Posted on Mar 9, 2013

A variable oscillator covers 3.2 to 22 MHz in two bands—providing coverage of 80 through 15 meters plus most crystal-filter frequencies. Optional 455 kHz and 10.7 MHz crystal oscillators can be switched on-line for precise if alignment. Generator output is on the order of 4 volts p-p into a 500 ohm load.

Click here to download the full size of the above Circuit.

A simple voltage-divider attenuator controls the generator's output level, and a second output provides sufficient drive for an external frequency counter.

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