View single post by Toadmund
 Posted: Jun 3rd, 2014 04:09 PM
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Toadmund

 

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Kit Here
From what i understand so far about the varicap (varactor diode) is that it is controlled by voltage, and the tuning knob on this kit is a 50k pot.
Now what I assume I need is a way to replace this 50k pot with a circuit to creep up the voltage in steps in order to sweep.

A capacitor resistor circuit sounds about right, but then that would be a gradual increase or decrease in voltage and not a series of sweep 'steps' like a typical ghost box would do.

Would I need something that will pulse square waves like a 555 timer chip?
(I have a ton of those)

Will this kit work as a ghost box if modified?

Thanks.

Last edited on Jun 3rd, 2014 04:11 PM by