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Posts tagged 80M

Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

Electronic Circuit Diagram driver bridge pre power Amp 20Hez with 2SC1469

Electronic Circuit Diagram driver bridge pre power Amp 20Hez with 2SC1469

EPROM burner card circuit diagram

EPROM progrogramer does NOT use any device to output a voltage to the PC printer port, only a current sink. All inputs from the printer port are buffered. In this way there is little or no possibility of damage to the printer port, even with most wiring error possibilties during construction. This EPROM burner will […]

Simple headphone amplifier circuit

Simple headphone amplifier circuit using LM386

Audio amplifier AN7135 7w

Audio amplifier AN7135 7w Electronic circuit diagram audio amplifier AN7135 7w

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