Transistor 2X100W stereo and mono bass amp circuits by converting 12V battery voltage (between 11v…14.4v) SG3525 DC DC voltage amplifier circuit to around 2X30…35V. There is protection against short-circuiting in both circuits and short-circuiting of the transistors at the amplifier output and giving DC voltage.
The 120W subwoofer amplifier has an adjustable bass filter circuit between 80-180Hz. The dimensions of the toroidal core used at the power output of the SG3525 DC DC converter circuit are 31x19x13 mm, the winding on the 12v line is 2×5 turns (4x1mm wire), and the output winding is 4×14 turns (1x1mm wire).
The short circuit protection system is provided according to the voltage drop over the shunt resistors connected to the emitter of the transistor to which the + plus line is connected at the amplifier output. DC voltage sensing is detected over a 20k…47k resistor connected to the output. You can use this circuit with 4 transistors and PC817 opto couplers in different projects.
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