titous wrote:I do not have an oscilloscope :(
They are a hefty investment for a hobby.
You can get the same general effect with a cheap analog multimeter.. the needle-and-dial kind you can get for $10 at Walmart. A galvanometer reacts to changes more or less instantly while a digital meter needs the signal to remain stable long enough for it to count a given number of pulses.. usually about 2000. For signals that change quickly, you can at least get a general idea of what's going on by watching the needle pop back and forth.
** EDIT **
Let me qualify that statement about 'scopes: a new digital scope is a 'swallow and write the check' investment.. the Rigol DS1052E is a good performer for its price, but still costs about $400.
You can get old analog scopes for a song though.. stuff in the 25MHz range that's 25-40 years old and getting cleaned out of the closet in a lab somewhere. Those go for $25-50 on eBay, and some people will send them to you for the cost of shipping, and if they work at all they'll probably be a fantastic investment.
If/when you get to the point where you want to acquire a scope, don't make the mistake of assuming digital is better than analog.. they're actually different machines that do similar things, but neither is a complete replacement for the other. A good digital scope is the electronic equivalent of a camera.. it can store a sequence of samples thousands of readings long, so you can see everything that happened in a fairly long window of time. A good analog scope is the electronic equivalent of a microscope.. it lets you see what's happening immediately, and can clue you in to tiny details that a digital scope can't resolve. It's the same as being able to see a moving signal with an 18th-century galvanometer better than with a late 20th century pulse counting meter.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.