LM1036 datasheet(5/10 Pages) NSC

5 / 10 page

Application Circuit

Applications Information

OBTAINING MODIFIED RESPONSE CURVES

The LM1036 is a dual DC controlled bass, treble, balance

and volume integrated circuit ideal for stereo audio systems.

In the various applications where the LM1036 can be used,

there may be requirements for responses different to those

of the standard application circuit given in the data sheet.

This application section details some of the simple variations

possible on the standard responses, to assist the choice of

optimum characteristics for particular applications.

TONE CONTROLS

Summarizing the relationship given in the data sheet, basi-

cally for an increase in the treble control range C

t must be in-

creased, and for increased bass range C

b must be reduced.

Figure 1 shows the typical tone response obtained in the

standard application circuit. (C

t=0.01 µF, Cb=0.39 µF). Re-

sponse curves are given for various amounts of boost and

cut.

Figure 2 and Figure 3 show the effect of changing the re-

sponse defining capacitors C

t and Cb to 2Ct, Cb/2 and 4Ct,

b/4 respectively, giving increased tone control ranges. The

values of the bypass capacitors may become significant and

affect the lower frequencies in the bass response curves.

DS005142-3

DS005142-4

FIGURE 1. Tone Characteristic (Gain vs Frequency)

DS005142-5

FIGURE 2. Tone Characteristic (Gain vs Frequency)

DS005142-6

FIGURE 3. Tone Characteristic (Gain vs Frequency)

LM1036 Scheda tecnica(PDF) 5 Page - National Semiconductor (TI)