The A9913 is an amplifier made by CONTINENTAL produced in the 70s which produces 100 Watts of audio power at a symmetrical supply 40 DC Volt for load of 4 Ohm.
SCHEMATIC DIAGRAM
This is a editing schematic diagram of CONTINENTAL A9913 by yohanindrawijaya:
By the schematic above, we can summarize that this amp consists of several blocks:
- Differential Amplifier, using T101 and T103.
- Voltage Amplifier Stage, transistors is T105 and T109.
- Servo Driver, transistor T107.
- Over Current Protection, with transistor T111 and T113
- Driver amplifier and Power Amplifier by a pair of Darlington’s Transistor T115 dan T117 with number BDX85C and BDX86C.
NOTE
BDX85C and BDX86C are Darlington’s type transistors which can deliver 100 Watts of audio ( DATASHEETS ).
