Using the TS925 as a preamplifier and speaker driver

TS925

12/17

Figure 16. Electrical schematic

Headphone amplifier

The operators A2 and A3 are organized in a push-pull configuration with a gain of 5. The stereo

inputs can be connected to a CD-player and the TS925 can directly drive the head-phone

speakers. This configuration shows the ability of the circuit to drive 32

Ω load with a maximum

output swing and high fidelity suitable for sound and music.

Figure 19 shows the available signal swing at the headset outputs: two other rail-to-rail

competitor parts are employed in the same circuit for comparison (note the much reduced

clipping level and crossover distortion).

M ICRO P H O N E

C1

C1 4

C2

C3

C4

Mike pream p lifier

C5

AL C

D1

D2

C6

C9

MIK E

OU T P U T

ST BY

C7

Vcc

C1 5

C 1 0

C1 8 C 8

AM PLIF IE R

IN P U T

LE F T

AM PLIF IE R

IN P U T

RIG H T

H e ad ph on es a m plifier

H E AD PH O N E S

Q1

P H A N TO M G R O UND

C9

4

8

9

13

C10

7

6

5

10

10

11

12

C11

C12

C13