Ringer circuit

A ringer circuit comprising:

• an input signal source,
• a Push-Pull signal amplifier connected to said input signal source for receiving and amplifying an input signal from said input signal source;
• a direct current source connected to said Push-Pull signal amplifier for providing power thereto;
• a positive voltage comparator circuit connected to said Push-Pull signal amplifier for receiving a positive input signal therefrom;
• a negative voltage comparator circuit connected to said Push-Pull signal amplifier for receiving a negative input signal therefrom;
• and
• a switching circuit having one input connected to said positive voltage comparator circuit for receiving an input signal therefrom and another input connected to said negative voltage comparator circuit for receiving an input signal therefrom,
• wherein said switching circuit de-energizes said direct current source if said input signal to said positive voltage comparator and said input signal to said negative voltage comparator exceed at least one set value.

A ringer circuit comprising:

• an input signal source,
• a Push-Pull signal amplifier connected to said input signal source for receiving and amplifying an input signal from said input signal source;
• a direct current source connected to said Push-Pull signal amplifier for providing power thereto;
• a positive voltage comparator circuit connected to said Push-pull signal amplifier for receiving a positive input signal therefrom;
• a negative voltage comparator circuit connected to said Push-Pull signal amplifier for receiving a negative input signal therefrom;
• and
• a logical AND circuit having one input connected to said positive voltage comparator circuit for receiving an input signal therefrom and another input connected to said negative voltage comparator circuit for receiving an input signal therefrom,
• wherein said logical AND circuit de-energizes said direct current source if said input signal from said positive voltage comparator and said input signal to from negative voltage comparator are the same.