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To safely power something from your PC, the attached loads have to be limited to a safe current in order to avoid the chance that a short circuit migh...
Any electronic project starts with a circuit. This one has a PNP power transistor in series with the +12V line from the PC. The collector supplies the...
A power connector was salvaged from a 3.5" floppy drive. A scrap of copper clad board was dug up from somewhere. A piece of board slightly wider than...
The pictures show the connector before and after soldering. The middle two pins are ground. One outer pin is +5 V, which we do not use. The other oute...
The diagram has been marked with the components already fitted. This is a great aid in constructing a circuit. You go on soldering and marking, and wh...
The copper on the board has been cut to isolate the live pins and bypass capacitors soldered on. We are not using the +5V line at present, but I fitte...
The components around the small transistor has been fitted. The one pictured is not the BC147 in the diagram, it was rescued from some board that had ...
Mark the diagram in order to match the progress of your work. Make this a habit, as it is easy to overlook a vital component in the heat of the solder...
All components are now on board and it was tested. Another component change was necessary before it would work. That resistor at the output, originall...
I present the circuit diagram and photos labelled for cross reference. I have made a circuit board layout in case somebody out there wishes to etch a...
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