Devices and methods for automatic thermal bias of transistors in musical devices

A device comprising:

• at least one of a heating source and a cooling source for thermal contact with a germanium transistor;
• at least one of an analog circuit and a digital circuit for controlling the at least one of a heating source and a cooling source;
• a voltage divider for selecting an ideal bias voltage;
• and
• the at least one of the analog and digital circuit comparing a present bias voltage to the ideal bias voltage, and controlling the at least one of a heating source and a cooling source in response to a difference between the present bias voltage and the ideal bias voltage.

A circuit system for providing thermal stability to a transistor comprising:

• a comparing circuit in electrical communication with the transistor for receiving a present voltage from the transistor and comparing a present voltage to a predetermined bias voltage;
• a logic gate electronically coupled to an output of the comparing circuit, the logic gate, gate having a high, open position and a low, closed position;
• and
• a heating element thermally coupled to the transistor and electrically coupled to the output of the comparing circuit, wherein when the present voltage is lower than the predetermined bias voltage, the gate is in the high, open position providing current to the heating element, and wherein when the present voltage is higher than the predetermine bias voltage the gate is in the low, closed position.

A method of controlling a bipolar junction transistor, the method comprising:

• electrically coupling a collector of the bipolar junction transistor to a high impedance circuit, the high impedance circuit comprising:
• a filter for filtering AC current received from the collector of the bipolar junction transistor and outputting a present DC current;
• a comparing circuit for receiving the present DC current and determining a present DC voltage, the comparing circuit further comparing the present DC voltage to a predetermined optimal DC voltage;
• a logic gate coupled to an output of the comparing circuit, the logic gate having an open position and a closed position;
• and
• a logic gate electronically coupled to an output of the comparing circuit, the logic gate, gate having a first position and a second position;
• and
• a heating element electrically coupled to the output of the comparing circuit, wherein when the present DC voltage is lower than the predetermined optimal DC voltage, the logic gate is in a first position to turn the heating element on, and wherein when the present voltage is higher than the predetermined optimal DC voltage, the logic gate is in the second position to turn the heating element off;
• and
• wherein the method further comprises the step of thermally coupling the heating element to the bipolar junction transistor.