The 3-stage amplifier circuit with LM380N, TDA7052 and LM386 amplifier integrations, which are often used in low-power audio applications .. The prepared PCB schematic looks the same for all the integrators, only the integrators have changed the layout of some elements accordingly.
1W Amplifier 2.5W Amplifier Circuits have standard power indicator, 6.3mm jack input and output potentiometer, and a noise reduction potentiometer. LM386: 5V … 12V TDA7052: 5V … 12V LM380N: 9V … 20V DC working voltage.
For example, the LM380N can work with 20v. To achieve high sound quality, 18v can be achieved by connecting two 9v batteries instead of a 9v battery. In order to increase the battery voltage, the battery is parallel (the batteries will be the same) and can also be used in adapters of the appropriate voltage instead of batteries