GL6840A - Electronic Two Tone Ringer
GL6840A are monolithic integrated circuits designed to replace the mechanical bell in telephone sets, in connection with an electro acoustical converter.
The device can drive either directly a piezo ceramic converter(buzzer) or a small loudspeaker.
In this case a transformer is needed.
The two tone
GL6840A Features
* Test Circuit For GL6840A f1 =
* Low current consumption, in order to allow the 1000 f 2 = 0.717 x f1 fsweep = parallel operation of 4 devices C1(
* Ý )
* Integrated rectifier bridge with zener diodes to 1
* Þ 2.2
* Ú protect against overvoltages Buzzer
* Little ext
