According to my rudimentary understanding, they can be configured in different ways, including astable, monostable, and bi-stable. Then I began reading a little more about 555 Timer circuits. For a long time I was in awe of the genius who used a 555 Timer chip to make a capacitor tester. I know just a little about electronics, but not a lot. The battery holder is fastened to the Plexiglass with a screw. I used hot glue to fasten components to the Plexiglass where necessary. I soldered leads to the screw heads under the Plexiglass and I attach an alligator clip to the appropriate screw for the desired resistance range on each test. I tapped the Plexiglass for 8-32 brass screws. There is a selector for different resistance arrays. I place the component on top of the Plexiglass and connect leads below the Plexiglass. Just decide where each component should be located and mark the location for the holes. I drilled holes through 1/8 inch Plexiglas to make a circuit board. Then I pressed the 555 timer chip into the socket when the soldering was finished. I am always nervous about ruining a semiconductor by applying too much heat while soldering, so I used an 8 pin socket and soldered it into place.
These are very inexpensive and very available. I gave away the magazine with the schematic because I believed I would never need it again and we were downsizing. This is something I built from a published schematic late in the 1980s.
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