Posts Tagged ‘fm receiver’

FM – AM Regenerative Receiver by 2N2646

The following is a design for a separately quench super regen receiver I first tried in early 1992. It worked far better than any other solid state design, so I built a portable version for use during my commuting from the Blue Mountains to Sydney on the train. Running off 10x AA nicads, this gave me a weeks listening before recharging. Only recently, I submitted the basic circuit to Silicon Chip, whereupon it was published in the April 2003 issue (and I won a nice true RMS meter as a result). My portable version differs in that I use varicap tuning, the output transformer has a 1K primary, and the output transistor is a BC108, with bias components to suit. It also uses the headphone lead for the aerial.

Read More Source:http://www.users.bigpond.com/cool386/6tr/srrx.html

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FM Receivers by TL431 – 2N4416

Here is how you make a superregenerative circuit. Choose a regenerative amplifier circuit configuration that requires more current during oscillations than when not oscillating. Adjust the regenerative amplifier to oscillate. Add a small circuit that uses the current of the amplifier to charge a capacitor while oscillations are taking place. Once the capacitor is charged, the voltage on the capacitor is used to kill the oscillations of the circuit. (Technically, the capacitor voltage shifts the operating point of the amplifier to reduce its gain and stop the oscillations.) When the oscillations stop, the capacitor discharges (through a resistor). Once the capacitor is discharged, the oscillations begin again.

Source:http://www.somerset.net/arm/fm_only_lowtech.html
Thank you.

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FM Stereo Receiver by TEA5711T

Let’s begin by soldering a three-pin ceramic filter to the PCB. These three pins will be coming from terminals #11, #12 and #13 of the TEA5711T chip. Next, solder another three-pin ceramic filter to the PCB. These three pins will be coming from terminals #7, #8 and #9 of the TEA5711T chip. Once that is done, continue with another three-pin ceramic filter by snipping off the center pin on the ceramic filter. Then go ahead and solder it to the PCB. This filter will be coming from terminals #5 and #6 of the TEA5711T chip.

Source:http://braincambre500.freeservers.com/TEA5711T%20FM%20Receiver.htm
Thank you.

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