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Posts tagged DPDT、

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.

Audio switcher circuit

Audio switcher circuit using MTP3055, 1458

Audio power amplifiers

Audio power amplifier circuit is used AN7112

Single Chip 60W Audio circuit

Single Chip 60W Audio circuit using LM3886

Touch switch circuit for PC board

Touch switch circuit for PC board using B5584ZX, B55138ZX, 74HC14

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