Just an old hobbyist these days. I'm finishing up the written manual portion of a "breadboard helper" for playing with (learning) electronics. The current "help

Just an old hobbyist these days. I'm finishing up the written manual portion of a "breadboard helper" for playing with (learning) electronics. The current "helper" I am finishing up gives you instructions (and an explanation) for wiring up over a dozen transistor logic circuits with the aid of a small PCB + breadboard [1]. Inspired by Forrest Mims III, Don Lancaster and the "75 in 1" style electronic project kits my mom got for me for Christmas when I was a kid. I hope to sell them and then probably never recoup my investment. [1] https://imgur.com/8pkHiSm https://imgur.com/8pkHiSm (I'll leave it as an exercise for someone clever to figure out what circuit is being depicted in the photo.)