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i have two questions to ask you 1, Your transmitter`s oscillator and rf amp works on 2.5 volts? 2, what is the output of LM2931A on 2.5 volts? thanks

which brand contain sensitive and good selectivity receiver? from above

Hi, today i went to market, for buying a good FM radio. but i found many radios, thay have also old japnese brands. like National, Panasonic, Sony, Aiwa, Victor, sanyo i didnt understand which brand to buy. plz help thanks

sorry i forgot to mention that I m using this preamp with your transmitter http://www.uoguelph.ca/~antoon/circ/preamp.htm and your transmitter is worked when my battery voltage goes down to 2.5 volts It means its oscillator which is connected with voltage regulator IC, and rf amp transistor which is connected directly, will also work on 2.5 volts ?

Hi Audioguru I m using ur FM transmitter you said it will not work on less then 5 volts. it also worked on 2.5volts? why? I m using transistor shaped voltage regulator IC like yours.

i didnt found NTE123AP transistor in my city. what transistor i will use in the place of this transistor. thanks

I Want to change my FM radio frequency 109-120 MHZ. because i want to tune my FM transmitter in between 109-120 MHZ. this is my question from first to last.

http://www.gatago.com/rec/radio/swap/23839865.html

i have four turns of coil in my radio receiver. by removing one turn it will happen?

I want to tune FM transmitter on that frequency. i think by adjusting coil or variable cap we move FM radio frequency for some MHZ.

Plz Reply

HI all I want to change my FM radio frequency 109-120 MHZ, will it happen by changing the coil or variable capacitor? and i also want to change my other FM radio frequency to air band 118-136 MHZ what can i do? thanks in advance:)

hi AN920 and Audioguru :) hi AN920 i like your circuit :) thanks :) but still i have a question.... it will drift its frequency, can i use Audioguru`s circuit in the place of your 100mW circuit. and also i m thinking about using good RF transistors in the place of 2N3904. i think it will do the job. both of you plz think and any body who is reading this, and tell me about good transistors for using in the place of 2N3904. thanks..

i found many high power transmitter on net but they are all drift fequency or very big circuits (a lot of parts and coils), high voltage and very complicated. i want small & stable circuit like yours but incease power like 500mW or 1W. thanks. plz think about mod-5 ;)

you know any transistor which i use in the place of 2N3904 which will increse the power?

Hi Audioguru i want to use your FM Mod-4 on 11 Volts. will it incease the output power to 500mW? thanks:)

Link http://www.ajpotts.fsnet.co.uk/Circuits.html

input power?? this is written on its web "This Narrow Band FM VHF transmitter will output approximately 250mW of RF power using a 2N2222 and can operate between 75 and 146MHz"

circuit

Hi Sir Audioguru what do you think about this transmitter it is good transmitter or not. its out put is written on its web is 250mW is it right? thanks in advance.

here is the circuit diagram

circuit diagram

Hi All, I want to built this transmitter, plz give your suggestions about this transmitter. http://www.ajpotts.fsnet.co.uk/Circuits.html

20mW or 250mW?

this is the only(directional antenna) technique, or other military or other secret sevices use different techniques and equipments?