DC Mixer and Amplifier

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TDA2030 : 15W OTL Audio Amplifier Circuit

This is the circuit diagram of 15W OTL audio amplifier based single power IC TDA2030.

TDA2030 : 15W OTL Audio Amplifier Circuit diagram

The TDA2030 is a popular power chip for low power amplifier circuit. The circuit will deliver about 15W audio power when use 8ohm loudspeakers. For maximum power output, you need 24VDC power supply with 1A current, for single/mono channel. Use power supply with 2A minimum output current for stereo channel. Do not forget to mount a heatsink on the IC.

15W OTL Audio Amplifier PCB design

TDA2030 : 15W OTL Audio Amplifier Circuit PCB design

TDA2030 : 15W OTL Audio Amplifier Circuit,

45W Power Audio Amplifier Circuit with HEXFET

45W Power Audio Amplifier Circuit with HEXFET

This is 45W power audio amplifier circuit which built using HEXFET IRF9540 and IRF540. This is a ideal solution for the make a good, low cost power amplifier circuit.

Components List:

R1 = 47K ohm C1-2-6-7 = 100nF 100V MKT Q5-6 = IRF9540
R2-12 = 1K ohm C3-4 = 22uF 25V Q7-8 = IRF540
R3-4 = 3.3K ohm C5 = 220pF styroflex TR1 = 5K ohm trimmer multiturn
R5 = 1.2K ohm C8-9 = 4700uF 63V TR2 = 1K ohm trimmer multiturn
R6 = [1.2K ohm] 820 ohm *See text C10 = 1uF 100V MKT F1-2 = fuse 3A
R7 = 270 ohm D1-2 = 15V 0.5W zener J1 = 2pin connector 2.54mm step
R8 = 220 ohm IC1 = LF411orAD711or LF351 J2 = 5pin connector 5mm step
R9 = 27K ohm Q1 = BC550C
R10-11 = 22K ohm Q2 = BC560C All Resistors 1/4W 1% metal film
R13-14-15-16 = 150 ohm Q3-4 = BC547B

The preamplifier and the driver support in a operational amplifier [IC1]. The voltage fall in resistors R5 and TR2/R6, drive the output FET's gates and is proportional with the input signal level. Transistors Q1-2 function as voltage stabilizers in the supply lines, but ensure also the essential voltage fall, because the IC1 it should not they are supplied with voltage bigger ± 18V. The consumption of all types that can be used in the place of IC1, are 2 mA, this it means voltage fall in terminal the R5 and TR2/R6 equal with the 2.4 until 2.6Volts. The current regulation it become from transistors Q3-4 in Wilson connection and the current adjustment of bias it becomes from the multiturn TR1 trimmer.

45W Power Audio Amplifier Circuit with HEXFET,

50W Audio Amplifier Circuit

50W Audio Amplifier Circuit

Here the 50W audio amplifier circuit diagram. The amplifier is based ICL8063. This a good amplifier circuit which is easy enough to built.. This circuit can be connected by radio, TV, stereo or other devices.

The circuit is also featured with inputs for the record player, guitar, microphone, and others. If you add low pass filter at the input, it will work like a mini-subwoofer. Circuit scheme presented will guide you in 50W amplifier construction, good luck.

The power supply is splitted type, already added on above circuit diagram.

Components List:

R1 = 200R 1/4W
R2 =200K 1/4W
R3 = 30K 1/4W
R4 = 1K 1/4W
R5 = 5K 1/4W
R6, R9 = 1M 5% 1/2W
R7, R8 = 0,4 ohm 5W
R10 = 10K Pot
R11, R12 = 51K 1/4W
R13 = 47K 1/4W
C4, C6, C5, C7, C8 = 1nF
C9 = 50pF
C10 = 0,3uF
C11, C12 = 10000uF/50V
U1, U2 = IC 741 Op Amp
U3 = ICL8063
Q1 = 2N3055 NPN Power Transistor
Q2 = 2N3791 PNP Power Transistor
D = 250V 6A Bridge Rectifier
T = 50V Center Tapped 5A Tranformer
C1 = 100uF/35V
F1 = 2A Fuse
C2 = 11nF
SPEAKER = 8 ohm 50W
C3 = 3750pF
Heatsinks For Q1 and Q2
50W Audio Amplifier Circuit,