Using only active component (the right and left channel) Philips TDA1521 monolithic integrated circuit, which contains a double line-end audio amplifier completely independent, each capable of providing from 10 to 12 W to the load 8 ohm or 15 W into 4 ohms (30 W music). Voltage gains of the amplifier is fixed at 30 dB.

SPECIFICATIONS :
– Power supply: 12 V symmetrical dual voltage
– Maximum Power Output RMS: 2 x 15W / 4 ohms, 2 x 10 W / 8 ohms
– Maximum power output music: 2 x 30 W / 4 ohms
– Harmonic Distortion: 0.007% (1 W / 1 kHz)
– Input sensitivity: 300 mV / 20 kOhms
– Frequency: 7 Hz to 60 kHz (-3 dB)
– 70 dB for each channel
– Output power (R = 8 ohms): 2 x 10 W RMS
– Output power (R = 4 ohms): 2 x 15 W RMS
– Bandwidth (-3 dB): 7 to 60 000 Hz
– Sensitivity to maximum power (8 ohms): 290 mVrms
– Sensitivity to maximum power (4 ohms): 250 mVrms
– Input impedance: 20 kilohms
– S / N Ratio: 98 dB
– Crosstalk: -70 dB
– High quality stereo amplifier
– Low noise
– Protection against overload

Parts list :
R1 …. 8.2 Ω 1/4 W
R2 …. 8.2 Ω 1/4 W
C1 …. 22 nF ceramic
C2 …. 22 nF ceramic
C3 …. 100 nF multilayer
C4 …. 1 uF 63 V Polyester
C5 …. 1 uF 63 V Polyester
C6 …. 4700 uF 25 V electrolytic
C7 …. 4700 uF 25 Vélectrolytique
D1 …. 1N5404
D2 …. 1N5404
D3 …. 1N5404
D4 …. 1N5404
U1 …. TDA1521
Miscellaneous :
1 …… heatsink (Rth less than 3.3 ° C / W)
2 …… 3MA bolts 12 mm Unless otherwise specified, all
resistors are 1/4 W 5%

The post 30W Stereo power amplifier based TDA 1521 appeared first on Amplifier Circuit Design.

In the circuit, two TDA2040 ICs are wired in BTL (bridge-tied load) configuration to provide 30W of output into 8 ohm speakers at + /-16V DC. The capacitor C1 is the decoupling capacitor DC input. Network with components R2, C4, R3 provides feedback for IC1 while R7, C6, R8 network provides information for IC2. Network C5, R5 and C9, R9 provides stability at high frequency. Capacitors C2, C3 filters the positive supply rail while the capacitors C7, C8 filters the negative supply rail.

30 watt audio amplifier Parts list :
R1, R2, R4, R6, R7 : 22k
R3, R8 : 680 ohm
R5, R9 : 4.7 ohm
C1 : 2.2uF
C2, C7 : 100uF
C3, C8 : 100nF
C4, C6 : 22uF
C5, C9 : 0.1uF
IC1, IC2 : TDA2040

The post 30 watt audio amplifier based TDA2040 appeared first on Amplifier Circuit Design.