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Home Resume Projects - Realtime Analyzing Equalizer - Harmonic Distortion Reduction Feedback - Adaptive Filtering - Chat Program with Encryption - DIY Speakers - Amplifier - Preamplifier - Wireless Access Point - Wireless Antennas Contact |
Preamplifier
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 would include 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 built 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. Below are pictures, diagrams, and PCB board layouts. Basic schematic of the preamp Preamplifier PCB This
picture is of the preamplifier unit as it looks when designed in
ExpressPCB.
Power and volume control circuit
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.
8th order low pass filter 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.
Picture of the preamp assembled with the top off 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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Copyright © David Swiston Images released under GPL |