You may not believe your eyes. There are just five parts only, so easy. If you are seeking the circuit amplifies small-sized. I recommend this circuit because tiny economize with the equipment is a little.
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WhatsApp Advertisement Portable devices like personal computers, MP3 players, sound recorders, telephones and audible sensors are frequently in need of additional stereo amplifier to produce sufficient sound. These audio amplifiers should work with batteries 4. This output power is enough for listening in a small room with several people. Stereo amplifier circuit and working Fig. Typical quiescent current of TDA is 4mA, which makes it appropriate for battery operations. Gain of each channel of the circuit is 39dB around Typical input resistance of TDA is kilo-ohm, and the IC is suitable for a lot of high-impedance signal sources.
The circuit has six switches S1 through S6. When S1 and S2 are open, input impedance of the circuit is more than kilo-ohm and the amplifier can be used with electrical guitars, high-impedance sensors and signal sources. When S3 and S4 are closed, input resistance is reduced and, at the same time, output noise is reduced.
The power supply is applied to the circuit through S6. If S5 is closed, the circuit works as a dual-channel mono amplifier. Left and right audio signals coming from connector CON1 are shorted through S5. If S5 is open, the circuit works as a stereo amplifier with two different input signals. Output power of TDA is typically 1. The power supply can be increased but the load should have higher resistance, of say, ohm. The left and right audio channels have separate volume controls, VR1 and VR2, respectively.
This avoids the usage of the balance-control potentiometer so that the two channels can also be used separately for the amplification of two mono signals.
Values of VR1 and VR2 should be minimum in order to reduce output noise. Value of C5 should be minimal for the circuit to operate from most USB interfaces. After assembling the circuit on the PCB, enclose it in a suitable enclosure. More interesting projects available here.
Circuit audio power amplifier btl tda7052
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