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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 audio amplifier AN7135 7w

Electronic circuit diagram audio amplifier AN7135 7w

Audio Mixer circuit diagram Using FET 2N3819

Audio Mixer circuit diagram Using FET 2N3819 This simple circuit mixes two or more channels into one channel  stereo into mono. Parts R1, R3 10K Pot R2, R4 100K 1/4 W R5 6.8K 1/4 W C1, C2, C3 0.1uF Q1 2N3819 FET MISC Wire, Shielded (Metal) Case, telephone Or Other Plug For Output

Piezoelectric Triggered Switch circuit

Piezoelectric Triggered Switch circuit using BSS84ZX, ZVN2106

LCD Modules diagram

LCD Modules using PCF8574 8 bit I2C LCD Modules using PCF8574 8 bit I2C

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