which value would u suggest!

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aj_silverthunder

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here in this schematic,as many said,the RFC value would be 1mH,1uH,100uH.
which one would u select!
and also tell me what if i use the higher value choke and what if i use low value RF Choke!what will be the result !
if the value of the RF choke is not correct would the circuit components get burned or will there be no clarity in the output of the transmitter!
 

The value is not critical, it is there just to prevent RF getting into the amplifier stages through the supply line. 1mH should be fine although there is nothing in the schematic to tell what frequency it is supposed to work at. The wrong value will not do any harm.

It looks like a horribly unstable transmitter though !

Brian.
 

Pay attention to the self resonant frequency of the chokes. The larger the inductance, the lower this frequency. It should be several times your operating frequency.
 

It looks like a typical FM band (88-108MHz) transmitter bug circuit. RF choke value is not critical but SRF value is. You should be safe using about 1uH value
 

flatulent said:
Pay attention to the self resonant frequency of the chokes. The larger the inductance, the lower this frequency. It should be several times your operating frequency.
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what do u mean by operating frequency!
is it the transmitting frequency!

Added after 1 hours 1 minutes:

are u sure that the incorrect value of the RF choke wont damaged the other electronic components!please help me !
 

FYI it will also work with this choke left out (shorted). The choke only help to keep RF out of the audio section. It can't damage anything.
 

thank u very much guys,i thought the incorrect value of choke would damage the circuit!
 

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