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Date Posted: 20:48:04 11/19/01 Mon
Author: lcs
Subject: Re: Variable Cap & Crystal
In reply to: Wilfredo 's message, "Variable Cap & Crystal (Sakman)" on 19:44:17 11/19/01 Mon

I'd suggest a single 74LS124 with the
crystal connected at pins 4-5. It is
very stable. You can add a pot to
control the VCO if you want to.

Connect pin 7 (out) directly to OSC/In
of the PIC and use the same 7805 of
the 3chip board as power supply.

Lcs





>It will be nice to know the part numbers used for the
>variable cap and the cristal . This way all of us will
>be in the same ballpark if we encounter problems. I
>think these two items are the most critical.
>By the way Sakman, I already programmed an SX18 , and
>it improved my 4.2 a lot.But I have had to tweak the
>variable cap too many times for my liking. Also the
>colors are all washed.I hope the new version improves
>this.
>SALU2
> Wilfredo

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Replies:

  • Re: Variable Cap & Crystal (Sakman) -- sakman, 11:55:26 11/20/01 Tue
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