Automatic Shutdown Circuit

Automatic Switching Circuit

Components

Functional Description

1.

R

i

Inverting input resistance which sets the closed-loop gain in conjunction with R

also forms a high pass filter with C

2.

C

i

Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also

creates a high pass filter with R

External Components, for an explanation of how to determine the value of C

3.

R

F

Feedback resistance which sets closed-loop gain in conjunction with R

DS012343-3

FIGURE 2. Automatic Shutdown Circuit

DS012343-4

FIGURE 3. Automatic Switching Circuit

www.national.com

4