Internal circuit of TM2001A

TM2001A is an 18-pin single-in-line plastic package circuit. Its internal circuit principle is shown in Figure 2-1090. As can be seen from the figure, this circuit
is an OCL type bi-amplifier circuit. Its characteristic is that the emitter resistor of the output tube is connected outside (through 7 , 8 pins and 11, 12
pins), which not only improves the reliability of the circuit operation, but also allows the fork to be easily connected to the protection circuit through this resistor .