555 DC sound erasing to AC sound erasing circuit

Published:2011/6/7 21:08:00 Author:TaoXi | Keyword: 555, DC, sound erasing, AC | From:SeekIC

The general recorder uses the DC sound erasing mode, so the recording noise is large. Figure 14-10(a) is the DC sound erasing circuit. Figure(b) is the AC sound erasing circuit. The astable multivibrator is composed of the 555 and R4, C1, f=1.44/R4C1, the figure parameters' oscillation frequency is about 200Hz, the pin-3 outputs the driving amplifier to supply the sound erasing current to the sound erasing circuit.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/555_DC_sound_erasing_to_AC_sound_erasing_circuit.html

Print this Page | Comments | Reading(3)