Mini Car Subwoofer Amplifier Circuit Diagram
The mini car subwoofer output 22W into 4 ohm amplifier, Variable Low Pass Frequency: 70 – 150Hz
This unit should be connected to an amplifier of the car audio using the often-needed additional “punch” to music by a subwoofer. Since the very low frequencies are spherical, an amplifier needs to lead this special speaker. The used power amplifier is a good and inexpensive BTL (Bridge Amplifier) 13-pin IC from Philips (now NXP Semiconductors) were prepared to offer a very small number of parts and can be 22W at 4 ohm load on the battery voltage of 14.4 V production car audio.
Stereo signals from the output line of the amplifier of the radio are mixed at the entrance to the control level and, vice versa, the signal between the buffer and can be phase IC1A SW1. This control can be useful, so the subwoofer can be in accordance with the speakers of the existing car radio. Then a filter 12dB/octave variable low around IC1B, Q1 and associated components pass for just the low-pass frequency of 70 to 150Hz built set. Q2, R17 and C9 form a simple DC voltage stabilizer for the input and filter circuits, useful to prevent the interaction of the positive rail output stage with low-level sections.
IC2 must be attached to a finned heat sink mounted
Through all the long time constant R17 and C9 in the voltage stabilizer, the amplifier is fully functional for about 15 to 30 sec. after switching on.
Mini Car Subwoofer Technical data:
Output power (1 kHz sine wave):
22W RMS into 4 Ohms at 14.4V
Input 250mV for full output
20Hz to 70Hz-3dB with the cursor P2 focuses entirely on the R12
20Hz to 150Hz-3dB with the cursor P2 concentrated on the R11
17W RMS: 22W RMS 0.5%: 10%
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