DIY monoral transistor Amplifier

DIY monoral transistor Amplifier

I try to make transistor amplifier. It is designed at 7 transistors, 1 operational amplifier and push-pull circuit. [1]
Specification:
(1)gain 20 dB
(2)over 10 [W] output power at 8 ohm speaker
(3)DC +-15V power supply

upper:Monoral transistor amplifier. (R Ch)
under:Monoral transistor amplifier. (L Ch)

System Compornents.(Stand by)

System Compornents.(Power on)

Drilling into the lunch box.(Front)

Drilling into the lunch box.(Rear)

Drilling into the lunch box.(Bottom)

Drilling into the lunch box.(Bottom)

Drilling into the lunch box.(Partitions)

Attaching an aluminum plate to the partition.

Attaching the power supply board to the partition.

Bias adjustment of the main amplifier unit.

Attaching the power supply unit to the lunch box.

main amplifier unit.(top view)

main amplifier unit.(bottom view)

Attaching the main amplifier unit to the lunch box.

Connect to I/O terminals from main amplifier unit and then Connect to power unit.

参考資料:(Reference materials)
[1] 鈴木雅臣（1991）『定本トランジスタ回路の設計』CQ出版, p122

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