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Posts tagged 40M

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.

amplifier electronic circuit

amplifier electronic circuit Equalizer Amplifier circuit With ALC using KA2220 amplifier electronic circuit amplifier electronic circuit

Circuit Diagram Converter trigger signal causes the 555 to discharge the capacitor for synchronization

LM1881 is used to do all the grunt work of separating the sync signals from the composite video. The chip provides the vertical sync on pin 3 for the vertical oscillator, and composite sync on pin 1 for the horizontal oscillator. The intensity signal comes from the composite video signal itself, but is negative. I […]

Fm Receiver Radio Digital Circuit

Fm Receiver Radio Digital Circuit using SP3232EB, PIC24FJ64GA002, LM1117, LM7805

Charge Coupled Mosfet Relay Circuit

Charge Coupled Mosfet Relay Circuit using 74C14, IRFZ48Z

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