Inverting Amplifier Uses Two Class AB Amplification Isolated Cells

Inverting Amplifier Uses Two Class AB Amplification Isolated Cells
Transistors are used often as the three lead-amplifying devices, in which the voltage input and output signals are measured from the total output. Thus, the input and output tied to the voltage on this pin. On the other hand, the four pin power allows you to unleash the input and output circuits. Using optical isolation, you can create a four-pin power class AB. Since the magnitude of the output voltage optocoupler limits its use, you can use discrete transistors

Class D Amplifier for ATtiny15L

Class D Amplifier for ATtiny15L
Recently, the widespread use of amplifiers have high efficiency - 90% or more. The sound signal is converted into a PWM (pulse width modulated), which explains their high efficiency, since the output stage while working in a key mode. Modern designs of such amplifiers - a monolithic chip, integrate processor and powerful output stages. Experiment with them, for example, to change the PWM conversion algorithm is difficult. (more…)

Subwoofer Amplifier for Computer

Subwoofer Amplifier for Computer
An integral part of modern multimedia computer is the presence of two active audio speakers (mounted on a monitor or set next to it). Due to a number of physical limitations of the two small computer speakers can not achieve a good reproduction of the full range of sound frequencies. Especially collapses and distorted bass. Therefore, to obtain high-quality background music is usually used yet a third column - the subwoofer. (more…)

Microphone Amplifier based K548UN1

Microphone Amplifier based K548UN1
The operating principle is as follows: Resistors R1, R3 is used to adjust the gain, which equals 25. To increase the gain by 75 to build a resistance of 68 ohms. It is not recommended to install too high gain, because it may affect the sound quality, although this depends on the microphone. Capacitors C5 and C6 are used for suppression of feeding. (more…)

Dual Channel Headphone Amplifier

Dual Channel Headphone Amplifier
Here is a the circuit dual-channel headphone amplifier. The circuit is built with ic DA1 - KR1054UN1, KF1054UN1, AN7050, TDA7050T (SO8 all), TDA7050 (DIP8), which is more expensive than the previous the circuit single-channel headphone amplifier. All devices operate at supply voltage range 1.6-6V. Current, as well as in the single-channel headphone amplifier was not great. THD - 0.1%. Frequency 20-20000Hz. Limiting long-term power output at 32 ohms. (more…)