preamp circuit 3

Posted on Feb 6, 2014

During my Digital Projects Lab, the professor recommended I find a way to include more circuit level work into my project. To fulfill this, I decided to build a nice preamplifier which wouldinclude an IR remote control to replace the one I had built previous. The previous preamp I had made worked well but it was not aesthetics pleasing and was bui

preamp circuit 3
Click here to download the full size of the above Circuit.

lt on breadboard rather than a PCB board. The entire preamplifier circuitry was designed from the ground up by myself. The PCB boards were also created by myself using a laser printer and Toner Transfer Paper. This picture shows the volume and power controlling circuit as it appears just before printing it out on the Press `n Peel Blue toner transfer paper. The yellow text provides labeling. The bottom 18 pin dip chip is the micro controller which decodes Sony IR signals, the 14 pin dip chip is an xor gate the two large rectangles are relays, and the smaller rectangles are voltage regulators. Yes, I understand the text is printed backwards. It was my first circuit board. This picture is of the 8th order LPF with an Fc of 90Hz. It shows what the PCB printout looks at the final stage. This is what is sent to the laser printer to be printed on the toner transfer paper. On the far left is the power supply. To the right of that is the power controlling circuitry on the bottom and the 8th order low pass filter on the top. Further right is the motor controlling circuit on the bottom and the preamplifier on the top.

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