Amplifier Parts list:

This circuit is related to the 18 Watt Audio Amplifier, and was designed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It works with the widespread NE5532 Dual IC but, certainly, its capability output is going to be comprised around the 9.5 – 11.5W range, because the voltage supply rails can not exceed ?18V.

As amplifiers of this variety are usually applied to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. As a result a bass-boost manage was inserted within the feedback loop of the amplifier, so as to overcome this issue with out top quality losses. The bass lift curve can reach a maximum of +16.4dB @ 50Hz. In any case, even when the bass manage is rotated totally counterclockwise, the amplifier frequency response shows a gentle raising curve: +0.8dB @ 400Hz, +4.7dB @ 100Hz and +6dB @ 50Hz (referred to 1KHz).

Transistored 10W Audio Amplifier Circuit Notes:

• This circuit can be immediately connected to CD players, tuners and tape recorders.
• Schematic exhibits left channel only, but C3, C4, IC1 along with the power source are frequent to both channels.
• A log type for P2 will make certain a much more linear regulation of bass-boost.
• Numbers in parentheses show IC1 proper channel pin connections.
• The maximum power supply voltage is -18V / +18V.
• Q3 and Q4 should be mounted on heatsink.
• D1 has to be in thermal contact with Q1.
• Quiescent current (better measured with an multimeter in series with Q3 Emitter) will not be crucial.
• Power-on the circuit and adjust R3 to read a electric current drawing of about 20 to 25mA.
• Set the volume manage for the minimum and R3 to its minimum resistance.
• Wait about 15 minutes, watch if the electric current is varying and readjust if necessary.
• A right grounding is extremely necessary to eradicate hum and ground loops. Connect for the identical point the ground sides of J1, P1, C2, C3 &C4. Connect C9 towards the output ground. Then connect separately the input and output grounds to the power supply ground.

Power supply diagram:

Power Supply parts list:
R11 1K5
C10,C11 4700uF/25V
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

Transistored 10W Audio Amplifier circuit source: RedCircuits

This circuit can be operated with voltage range of 8V – 30V DC, with recommended supply is 24VDC. Mount the TDA1910 on a heatsink to prevent overheating and maintain the IC’s performance.

The TDA 1910 is a monolithic integrated circuit in MULTIWATT? package, intended for use in Hi-Fi audio power applications, as high quality TV sets.

The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

TDA 1910 Features:

• muting facility
• protection against chip over temperature
• very low noise
• high supply voltage rejection
• low “switch-on” noise.

Download TDA1910 datasheet, 10W audio amplifier, to know the IC characteristics from the following link:
[wpdm_file id=72]

Component parts:

Specifications:
D.C. Input: 8 ? 18V, 10 ? 20 VA min.
Power output:
> 10 W RMS, 2 ohm load, 16V DC supply.
> 6W RMS, 4 ohm load, 16V DC supply.
> 4W RMS, 4 ohm load, 12V DC supply.
THD: < 0.2% (1W, 4 ohm load)
Gain: 40 dB maximum.
S/N ratio :
> 80 dBA. (G = 20 dB)
> 60 dBA (G = 40 dB)
Frequency response: < 20 Hz to > 40 kHz (-3dB, 4 ohm load)
Input level:
< 100 mV for full output (G = 40 dB)
< 1V for full output(G = 20 dB)

Maximum output power will only be obtained with a power supply of greater than 1A at 16V DC, and using 2 ohm speakers (or 2 by 4 ohm speakers in parallel). However approximately 4W RMS can be obtained with a 12V DC, 1A supply into a 4 ohm load.

The power supply should be well filtered to reduce mains hum, the on board capacitors alone are not adequate for this purpose but are necessary to ensure stability. Extra filtering is unnecessary if operating from a battery. If two boards are used for stereo, you will need to double the size of the power supply.

Download the 6-10W Audio Amplifier with IC TDA2002 Circuit Manual:
[wpdm_file id=58]

Download TDA2002 Datasheet:
[wpdm_file id=59]

The kit of this amplifier circuit is available at kitrus.com