Power amplifier for Loudspeaker 6.5W 8R circuit

Posted on Feb 6, 2014

The amplifier of circuit, use negative current feedback. So, the load current depends mainly from the input signal and no so much from the impedance of loudspeaker. The inductor current of loudspeaker develop above in the R7 a voltage. This voltage is drive to the inverting input of IC1, creating thus negative feedback. Total voltage gain of circu

Power amplifier for Loudspeaker 6.5W 8R circuit
Click here to download the full size of the above Circuit.

it, it depend from the reason of impedance of loudspeaker H1 [ Zo ], to the price of R7. In the circuit the gain is (Zo+R7)/R7 that is to say (8+0. 5)/0. 5=17. The connection output of IC1 in the ground, is extraordinary, but in this way, the current of base of transistors Q1, Q2 is provided by the lines of supply and no by the IC1. The calm current of is 50 until 100mA, for operation in Class A and is determined by R2, R3, R5, R6. Transistors Q1-Q2, should be matching, so that are not created big current and voltage of deviation. May it will are change the resistors R2, R3, so that we achieve symmetry of bias. With complete drive, the current of emitter the Q1-Q2 is roughly 500mA. The THD is 0. 01% for output power, 6. 5W in 8R and voltage supply ± 18V. Elektor`87

Leave Comment

characters left:

New Circuits



Popular Circuits

Keypad Combination Lock circuit
Charger Extends Lead-Acid Battery Life
Energy Saver Relay Coil circuit and explanation
Linear Amp Project HF VHF UHF Amplifier
high frequency waveform generator
CM2 Practical
remote tester
Power Amplifier Mini 2W+2W by TBA820M
UHF Antenna Amplifier Circuit
Simple Electrification Unit
iphone battery pack
Exposure timer circuit D flip-flops