By Means Of "clamp" Circuit Operated By Switching Circuit (epo) Patents (Class 348/E5.071)
  • Patent number: 12191818
    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.
    Type: Grant
    Filed: September 16, 2022
    Date of Patent: January 7, 2025
    Inventor: Paul R. Higgins