This TR3906 PNP small signal transistor is used in many solar engine designs.These ones are pulled from the stock we build our own kits from, so you can be assured they'll work!The NPN complement to this transistor is the TR3904.
2SA683 for low-frequency power amplification and driver amplification. Complementary to 2SC1383 and 2SC1384.Complementary pair with 2SC1383 and 2SC1384TO-92 package.