At your risk. Always protect your hearing from high acoustic levels or listening experiments.
It is described in earlier posts.
This is just a description on what is currently seen on the experimental breadboard. One 2N3053 GE/RCA H 8940 bipolar transistor is used for each channel. No heat sink is used as the operating voltage is low. At your risk.
The input 1/4in female stereo connector is connected without capacitor to a 50KΩ B (logarithmic?) stereo miniature potentiometer. At your risk. The wipers are connected to the 1/4in female connector.
The other side of each pot section to each transistor base.
Each base is current biased by a 100KΩ trimmer from collector to base. Measured values are 51.5KΩ for the upper transistor and 53KΩ for the lower. The values where screwdriver adjusted by ear brain for best sound while a Portable CD player was connected. At your risk. Take all nessesary war protection precautions.
The AA battery 1.5V plus terminal passes through output female stereo connector ie through headphone voice coils and then connected to each transistor collector. Always use a suitable fuse for safety. So DC or limit to 0Hz coupling. See hearing aid at recent posts and other schematics. The voice coil is the load resistor itself.
The headphone should not be worn while the amp is switch on or the headphones jack inserted or removed.
There is a step function or click sound containing infinite frequencies. The shorter the duration of a signal the higher the bandwidth, Heisenberg uncertainty principle in sound [Waves, Berkeley].
Protect your ears.
Reference:
Waves - Berkeley Physics Cource - Volume 3 - Frank S. Crawford, Jr. - McGraw-Hill Publishing Company
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