8 channel mainboard for modular audio mixer

I working on the PDF doc of the modular audio mixer project, but the PCB design is ready to try. This project is same as like the preamplifier project, but the preamplifiers connecting with 12 pins connectors to the mainboard of mixer circuit. First time, I made 4 channel mainboard only, but now I designed new PCB board for 8 channel audio mixer. This new mainboard is bigger, the width is 25cm. This is maximum size what I can finis with my homemade PCB creation method. In the future I will done new PCB design with 4 channel PCB with connectors to 8, 12 or 16 channel mixers.

The 8 channel mainboard:


The 8 connector on the board is for preamplifiers. The last 2 is one for master potentiometers, the another one is for 2 stereo line outputs.

PCB sales of this project Module name Size (mm) Area (cm2) PDF SCH PCB image Tested Price (US$) Des. Sim.1 Full2 Sim.1 Full2 Man3 Power filter module 17x25 4 Yes Yes Yes - - No 3 11 Ask 4 channel mixer mainboard 149x84 125 Yes Yes Yes - - No 19 28 Ask 8 channel mixer mainboard 240x80 192 Yes Yes Yes - - No 27 36 Ask I/O board 37x60 22 Yes Yes Yes - - No 5 12 Ask 2 Potmeter board 31x62 19 Yes Yes Yes - - No 5 12 Ask Microphone preamp module V2 67x103 69 Yes Yes Yes Yes - No 11 19 Ask Microphone preamp module V3 67x103 69 Yes Yes Yes - - No 11 19 Ask 1 dual opamp preamp module 61x103 63 Yes Yes Yes - - No 10 18 Ask 2 single opamp preamp module 64x103 66 Yes Yes Yes Yes - No 11 19 Ask HQ 2 single opamp module 67x103 69 Yes Yes Yes - - No 11 19 Ask jFET guitar preamp module 65x102 66 Yes Yes Yes - - No 11 19 Ask Switch module 18x34 6 Yes Yes Yes Yes - No 3 11 Ask Simple Power supply 121x57 69 Yes Yes Yes Yes - No 11 20 Ask Power supply with 48V phantom 168x89 150 Yes Yes Yes - - No 22 32 Ask How to order? Please read the rules carefully!