There are many kits available to build that provide hours of fun.These can be purchased from various clubs and internet sites often at a reduced cost.Most come with a predrilled,etched circuit board of very good quality with all the parts and instructions.Usually the enclosure is not provided but may be available at extra cost. For the more adventurous there are schematics and one can scratch build,etching your own board,drilling out the holes and sourcing your own parts. Either way you get to hone your soldering skills and troubleshooting if things don't go as expected Building your own gear is challenging and very rewarding. https://www.youtube.com/watch?v=IJck_2VOqjA