Help: receiver circuit

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parthshah08

Member

• Aug 23, 2010

• #1

if i've got a transmitter circuit ....then can i get a receiver circuit for it?

 

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LTX71CM

New Member

• Aug 23, 2010

• #2

I believe the receiver is a standard FM radio.

 

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parthshah08

Member

• Aug 23, 2010

• #3

thanks.... that will prove helpful

 

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parthshah08

Member

• Aug 23, 2010

• #4

hey ...one more thing. How do i calculate the frequency of that circuit?

 

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LTX71CM

New Member

• Aug 23, 2010

• #5

When building transmitters such as those I think most hobbyists just talk into the microphone while slowly tuning a radio until their voice is heard.

 

MikeMl

Well-Known Member

Most Helpful Member

• Aug 24, 2010

• #6

LTX71CM said:

When building transmitters such as those I think most hobbyists just talk into the microphone while slowly tuning a radio until their voice is heard.

Click to expand...

And hope like hell that you even hit the 88-108Mhz FM band...

 

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parthshah08

Member

• Aug 24, 2010

• #7

lol...that should be hit.


lennon_7

 

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colin55

Well-Known Member

• Aug 24, 2010

• #8

Your circuit is over-designed and uses some incorrect values. Here is a better design:

**broken link removed**

 

Last edited: Aug 24, 2010

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flat5

Member

• Aug 25, 2010

• #9

Collin, do you really mean 68k feeding the mic and giving it 0.2v?
I suspect 6.8k would be a better choice.

 

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colin55

Well-Known Member

• Aug 25, 2010

• #10

I use high quality electret microphones and if you use a low value resistor the mic is over-fed with current and the output becomes so distorted that it sounds like bacon and eggs frying. 6k8 is FAR TOO LOW for 9v. I use 22k - 47k.
Some mics have an internal resistor and that's why you see some circuits with an additional low value resistor supplying them.