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US 12,191,818 B2Granted
Musical instrument preamplifier
OwnerPaul R. Higginsinventor
Life of this patent
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Abstract
A musical instrument preamplifier includes a n-type JFET and a pnp current mirror connected to the drain side of the JFET. The pnp current mirror includes two pnp transistors. The current mirror is configured to control the current to independently set the operating point of the JFET and the output. An npn transistor is connected to one of the pnp transistors of the current mirror to form an inverted Sziklai pair. An auto-bias network is connected between the npn and pnp transistors that form the Sziklai pair.
Claims12
A device for pre-amplifying musical instrument signals comprising:
- an n-type JFET;
- a pnp current mirror connected to a drain side of the JFET, the pnp current mirror including first and second pnp transistors, wherein the current mirror is configured to control current to independently set an operating point and an output of the JFET;
- an npn transistor connected to the first pnp transistor of the current mirror to form an inverted Sziklai pair;
- and
- an auto-bias network connected between the npn and pnp transistors that form the Sziklai pair, wherein the auto-bias network comprises a voltage-controlled current source.
2 more elements
A device for pre-amplifying musical instrument signals comprising:
- an n-type JFET;
- a pnp current mirror connected to a drain side of the JFET, the pnp current mirror including a first pnp transistor and a second pnp transistor, the first pnp transistor having a base terminal connected to a base terminal of the second pnp transistor, the second pnp transistor having a collector terminal and its base terminal connected to the drain side of the JFET, wherein the current mirror is configured to control current to independently set an operating point and an output of the JFET;
- an npn transistor having a base terminal connected to a collector terminal of the first pnp transistor of the current mirror to form an inverted Sziklai pair;
- and
- an auto-bias network connected between the npn transistor and the first pnp transistor that form the Sziklai pair.
2 more elements
Dependencies are inferred from the claim text.