Ordering a typical printed circuit board with components placed on it is so cheap nowadays that this is a viable option for electeonic hobbyists nowadays (e.g. just ordered 50 pieces of audio output amplifiers at 3,49 € per piece (customs and shipping included), where 1.60 € would be the parts cost of the two chips on it.
Only thing you need for this is:
1. An idea and some knowledge about electronics
2. An EDA software where you design the schematic and the PCB (Horizon EDA, KiCAD, Eagle, ...). This software will give you the Gerber files needed to manufacture the PCBs and the BOM (Bill of Materials) and a Pick-and-Place file which is basically just a CSV telling the manufacturer which part goes where and in which orientation.
3. Using the BOM you find corresponding parts the manufacturer has and put create a CSV that matches their format requirements
4. You order (e.g. I ordered at jcbpcb)
The electronics knowledge is the hardest part.
Only thing you need for this is:
1. An idea and some knowledge about electronics
2. An EDA software where you design the schematic and the PCB (Horizon EDA, KiCAD, Eagle, ...). This software will give you the Gerber files needed to manufacture the PCBs and the BOM (Bill of Materials) and a Pick-and-Place file which is basically just a CSV telling the manufacturer which part goes where and in which orientation.
3. Using the BOM you find corresponding parts the manufacturer has and put create a CSV that matches their format requirements
4. You order (e.g. I ordered at jcbpcb)
The electronics knowledge is the hardest part.