@MLE_online I found the article online, the transistors mentioned can have 2N2222 or 2N3904 subbed in for them, they're fairly low-gain germaniums from back in the day. The coils and ultrasonic transducer is going to the trickier bits, I think. It's some sort of tuned circuit, but unless one found a cross-reference for the coils, it'd be hard to know what the inductance would be. Really neat find though!
@Stormgren This was always the problem when i tried to do electronics projects out of books or magazines when I was a kid.
I could find some of the exact parts, but never all of the exact parts, and I didn't know enough about electronics to know if a similar-seeming part would work or not. So, none of my projects ever worked.
@MLE_online@Stormgren Yep I remember trying to build an FM or AM radio receiver, I think, out of a World Book encyclopedia article.
It called for a capacitor with units measured in "mfd" (is that microfarads or millifarads?) and a "loopstick" whatever that was.
That was the part that made me give up on the project, I had no idea what it was or where to find it. It seemed like some kind of inductor or antenna but that was about all I could figure out.
And yes I think it called for specific BJTs that I didn't have a local source for either. This was early 2000s, before I learned about digikey etc (if they even existed).
@azonenberg@Stormgren I needed parts to build some damn thing that would turn light signals into sound and radio shack did not have the parts even though it was from one of the radio shack project books. So, i got my mom to drive me over the hill to an old school electronic components shop. The old man was kind of mean and said he didn't have the parts. But he gave me substitutes that he said were close enough. It never worked.
Shortly before I moved out of my parents' place I discovered Wayne Electronics, a local non chain store which had a much better selection of 74xx and CD4000 etc parts plus passives. This was right around the time RadioShack started to go downhill and focus more on consumer stuff and have few if any actual passives or ICs available for purchase.
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