Audio booster

Posted on Jun 19, 2012

The amplifier's gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components—primarily Cl and Rl. The values of the schematic diagram provide a response of ±3.0 dB from about 120 Hz to better than 20,000 Hz. Actually, the frequency response is ruler flat from about 170 Hz to well over 20,000 Hz; it's the low end that deviates from a flat frequency response. The low end's roll-off is primarily a function of capacitor Cl (since Rl's resistive value is fixed). If Cl's value is changed to 0.1 pF, the low end's corner frequency—the frequency at which the low-end roll-off starts—is reduced to about 70 Hz.

Audio booster
Click here to download the full size of the above Circuit.

If you need an even deeper low-end roll-off, change Cl to a 1.0 µ¥ capacitor; if it's an electrolytic type, make certain that it's installed into the circuit with the correct polarity, with the positive terminal connected to Ql's base terminal.

Leave Comment

characters left:

New Circuits



Popular Circuits

Telephone line interfacing
Digital Tachometer Circuitry
Positive And Negative Voltage Switching Supply
Receiver If Amplifier
Moisture Detector Circuit
LED Hat Display with Pong using an Arduino
Water Level Sensor with Arduino Ethernet
Control motor PWM schematic
Audio/Video to UHF TV Signal Converter (Modulator)
arduino scr
Mobile cell phone detector (sniffer) circuit diagram: engineering and diploma project
Ultrasound Pulser
PC joystick interface
mini logger circuit
Simple Short-Wave Transmitter
Transmitting Audio Streams in Automotive Applications Using the MAX9205/MAX9206 LVDS SerDes
Build a Miniature High-Rate Speed Control with Battery Eliminator Circuit (BEC)