in EFY using integrated
circuits. The circuit described here
uses three easily available transistors
only. Even a beginner can easily assemble
it on a piece of veroboard.
The circuit comprises a 3-stage resistor-
capacitor coupled amplifier. When
ring button S2 is pressed, the amplifier
circuit formed around transistors T1 and
T2 gets converted into an asymmetrical
astable multivib-rator generating ring
signals. These ring signals are amplified
by transistor T3 to drive the speaker of
earpiece.
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