Constant voltage output circuit

A constant voltage output circuit comprising:

• first and second power source terminals for supplying a power source voltage;
• a series circuit consisting of a first pnp transistor and a first npn transistor, each having its emitter connected to the emitter of the other;
• means for connecting the collector of said first pnp transistor to said first power source terminal;
• load means interposed between the collector of said first npn transistor and said second power source terminal;
• a second npn transistor having its base connected to the collector of said first npn transistor, its collector connected to said second power source terminal and its emitter connected to the base of said first npn transistor as well as connected to said first power source terminal via second load means;
• reference voltage feed means for impressing a reference voltage across the base of said first pnp transistor and said second power source terminal;
• and
• an output terminal connected to the emitter of said second npn transistor, thereby providing a constant output voltage across it and said second power source terminal.