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US6437648B1 - Audio amplifier with transformerless …

    https://patents.google.com/patent/US6437648B1/en
    US6437648B1 - Audio amplifier with transformerless power supply - Google Patents. In a high-fidelity, high-power audio amplifier, the power supply …

Audio amplifier with transformerless power supply - VAN ...

    https://www.freepatentsonline.com/6437648.html
    21 rows

US5498997A - Transformerless audio amplifier - Google …

    https://patents.google.com/patent/US5498997A/en
    A transformerless solid state audio amplifier which exhibits the superior linearity and saturation characteristics of a triode vacuum tube amplifier, and which has an output impedance which...

AES E-Library » A New Transformerless Amplifier Circuit

    https://www.aes.org/e-lib/browse.cfm?elib=88
    abstract={a transformerless amplifer is described using four tubes connected in a bridge circuit and so driven that each tube delivers equal power to a common load. the ac equivalent circuit of the amplifier may be represented by a generator of voltage 2µe(symbol) in series with the plate resistance rp of one tube. the amplifier is characterized by wide frequency response, low …

Transformerless Power Supply Design - Designer …

    https://designercircuits.com/DesignNote1c.pdf
    Transformerless AC power supplies accept wall-outlet AC voltage (such as 120VAC) input and produce a low voltage DC (such as 3VDC) output. The low voltage DC is typically low current output, on the order of tens of milliamps. This DesignNote explains how transformerless power supplies work and examines tradeoffs to consider when designing them.

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