Skip to main content

18W Audio Amplifier Circuits Diagram


This is the simple project of 18W Audio Amplifier Circuits Diagram
18W Audio Amplifier Circuits Diagram

Amplifier parts:

P1_____________22K  Log. Potentiometer (Dual-gang for stereo)
 
R1______________1K  1/4W Resistor
R2______________4K7 1/4W Resistor
R3____________100R  1/4W Resistor
R4______________4K7 1/4W Resistor
R5_____________82K  1/4W Resistor
R6_____________10R  1/2W Resistor
R7_______________R22  4W Resistor (wirewound)
R8______________1K  1/2W Trimmer Cermet (optional)
 
C1____________470nF  63V Polyester Capacitor
C2,C5_________100µF   3V Tantalum bead Capacitors
C3,C4_________470µF  25V Electrolytic Capacitors
C6____________100nF  63V Polyester Capacitor
 
D1___________1N4148  75V 150mA Diode
 
IC1________TLE2141C  Low noise, high voltage, high slew-rate Op-amp
 
Q1____________BC182  50V 100mA NPN Transistor
Q2____________BC212  50V 100mA PNP Transistor
Q3___________TIP42A  60V 6A    PNP Transistor
Q4___________TIP41A  60V 6A    NPN Transistor
 
J1______________RCA  audio input socket

Power supply parts:

R9______________2K2 1/4W Resistor
 
C7,C8________4700µF 25V Electrolytic Capacitors
 
D2_____________100V 4A Diode bridge
D3_____________5mm. Red LED
 
T1_____________220V Primary, 15 + 15V Secondary, 50VA Mains transformer
 
PL1____________Male Mains plug
 
SW1____________SPST Mains switch


Notes:

  • Can be directly connected to CD players, tuners and tape recorders.
  • Do not exceed 23 + 23V supply.
  • Q3 and Q4 must be mounted on heatsink.
  • D1 must be in thermal contact with Q1.
  • Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
  • Adjust R3 to read a current between 20 to 30 mA with no input signal.
  • To facilitate quiescent current setting add R8 (optional).
  • A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Connect C6 to the output ground.
  • Then connect separately the input and output grounds to the power supply ground. 
 Technical data:
Output power:
18 Watt RMS into 8 Ohm (1KHz sine wave)
Sensitivity:
150mV input for 18W output
Frequency response:
30Hz to 20KHz-1dB
Total harmonic distortion @ 1KHz:
0.1W 0.02% 1W 0.01% 5W 0.01% 10W0.03%
Total harmonic distortion @10KHz:
0.1W 0.04% 1W 0.05% 5W 0.06% 10W0.15%
Unconditionally stable on capacitive loads

Labels:

Comments

Post a Comment

Popular posts from this blog

Transceiver Homebrew QRP SSB 80M Band

Radio communication transceiver is a radio transmitter at the same time the plane doubles as a radio receiver used for communication purposes. It consists of the transmitter and the receiver are assembled in an integrated way. In mulamula generation, the transmitter or receiver or transmitter and receiver sections are assembled separately and is part of a stand sendirisendiri and can work well sendirisendiri Currently employed both parts are integrated in turn. Aircraft simple transmitter consists of an oscillator generating radio vibration and this vibration after vibration boarded with our voice, in a technique called dimodulir radio, then by the antenna is converted into radio waves and transmitted. As we know that the sound waves we can not reach long distances, although its power is quite large, while the radio waves with a relatively small force can reach a distance of thousands of kilometers. In order for our voice can reach a far distance, then our voice superimposed on radio w...
Post a Comment
Read more

NE566 Function Generator Circuit Diagram

The NE566 Function Generator is a Voltage-Controlled Oscillator of exceptional linearity with buf fered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The Oscillator CAN be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity.  FMAX = 1 MHz     WIDE 1000:1 Continuous Sweep Possible  NE566 Function Generator Circuit Diagram Pdf Datasheet  Sourced by : Circuitsstream
Post a Comment
Read more

TDA2030 complete tone control

At this time I present a series of amplifiers that use IC TDA2030, but this series is equipped with a tone control. Tone controls include Bass, Treebel, and Volume. Power amplifier and tone control has been put together in a single PCB. As well as its power supply circuit was also used as one with the power amp, and tone control. Making it easier in the installation and will look neat. Schematics Layout PCB PCB design This amplifier is a mono amplifier type, can be modif for guitar amplifiers. If not coupled amplifier (mic preamp) then you must deactivated potensio treble and bass, why? because if not using a mic preamp and still maintain potensio treble and bass sound input (input) from the guitar will not or the maximum discharge is not tight on the speakers. So you must deactivated a way to decide which directly connected capacitor with the tone control circuit, and capacitor were connected directly to potensio volume and input jack.
Post a Comment
Read more