Hi,
Last day I gave a life to a retired cassette player power amplifier. Removed the cassette player mechanism and added 3.5mm input to the audio power amplifier. Now it's compatible to modern players like cellphone.
Without attenuator, amplifier was overloaded because of high audio output of cellphone. With an attenuator resistor (15k and 3.3k) and a 10nF high frequency booster, audio output was awesome from the very old power amplifier.
During experiment I got two condition, see the attached diagram. First did not work (or did I make any mistake?) but 2nd did work. Is there any theory behind it? (The power audio amplifier has a general purposes transistor circuit as preamp at input.)
Last day I gave a life to a retired cassette player power amplifier. Removed the cassette player mechanism and added 3.5mm input to the audio power amplifier. Now it's compatible to modern players like cellphone.
Without attenuator, amplifier was overloaded because of high audio output of cellphone. With an attenuator resistor (15k and 3.3k) and a 10nF high frequency booster, audio output was awesome from the very old power amplifier.
During experiment I got two condition, see the attached diagram. First did not work (or did I make any mistake?) but 2nd did work. Is there any theory behind it? (The power audio amplifier has a general purposes transistor circuit as preamp at input.)
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