AmplifierCircuits

45 Watt Class B Amplifier Description 4 5W into 8 Ohm - 69W into 4 Ohm Easy to build - No setup required 45 Watt Class B Amplifier 45 Watt Class B Amplifier Description The main design targets for this amplifier were as follows: Output power in the 40 - 70W range Simple circuitry Easy to locate, low cost components Rugged performance No setup These goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the output current. At higher output currents, the power transistors conduct, and the contribution of the op-amp is limited to approximately 0.7/R11. The quiescent current of the op-amp biases the external transistors, and hence greatly reduces the range of crossover. The idea sprang up from a letter published on Wireless World, December 1982, page 65 written by N. M. Allinson, th...

General Description: The TA8211AH is dual audio power amplifier for consumer  applications.   This IC provides an output power of 6 watts per channel   (at VCC = 20 V, f = 1 kHz, THD = 10%, RL = 8 Ω).  It is suitable for power amplifier of TV and home stereo.  Features: High output power: Pout = 6 W/channel (Typ.)   (VCC = 20 V, RL = 8 Ω, f = 1 kHz, THD = 10%)  Low noise: Vno = 0.14 mVrms (Typ.)   (VCC = 28 V, RL = 8 Ω, GV = 34dB, Rg = 10 kΩ,   BW = 20 Hz~20 kHz)  Very few external parts  Built in thermal shut down protector circuit  Operating supply voltage range: VCC (opr) = 10~30 V (Ta = 25°C)  Circuit Diagram: Circuit diagram for Dual Audio Power Amplifier 

Features 1 watt per channel with 8-ohm load Max. efficiency » 80% with 8-ohm load at 5 volts Filterless Digital gain control Build-in depop circuitry Error protection for short circuit and over-temperature Mute (shutdown) current < 1µA typical Low operating current (4mA at 5 volts without load) TSSOP 24L package available  General Description The AP130 is an oversampling class-D power amplifier for  stereo audio applications. It provides high power-efficiency for filterless 8-ohm load. Build-in depop, mute and gain control features simplify the applications. BTL (Bridge-Tied-Load) configuration delivers up to 1 watt into 8-ohm load per channel at 5-V supply voltage. It allows direct coupling of the power signal. Reliability is improved through over-temperature and short circuit protections. The class-D power amplifier enables high efficiency applications for portable devices. Circuit Diagram 1W Per Channel Stereo Class-D Audio Power Amplifier ...