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Category: Inside Circuits Views: 2991 Rank: 10 A very useful audio amp in an 8-pin DIL package. The IC features a very low minimum working supply voltage of 3V, low quiescent current, good ripple rejection, no crossover distortion and low power dissipation.  Maximum supply voltages is 16 Volts into 16 Ohms speaker, 12Volts into 8 Ohms and 9Volts into 4 Ohms. Datasheet file1: Click here to download TBA820.pdf datasheet.
Related circuits The circuit requires only one dual-ganged potentiometer to tune over a wide range; if necessary over the entire audio range in one sweep. The principle used is that of the Wien bridge, fed from anti-phase inputs. The output should be buffered as shown with a FET input op amp, particularly if a... Using a PA41 from Apex Microtechnology, this monolithic amplifier is capable of 350-V operation Press SI. The 100 µF electrolytic capacitor rapidly charges up at about 0 V. The transistor will be forward biased, and collector current will flow operating the relay. Release SI. The capacitor will begin to discharge via the 33 K resistor at the base of the transistor. When the voltage across... This circuit from Apex Microtcchnology can deliver 180 V p-p @ 90 kHz into a 4- load. Reprinted with permission from Radio-Electronics Magazine, February 1989. Copyright Gernsback Publications, Inc. 1989. Antennas that are much shorter than 1/. wavelength present a very small and highly relative impedance that is dependent on the received frequency. It is difficult to match... You can build a composite amplifier featuring high gain, wide bandwidth, and good dc accuracy by cascading the sections of a dual video amplifier and adding two appropriate phase-compen-sation components. With this unique logic-power-converter design (see the figure), a switchable 3.6 or 5 V at 200 inA can be attained by using four AA cells. The supply incorporates a MOSFET switch that can switch to a lithium backup battery, providing a 3.4-V output when the main battery is dead or removed. The... The circuit warns car drivers when the air temperature close to the ground approaches 0°C, thereby indicating possible formation of ice on the road surface. Op amp A1 is wired as a voltage level sensor. Op amp A2 is wired as an astable multivibrator which, by means of current buffer Trl, flashes... 2.Sound detector circuit with LM324 quad op amp IC
What is an op amp? Operational Amplifier tutorial & super spy microphone circ...
Comments
RiÄÂÂardas wrote on Feb 28, 2010
I have finished this amp and I found that it's perfect to supply from batteries, but if it is supplied from transformer it has pretty much noises. And also it is really god for headphones.
P.S. Sorry for broken English.
mixsfmradio.blogspot.com wrote on May 6, 2010
it's a simple ampli... i like this
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