 and 3 PCBs what allows to use various connectors on the breadboard: Stereo RCA, USB B and 3,5 mm jack.

POM #1 - Voltage inverter for brreadboards 1.

I was thinking a lot, how to start this series, to finish the design by end of the month for sure. Among the project in my head this is the simpliest one.
The job of this thing to invert the voltage (typically +5V) arriving to the breadboard, generating a -5V loadable with a few mA-s.
What this is good for? Frequently happening that I need analog circuitry - typically opamps - connected to my digital stuff. In addition, the single supply is not always enough for these (handling DC coupled analog input signal).
The circuit is built around the ICL7660 (LTC1044, LTC1046) and contains only two external components - two 10uF capacitors.
The design is finished. Even I tried it out.
Schematic design:

Built (On breadboard):

The picture requires some explanation. The DMM measures the voltage between incoming ~5VDC from USB and the output of the ICL7660. It would be good to show more values but unfortunately in this very moment I'm not really equipped with multimeters.

PCB design:

Cost structure:

The full material cost is around 2€, what doesn't look to much. In this time I'm intend to try out the Dirt Cheap PCB as manufacturer.