|Radio Shack Project Books by Forest M. Mims, III|
|A Field Strength Meter with a diode and transistor|
|You could buy boxes separately - they made good speaker boxes for a homemade intercom|
With project books, it was a natural that experimenters would buy lots of parts. And they did. I'm not sure the company got rich doing so but they carried parts for years before discovering selling cell phones was more important.
Once one graduated from projects, one would start modifying electronics from other sources.
|Power supply from a clock repurposed for projects|
|Repurposing an old radio as an amplifier case|
|Probing an old radio finds the output amplifier|
|Decision maker with neon bulbs|
Finally I decide to make more polished project cases. Here is a 555 function generator with changable frequency in a nice case.
|The range changes the capacitor while the tuning used a potentiometer in the 555 circuit|