it's High Quality Design,very simple design and No preamplifier required
Circuit diagram:
Components
ResistorP1..........22K Log.Potentiometer (Dual-gang for stereo)
P2..........100K Log.Potentiometer (Dual-gang for stereo)
R1..........820R 1/4W Resistor
R2,R4,R8..........4K7 1/4W Resistors
R3..........500R 1/2W Trimmer Cermet
R5..........82K 1/4W Resistor
R6,R7..........47K 1/4W Resistors
R9..........10R 1/2W Resistor
R10..........R22 4W Resistor (wirewound)
Capacitor :
C1,C8..........470nF 63V Polyester Capacitor
C2,C5..........100µF 25V Electrolytic Capacitors
C3,C4..........470µF 25V Electrolytic Capacitors
C6..........47pF 63V Ceramic or Polystyrene Capacitor
C7..........10nF 63V Polyester Capacitor
C9..........100nF 63V Polyester Capacitor
Diode :
D1..........1N4148 75V 150mA Diode
Integrated Circuits :
IC1..........NE5532 Low noise Dual Op-amp
Transistors :
Q1..........BC547B 45V 100mA NPN Transistor
Q2..........BC557B 45V 100mA PNP Transistor
Q3..........TIP42A 60V 6A PNP Transistor
Q4..........TIP41A 60V 6A NPN Transistor
J1..........RCA audio input socket
Power supply Components :
R11..........1K5 1/4W Resistor
C10,C11..........4700µF 25V Electrolytic Capacitors
D2..........100V 4A Diode bridge
D3.........5mm. Red LED
T1..........220V Primary, 12 + 12V Secondary 24-30VA Mains transformer
PL1..........Male Mains plug
SW1..........SPST Mains switch
Description :
This particular design is founded on the 18 Watt Audio Amplifier, as well as was developed primarily to satisfy the actual requests associated with correspondents not able to locate the particular TLE2141C nick. It utilizes the common NE5532 Double IC however obviously, the power outcome will be made up in the nine. 5 -- 11. 5W range, since the supply bed rails cannot surpass ±18V.Because amplifiers of the kind are often used to generate small loudspeaker cabinets, typically the bass rate of recurrence range is quite sacrificed. Consequently a bass-boost control had been inserted within the feedback cycle of the amp, in order to conquer this problem without having quality deficits. The largemouth bass lift competition can achieve a maximum of +16. 4dB snabel-a 50Hz. Regardless, even when often the bass manage is aimed fully counterclockwise, the amp frequency reaction shows a mild raising contour: +0. 8dB @ 400Hz, +4. 7dB @ 100Hz and +6dB @ 50Hz (referred in order to 1KHz).
Additional Info :
- Can be straight connected to COMPACT DISC players, poste and audio recorders.
- Schematic displays left station only, however C3, C4, IC1 and also the power supply are typical to each channels.
- Figures in parentheses show IC1 right route pin cable connections.
- A record type with regard to P2 will make sure a more thready regulation of bass-boost.
Do not surpass 18 & 18V provide. - Q3 as well as Q4 should be mounted on heatsink.
- D1 has to be in energy contact with Q1.
- Quiescent present (best calculated with an Avo-meter in collection with Q3 Emitter) is not really critical.
- Arranged the volume manage to the minimal and R3 to the minimum opposition.
- Power-on the actual circuit and also adjust R3 to read a preexisting drawing of approximately 20 in order to 25mA.
- Wait around about a quarter-hour, watch when the current is actually varying along with readjust if required.
- A correct grounding is very important to get rid of hum in addition to ground streets. Connect to exactly the same point the floor sides associated with J1, P1, C2, C3 &C4. Link C9 towards the output floor.
- Then link separately the particular input plus output reasons to the power ground.
