Electronic circuit unit that is suitable for miniaturization and suitable for simple output adjustment

摘要

The invention provides a surface mounting typing electronic circuit unit that is suitable for miniaturization and is suitable for simple output adjustment. Circuit elements including capacitors (C), resistors (R), and inductance elements (L) and a conducting pattern connected to the circuit elements are formed on an alumina substrate (1) by means of thin film forming technique, and a diode (D1) and a semiconductor chip of a transistor are fixed to a connection land of the conducting pattern by means of wire bonding, wherein only the emitter resistor out of the base bias voltage dividing resistors and the emitter resistor of the transistor is trimmed for output adjustment.