Step 7Step 7
Another alternative would be to fit the head from a quadraphonic 8 Track player (arranged as 2 sets of 4 channels to give independent sound to 4 speakers). And you thought surround-sound was a new thing? An amplifier circuit with 4 channels could then feed some quad headphones. Yes these do exist and were made in 1970's with a front/rear speaker in each side of the headphones. There is an instructable somewhere on how to make some (for DVD surround-sound).
The cartridges are all available on ebay very cheap. They usually require cracking open and the mechanism sorting out. This is not too difficult after a short learning curve.
Have fun!
John
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