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  1. M

    Hi, center tap transformer, how to calculate?

    Hi, can somebody, explain me, HOW I HAVE TO CALCULTE this tapped transformer? i have this site www.zen22142.zen.co.uk/Theory/tunedcct.htm i calculate Impedance for example of this circuit the total inductance, in serie with 1416n tapped 313n total round 1720n, there is 10.7Meg plus inductance...
  2. M

    Hello, do somebody know ltspice

    hiMm i haveone question, why i have to whait so long for result transient, transient 100m about 1 hour a half
  3. M

    How to make FM modulated signal in SIEMTRIX ? how to configure sffm

    Hello, please can somebody help me, how to configure signal modulated for fm receiver 88-108Mhz i have SFFM? but i dont know how to configure? somebody can help me please? thanks
  4. M

    Hello, can somebody help wich transistor is like bfg520

    Halo, i am working on oscillator in multisim, but in database in multisim they dont have this transistor can somebody help to find equivalen transistor please.... for multisim thanks
  5. M

    Hello, can somebody tell what to use an equivalent of NE5205AN wideband amplifier

    Hi to everybody can somebody help what can i use an equivalen of NE5205AN wideband amplifier and BFR84 dual gate mosfet? I need for fm tuner I dont have also in LTSPICE those components to make experiments thnx, have a nice day.
  6. M

    Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

    Hello, i build the radio like they say in the book, and i did everything with VOM(testing with only multimeter), everything was like in book , but when i finish, i switch to am or fm, i just hear high noise :( I Measure, Test Point, without connection a speaker(because i thought the speaker was...
  7. M

    Hi, can somebody help me with feedback circuit

    Hello to everbody, can somebody expain how work and what they form feedback capacitor inductor resistor, if it was only resistor feedback i understand, but this make me dificult to understand with capacator and inductor.... and also L2...thnx.
  8. M

    Hello, i need a little help with inductor used in jfet

    Hello can somebody help, what do the inductor L1 is to stop high frequency of wat, this is circuits
  9. M

    Hello, can somebody help me with an240P

    Hello, i make am/fm radio kit superregenerative radio, and trf am, but is to much noise, i want to try to make FM superheterodyne receiver, i buy this ic an240p, but to tell you the truth, i dont know good how to use it, whithout your help forum(i can doit) and i know how to use lm386 is easy...
  10. M

    I buy am/fm radio kit but something i dont understand

    Hi, i buy this kit AM/FM RADIO KIT EL21 I thought they explain something but pfff nothing.... but the problem is that, they dont explain how it works circuit but only how to mount in board transistor resistor etc, something i dont understand for example the left half circuit side i understand...
  11. M

    NPN PNP coupling capacitor

    Hi, can somebody explain me how this circuits works? please, i dont understand input capacitor and C2 and C3. Thanks
  12. M

    Ferrite rod antenna explanation

    hello to everybody, can some help to make a ferrit rod antenna and to explain me thnx is for am radio, trf regenerative i have a ferrit rod 90mm diameter, and i have 0.5mm wire magnetic thnx
  13. M

    Replace variable capacitor with varicap

    Hi, to everoyne, i post before this circuits am receiver, wich i take from one site(is for experiment), can somebody tell me, how to replace variable capacitor with varicap IN THIS CIRCUIT , to remove variable capacitor, I have varicap BB112
  14. M

    Hello, varactor(varicap) formula help

    hello can somebody help me how to measure maximum capacitance of varicap, or formula one example thanks
  15. M

    i need to find those variable capacitor

    hello i buy allmost all thing needed, for buil you own radio circuits 2013, but in electronics shop he told me , there are old, you can find it only in old radio he cant help, those components dont sell anymore, maybe somebody can help me how to find online those component VC1: two-gang...
  16. M

    Hello can somebody teach me how to connect am to arduino

    Hello, can somebody teach me, what i need to connect an am receiver to arduino, what do i need to do? thnx
  17. M

    Hello can somebody tell me please collector capacitor

    Hello can somebody help with t his is c1 and R2 RC time of i dont know;-) what do the capacitor??
  18. M

    Hello can somebody tell me, how come 10mA this current source

    can somebody tell me this circuits calculations, how come 10mA please
  19. M

    hello 3N187, where to find this type of mosfet in ltspice,

    hello 3N187, where to find this type of mosfet in ltspice,, because i am reading one good book and inedd this mosfet 3N187nin ltspice, any ohter help is welcome
  20. M

    Please help to buy those components

    please can somebody help, how to find in electronics shop online those components and to buy, is here juse one to make for all, i need juse one, wich i can use for all projetcs L1 antenna coil: 470uH with 1 turn wrapped = 2 L2 antenna coil: 470uH primary, 23uH secondary = 2 L3 antenna coil...
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