Let's Make Robots!

Breadboard limitations

Over the weekend I was trying to hookup some UHF TX/RX to do a howto on cheap wireless communication. I spent a few hours trying to figure out why it would work for a few seconds, and then stop working. After checking all the connections, all I could figure out was that if I jiggle a few wires, it would work again. From this I decided that it was a problem with the breadboard I was using. 

That reminded me that I had used a breadboard to check a Soundgin chip Frits had generously sent me. At the time I spent a few hours of testing, couldn't get it to work, so I thought was a blown or something. That UHF breadboard failure  led me to make a pcb for the soundgin, which now works perfectly. 

So, My question is, what are the limitations to breadboards?  The first with the uhf at 433Mh, and the second with the soundgin and external 10Mh crystal, I can understand that the frequencies might be getting screwed from the breadboard, but how do I know it's the breadboard and not my cicuit? And are there some types of circuits that you can't do with a breadboard?

Sorry for the ramblings, but I'll have a howto for the soundgin soon. 

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Wikipedia has a statement on the capacitance of the board relating to frequency use.

While the radio was sending RF energy at 433 Mhz, the actual circuit sending current through the board was operating at a lower frequency. What is more likely the problem, is possible mechanically worn contacts, ie:the metal clips inside had too large of wires / pins / whatever pushed in, and have deformed to a point where good contact is not being made with smaller wires. Sometimes even a wide pin in one row will open the clip for the whole row so good contact is not being made. Some boards contacts can easily deform, other spring back a bit better, but all eventually can become deformed.