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The NTE1648 and NTE1649 are bipolar integrated circuits in an 8--lead DIP-type package designed for telephone bell replacement. They include adjustable 2--frequency tone and an adjustable warbling rate. Built--in hysteresis prevents false triggering and rotary dial "chirps".
External triggering or ringer disable (NTE1648)
Adjustable for reduced supply initiation current (NTE1469)
VCC = 30V
PD = 400mW
Topr = --65° to +150°C
Tstg = --65° to +150°C
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