DIY Twin Single Power Amplifier

DIY Twin Single Power Amplifier (August 25, 2019)

Specification.
Single Audio amplifire IC: TEXAS INSTRUMENTS LM1875
Output power: 20W (at Vcc=+25V, Vee=-25V, 8 ohm) *1
Closed loop voltage gain: 26dB
Supply voltage: DC 18V *2

*1:note:This DIY Single amplifier system designed for single DC.
It can be update power gain used high voltage and high current power supply.
*2:translated into 100V AC to 18V DC with TOYOZUMI's trans and regulator of JRC's NJM 317.

Over view.(Circuit boards in AEON's Top value series lunch box)

Over view

Over view.(top cover removed)
Left side circuit board is delay system for speaker output on/off.
Right side circuit board is mono power amplifire system.

Rear view.
Imput terminal, Speaker terminal and DC terminal.

Connected each terminal to the cables and power on it.

Connetced power supply unit.

Completion system.

If you interested in the power supply, refer to 'DIY Power supply'.

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