Description:

The NTE1648 and NTE1649 are bipolar integrated circuits in an 8–Lead DIP type package designed for telephone bell replacement.

Features:

• Designed for Telephone Bell Replacement

• Low Current Drain

• Small Size 8–Lead MINIDIP Package

• Adjustable 2–Frequency Tone

• Adjustable Warbling Rate

• Built–in Hysteresis Prevents False Triggering and Rotary Dial “CHIRPS”

• Extension Tone Ringer Modules

• Alarms or Other Altering Devices

• External Triggering or Ringer Disable (NTE1648)

• Adjustable for Reduced Supply Initiation Current (NTE1649)

Functions:

• Two Oscillators

• Output Amplifier

• Power Supply Control Circuit