Featured with muting facility, protection against chip over temperature, very low noise, high supply voltage rejection, and low “switch-on” noise, this amplifier circuit should be enough for your small audio system project. This amplifier is cheap, very simple and easy to build.

About TDA1910:
The TDA 1910 is a monolithic integrated circuit in MULTIWATT® package, intended for use in Hi-Fi audio power applications, as high quality TV sets. The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

Below is the circuit diagram of high power audio amplifier dual output at 100W max each output channel. This is a great output power with only using single chip.

Note:

• This circuit using splitted power supply, please see the IC datasheet for the recommended power supply voltage.
• Use heatsink on the chip to prevent over heating.

This is complete project for 20W audio amplifier based on single amplifier chip TDA2040. Schematic diagram and PCB layout design were provided here. This amplifier require dual polarity power supply. Heatsink is a must yo keep the IC from overheating.

Schematic diagram:

This is a high quality audio class AB amplifier in hi-fi applications. It has very low noise and distortion, wide bandwidth and good output current capability, enabling it to supply high power into both 4Ω and 8Ω loads. It has both short circuit and thermal protection, so is quite robust.

Component part list:

R1_____________ 150R
R2, R3, R5_____ 10K
R4_____________ 680R
R6_____________ 22K
IC1____________ TDA 7294
Heatsink

C1____________ 1u5F or 1u
C2____________ 2n7F
C3, C6________ 22uF 63V
C4, C5________ 10uF 63V
C7, C9________ 2200uF 50V
C8, C10_______ 100nF

This is an LED pulse effect circuit. The effect result of this circuit is that the LED goes from off state, lights up gradually, then dims gradually.

This operation mode is obtained by a triangular wave generator formed by two op-amps contained in a very cheap 8 pin DIL case IC. Q1 ensures current buffering, in order to obtain a better load drive. R4 and C1 are the timing components: using the values shown in the parts list, the total period is about 4 seconds.

R1,R2 _________4K7 ohm
R3    _________22K ohm
R4    _________2M2 ohm  (See Notes)
R5    _________10K ohm
R6    _________47R ohm  (See Notes)
C1    _________1µF/ 63V Polyester Capacitor
D1    _________5mm. LED (See Notes)
IC1   _________LM358  Low Power Dual Op-amp
Q1    _________BC337  NPN Transistor