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Posts tagged QRP

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 Low distortion audio Headphone

Electronic circuit diagram Low distortion audio Headphone

Making power amplifier 30 – 100watts

Now this is an interesting amplifier and can be built for almost any AF power level you want from or more. I will give you suitable examples for the 30 – 100watts version. RV must be set to minimum resistance before application of power. To set up the amplifier, advance RV SLOWLY whilst monitoring the […]

quad system circuit

quad system circuit using LM324, Lm324A, LM224, LM2902, LM2902V, NCV2902 Single Supply Quad Operational Amplifiers using LM324, Lm324A, LM224, LM2902, LM2902V, NCV2902 The LM324 series are low-cost, quad operational amplifiers with true differential inputs. They have several distinct advanteges over standard operational amplifier types in single supply applications. The quad amplifier can operate at supply […]

Making RF Switching for terror

When switching an antenna between a transmitter and receiver, the 1N914 or 1N4148 can still be used, but with decreasing success as the frequency rises. It is common practice in VHF transcievers to use a PN junction diode, but with a lightly doped “Intrinsic” region between the P and N layers. The diode is called […]

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