I am building a smallish project on a mini Breadboard (14 rows, 140 tie points...). I want to be able to power it from a Wall wart, and I will be using some micros (Attiny85) in it, so I need a steady 5V. I'll be using this switch-mode 9V wall wart.
Since it is switch-mode regulated, do I need all the fuses and filtering caps on my regulator?
My advice is simply not to use solder less bread board. Use perf board or strip board instead. Use sockets for all the ICs and solder things in place. It will compress greatly.
If you want small, go surfacemount.
with the right layout, you should be able to design a board for this that's less than 2" x 2".
If you can use a vertical battery mount, you might be able to squeeze it into 1" x 2".
and that would be with all components except the ATTiny85
I suspect you don't need such a large 100uF on the regulator input side, just a 1uF ought to be enough - what do the datasheets say for your particular regulator?
Voltage regulators as standard have over current and over temperature detection and shutdown...
Then use at least the next biggest.
You can always add extra large ones as well as small ones. The small ones take care of the high frequency stuff and the large ones cover the low frequency stuff.
Now you are changing the parameters. I got the impression that you were going to purchase a specific wall wart for your project so I suggested a different specific wall wart that would suit your situation more closely.
Yep. I'm going to buy two 1" perf boards and stack them. One for power regulation, the other for the actual circuit. Then I can screw them into the enclosure.
baum:
Or, in an effort to conserve space on the breadboard, can I get away with just the regulator?
Strictly speaking, the 9V adapter probably has an output capacitor of at least 100 uF. If you assume that that's good enough (which is "okay" but not "super robust") then all you REALLY need is the regulator and C2. You really do need C2. However, because C2 goes between Vout and GND, it doesn't use any more rails on your breadboard -- you can plug it in the same rails as the regulator already is mounted in.