Parts

[Mark Graalman WB8JKR]

  Jim,

  A P.E.C is simply a R/C phase shift network used with
feedback to create a audio oscillator. The componet
values determine the frequency of the shift and
thus the audio frequency. The P.E.C in the Heath
gear can be duplicated on a small piece of pef board.
 The circuit is:

    input---C1----C2----C3----C4----C5---- output
                        |         |        |         |
                      R1      R2    R3     R4
                        |         |        |         |
                     gnd    gnd  gnd   gnd

  Whereas C1-C5 are 500 pf 5% silver mica caps
and R1-R4 are 470 K ohm 1/4 watt resistors.

73,  Mark  WB8JKR


>WORKS.COM> writes:
> To all keepers of the green
>
> This may have been addressed before but can anyone fill me in
> on what a PEC is?  I have seen them in all sorts of gear.  Were
> these
> standard off the shelf items or were they custom made to the OEM's
> specifications?
>
> Is there any information on what is in the ones that Heath used so
> we could make up a replacement circuit?
>
> This list is full of knowledgable people and I am sure someone has
> the low down on these things.
>
> Inquiring minds want to know.
>
> 73
> James True N5ARW
> in beautiful Hot Springs National Park, AR
> http://www.boatanchor.com

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