Walkman bass upgrade circuit

Published:2011/4/29 1:22:00 Author:TaoXi | Keyword: Walkman, bass upgrade | From:SeekIC

The LAG665 and LAG668 are single cassette player IC, LAG668 is the improved mode of LAG665, their internal circuits are very similar. For the bass lovers, they can replace LAG665 with LAG668 and change the external circuits to upgrade the bass. Low frequency enhance measures is always to attenuate high or medium frequency. After the high or medium frequency has been attenuated, the signal falls off to influence audio sensitivity and dynamic effects, so the volume falls down and can not meet rated output power. The remedial measures are: 1.Improve the voltage gain of the front stage; 2. Increase the level of first voltage amplification; 3. Improve the rear level's input impedance to improve the input sensitivity by small stimulation; 4. Increase the gain of amplifier. The LAG668 uses the 3 and 4, the first: improve the rear stage's (attenuator) input impedance to 200kt2; the second: improve the power amplifier's voltage gain to 38dB. The Walkman bass upgrade circuit is as shown, channel 1's tone network is the same to channel's.



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