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Message: <blockquote data-quote="Elliot Woodman" data-source="post: 8924697" data-attributes="member: 694767">Hi, I am currently trying to upgrade the stock sound in my 1999 Volvo v70. However since I like the look of the factory Head unit, and would rather keep things looking stock as much as possible, I have decided to design and build my own car pre amp which will be nice and small so it can be mounted behind the original unit, and be sent to an external amp in the boot. I am sure that it would be be much more efficient to just buy parts, but having a fair amount of electrical design experience, I am going to enjoy designing a circuit myself, even though I am well aware that it wont be anywhere near as good as off the shelf parts. However I am not really sure what voltage my pre amp needs to output to pair well with a power amplifier, do I want as much voltage output as possible using the 14v available, giving me an output swing of around 12v peak to peak, or will the power amplifier also have some gain? I have started designing a switching circuit that will allow for the pre amp to be triggered via the ACC feed from the ignition, and have done a sort of passive input stage, High Z, and with a high pass and low pass filter. however am not sure where to proceed, I will want some eq control even if its just treble and bass. and was planning on using NE5532 op amps for this and the voltage gain. hoping that they will be enough to provide an input to the power amp? possibly having a small class AB output stage if The op amps are being pushed too hard? does this sound suitable? I have attached my current progress. I know this could be sorted in a couple hours if i just buy one, but again I am enjoying the process.</blockquote>

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