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Old 08-14-2011, 09:20 AM
johncena johncena is offline
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Default Poly Variable Condenser (Pinout Question)

How do you connect the Poly Variable Condenser ( it has 3 pins) to the TDA7000 FM Receiver which only requires 2 pin for the Resonator part of the circuit.

i need that 2-60pF range of the PVC and i want to know what will i use between those 3 pins.

The technical spec is here --> http://mzentertainment.com/technical..._capacitor.gif

and here's the spec:

TTWM Poly Variable Condenser / Capacitor.
Two section, apx 60pF and 140pF max.
Commonly used in portable transistor AM/FM radios.


Here's the pic:

http://mzentertainment.com/store_pp_...00140_zoom.jpg

I would like to post the schematic, but unfortunately, the website was down at the moment.

But getting that 2-60pf in series with 56pf and parallel with 33pF and 56nH inductor will provide a 85Mhz to 113Mhz
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Old 08-14-2011, 09:25 AM
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Kermit2 Kermit2 is offline
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The center pin is common to both and without a clear indication on the datasheet, I would GUESS the Osc section would be the left side and the Ant section the right side when viewed from above with the pins toward you. If not then its the other way around

You just need to make connection with two pins. you can bend the other one up and allow the other two to go into the board. Be gentle. You may have to unbend it and bend the other side up if you get the wrong side.
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Old 08-14-2011, 10:01 AM
johncena johncena is offline
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Quote:
Originally Posted by Kermit2 View Post
The center pin is common to both and without a clear indication on the datasheet, I would GUESS the Osc section would be the left side and the Ant section the right side when viewed from above with the pins toward you. If not then its the other way around

You just need to make connection with two pins. you can bend the other one up and allow the other two to go into the board. Be gentle. You may have to unbend it and bend the other side up if you get the wrong side.

Thanks!, now i'm sure that Osc is in Leftside and Ant in the right side..
I just noticed it in the picture (the last part) there is a "O" and "A" lettering...
Thanks for the clarification on the pin parts.
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