CIRCUIT DIAGRAM | SKEMA RANGKAIAN

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SIMPLE AUDIO PRE-AMPLIFIER CIRCUIT SCHEMATIC DIAGRAM

This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that’s very sensitive to sound.

CIRCUIT 24W AUDIO AMPLIFIER SCHEMATIC DIAGRAM

R23 is a trimmer and must be set to maximum resistance (10kOhm) when powering up. Then the resistance of R23 must be decreased until the the quiescent current is achieved. If the amplifier is mounted on a big enough heatsink ( 0.6K/W at most) then the amplifier is very safe from thermal runaway. Intelligence must be used when choosing power and voltage ratings of resistors and capacitors.

CIRCUIT 18W AUDIO AMPLIFIER SCHEMATIC DIAGRAM

This is Electronic Audio Amplifier Circuit Diagram. The sound produced imitates the rise and fall of an American police siren.

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 = 100?F 3V Tantalum bead Capacitors
C3,C4 = 470?F 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

CIRCUIT 4W AUDIO AMPLIFIER SCHEMATIC DIAGRAM

This 4W Audio Amplifier circuit is powered by 2 pieces of transistor TIP41. The circuit is very simple and incorporates darlington output transistors that will provide more than enough output current than is needed to drive a 3-ohm speaker.

CIRCUIT 800W AUDIO AMPLIFIER WITH MOSFET SCHEMATIC DIAGRAM

This amplifier can be used for practically any application that requires high power, low noise, distortion and excellent sound. Examples would be Sub-woofer amp, FOH stage amplifier, One channel of a very high-powered surround sound amplifier etc.

200 WATT HIGH QUALITY AUDIO AMPLIFIER SCHEMATIC DIAGRAM

high power audio amplifier will give you top class quality for loudspeaker 4 – 8 ohm. Frequency range 20-20000Hz, Voltage 24-36V with current max 5A. You need heatsink to keep the transistor from overheating.

25W HIFI AUDIO AMPLIFIER WITH MOSFET SCHEMATIC DIAGRAM

Notes:

Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need.

Q6 & Q7 must have a small U-shaped heatsink.

Q8 & Q9 must be mounted on heatsink.

Adjust R11 to set quiescent current at 100mA (best measured with an Avo-meter in series with Q8 Drain) with no input signal.

A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of R1, R4, R9, C3 to C8. Connect C11 at output ground. Then connect separately the input and output grounds at power supply ground.

CIRCUIT 20 WATT AUDIO AMPLIFIER WITH LM1875 SCHEMATIC DIAGRAM

This circuit is simple and very easy to built. For stereo channel, you need to build 2 same circuit which will amplify each channel (right and left channel).

CIRCUIT 2 WATT MINI AUDIO AMPLIFIER SCHEMATIC DIAGRAM

The circuit was deliberately designed using no ICs and in a rather old-fashioned manner in order to obtain good harmonic distortion behaviour and to avoid hard to find components. The amplifier(s) can be conveniently supplied by a 12V wall plug-in transformer. Closing SW1 a bass-boost is provided but, at the same time, volume control must be increased to compensate for power loss at higher frequencies.

In use, R9 should be carefully adjusted to provide minimal audible signal cross-over distortion consistent with minimal measured quiescent current consumption; a good compromise is to set the quiescent current at about 10-15 mA.