I am a Boy Scout leadr and I have a scout wanting to build a graphic equalizer with a tone control circuit included.(am the electronics merit badge counslor)
I found several circuits using parts that I can't locate
Don't use an equalizer nor tone controls. Use better speakers instead.
If you turn up the high frequencies then you blow up the tweeters.
If you turn up the bass then you blow up the woofers.
If you turn up the mid-range frequencies then you blow up your hearing.