Hi, Im a Mechanical Engineer and I really love the field of mechatronics so I got myself a nice team and we're currently working on a project that requires me to redesign a PCB, I have the circuit schematics and the original PCB, but I have little to no experience with actually designing them. (I know how to use SMT and PNP machines and I've done rework and reflow myself). I was looking over the schematics and there are 3 OP Amps per channel, among other things but it uses LM324D chips which have 4 OP Amps in them, so it leaves one unused OP Amp. The thing is this device needs 5 channels, so I was thinking is there a chip with 15 Op amps in it? if so how can I look for it? where do I find it? I tried googling that but I didnt find anything useful. I really want to reduce the size of the board so a 15 OP amp chip (or maybe 2 8 OP Amp chips?) will probably help me reduce this drastically. Or maybe is it possible to cut out one of the op amps? so it only requires 2 op amps per channel, and so I can do with a 10 channel chip? (still where do I find one?) Some more info: The circuit has 3 OP AMPS, one is a transimpedance amplifier, followed by a 2nd order butterworth filter fc= 39Hz and the third one is an inverting amplifier. -Thank you!