Fancy measurement gear is often expensive to buy, but some bits of kit are entirely DIY’able if you’re willing to put a little work into the project. [Christer Weinigel] needed to get some ...

It’s a preamp that does this job by attenuating the high frequency sounds and boosting the thumping bass. [miceuz] found a nice DIY RIAA preamp project and found a nice little op amp ...