Hello, I just wanted to tell you that you are doing really interesting things when it comes to electronics. I have checked out your channel, your video list and everything, and some of the videos are really interesting like the "FM transmitter using a tunnel diode". They remember me of a book I have that is 2" thick, filled with schematics about transmitters and various projects (an amazing book to grow up... when interested in electronics). You do indeed have good knowledge about stuff. Your 27MHz transmitter with 5W output and low level modulation - that requires the final amp to be linear - is quite impressive. A few projects you could do, and... with your knowledge sure would give good results - Tv transmitter for analouge TV - FM receiver using pulse counting detector or slope detection - AM / Mediumwave transmitter - Improved version of your LED Tv transmitter. I´ve also played around with these, but I was using a (nearly) 14MHz carrier, which I´d transmitt via a laser, receive it with a photo diode, and mix it up to the VHF Frequency band. I don´t have a video of that really - but it works. Anyhow, I just wanted to give you a motivating speech here. I know myself how hard it is to get subscribers, comments and "over all popularity" here... especially these days. People who are good in making a show, show themselfs on camera easy get 50grand (up to 1M) subscribers, using electronic topics... but ppl like us "where the movie star is the electronics itself" struggle for subscribers. You are really doing an amazing and great work on your channel. Many interesting videos there. I just wanted to let you know that.

I need it to serve as a preamplifier. other classic BT modules barely push the headphones, and when I start the woofer of mobile phones it is weak. The BT module with this chip is too strong for the woofer input... how to adjust IC AB to lower output power?

Would that audio amplifier IC work at +5 volts?