Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Varicap for 88-108 MHz FM

Status
Not open for further replies.
boy

boy

Advanced Member level 1
Joined
Sep 30, 2002
Messages
481
Helped
98
Reputation
196
Reaction score
58
Trophy points
1,308
Location
Thailand
Activity points
3,963
varicap fm

Hi guys,

Any sugestion for a varicap that can be use for the entire FM radio band. I have tried some but none of them can cover the entire range. It would be nice if Vtune is less than 3 v. Thank you
 

fm varicap

Hi,

Search for some schematics designs over the web or look at these links :

h**p://hem.passagen.se/communication/fm_500.html

h**p://hem.passagen.se/communication/fm_pll_vco.html

h**p://www.semiconductors.philips.com/markets/mms/products/discretes/featured_products/rf_varicaps/

h**p://www.semiconductors.philips.com/acrobat_download/other/discretes/philips_rf_manual_6th_edition.pdf

Replace * by t
 

    boy

    boy

    Points: 2
    Helpful Answer Positive Rating
fm varicap schematics

Suitable diodes have about 35 to 40pF at 3V and capacitance ratio about 2.5. Such diodes are BB204 (double, 30V), BB914 (double, 8V), KV1561 (single), KV1310(double, 8V), KV2201, KV2202, KV2204, MV209, MV2111, MV104.....
 

    boy

    boy

    Points: 2
    Helpful Answer Positive Rating
kv1310 varicap

Hi

If u want a 3V varicapdiode then choose BB202 from Philips.
See their website...
This is much more modern diode as the old ones intended for 8V and 30V.
Commercially available FM recvrs such as the TEA57xx family do use them.

rgds

Mike
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top