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

Digital code Lock with AT89C2051
Digital Gates
Low-noise broadband amplifier
Temperature controller
Temperature Controller With Defrost Cycle
Loudspeaker Protector Circuit
Single Differential Input Adapter for Digital Voltmeter
74HC240 produces and seeks all robot
Two way Simple Very Small Telephone Exchange
FT0 frequency synthesizer circuit
rain sensor alarm circuit
Electronic Tachometer
non inverting opamp butterworth filter
A Christmas lights circuit
Asia ultrasonic remote control circuit