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Posts tagged 필터

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.

Touch switch project

Touch switch project using 4011, BC557

FM Stereo Encoder

FM Stereo Encoder for FM Transmitters

Amplifier Circuit Board Using LA4508

Amplifier Circuit Board Using LA4508 For compo TOSHIBA, SHARP, LG, SAMSUNG, PIONEER, PANASONIC, POLYTRON, PHILIPS, SONY 40W Sound Amplifier Circuit Board LA4508  Vcc 12v and 3A

Alarm temperature circuit

Alarm temperature circuit using C828, C458 Alarm temperature circuit using C828, C458

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