ANALOG PRODUCTS DIVISION

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (602) 431-2288

www.protekanalog.com

73

PA4101

PUNK with µP Supervisor

95000 Rev. 0. 01/08

NOT FOR USE IN LIFE SUPPORT SYSTEMS

GND

MUTECONT

MUTE 1

MUTE 2

C16

10µF

C12

1µF

C14

10µF

R15

10K

R16

10K

R14

22K

R13

240K

C13

10µF

C15

10µF

R17

100Ω

R19

100Ω

R21

10K

D1

U2

74LS04

SMUTEOUT

CEXT

R18

10K

R20

10K

LINE OUT LEFT

LINE OUT RIGHT

3.3V

FUNCTION.

GENERATOR

1V PTP 1KHz

SINE WAVE

V.S. 1

S1

3

5

6

9

10

12

8

14

Typical Application Audio Muting.

Notes:

1. A Set Top Box audio output is “simulated” using C14, R15, R16 and VS 1.

2. VS 1 is a signal generator having an output impedance of 50Ohm.

3. U2 is the IC 74LS04.

4. U2 runs off of PUNK Vcc (Output of D1, C16 and R14).

5. Input to U2 is the Set Top Box Vcc

6. Switch S1 serves as a manual “Audio Mute” to enable the muting function.

7. Scope probes were attached to Set Top Box Power Supply and Line Out.

8.

Waveform shown in Figure 4 to Figure 9