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45 Watt Class B Amplifier

45 Watt Class B Amplifier Description 45W into 8 Ohm - 69W into 4 Ohm Easy to build - No setup required45 Watt Class B Amplifier Description


The main design targets for this amplifier were as follows:
Output power in the 40 - 70W rangeSimple circuitryEasy to locate, low cost componentsRugged performanceNo 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, then at the University of Keele, Staffordshire.
In this l…

Dual Audio Power Amplifier

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:

1W Per Channel Stereo Class-D Audio Power Amplifier

Features
1 watt per channel with 8-ohm loadMax. efficiency » 80% with 8-ohm load at 5 voltsFilterlessDigital gain controlBuild-in depop circuitryError protection for short circuit and over-temperatureMute (shutdown) current < 1µA typicalLow 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