in this video I showed step by step how I assembled a divider and preamplifier of an audio signal. the design is easy to assemble and use. The device amplifies the signal and divides it into 5 outputs, while not distorting the signal, and is completely linear, and it is also equipped with a bluetooth module.
preamplifier
https://sl.aliexpress.ru/p?key=4ei8ZjV
legs for the case
https://sl.aliexpress.ru/p?key=g0i8ZG3
aluminum case
https://sl.aliexpress.ru/p?key=M9i8ZY7
bluetooth module
https://sl.aliexpress.ru/p?key=hmi8ZR9
microcircuit NE5532
https://sl.aliexpress.ru/p?key=Mji8Zsi