Electronic Circuits and Tutorials
Electronic Schematics - F

Frequency Modulation (FM) Circuits

2 Transistor FM Transmitters:

AM / FM / SW Active Antenna: This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On the shortwave band this active antenna is comparable to a20 to30 foot wire antenna. This circuit uses receivers that use untuned wire antennas, such as inexpensive units and car radios. L1 can be selected for the application

FM Beacon Transmitter (88 108 MHz): This circuit will transmit a continuous audio tone on the FM broadcast band (88-108 MHz) which could used for remote control or security purposes. Circuit draws about30 mA from a 6-9 volt battery and can be received to about100 yards.

FM Booster:

FM Broadcast Audio Transmitter : Monophonic FM band transmitter for home use.

FM Radio Bug:

FM Radio Telephone Bug:

FM Radio Telephone Transmitter:

FM Radio Transmitter #1:

FM Radio Transmitter #3:

FM Radio Transmitter #4:

FM transmitter :

Si477x AM/FM Receivers Tune Silicon Labs into Audiophile Market

Improved FM Stereo Modulator:

Long Range FM Transmitter:

Low Power FM Transmitter:

Micro Spy With FETs:

Micro Spy With TTL:

Micro Spy With USW:

MicroPower FM Broadcasting Circuits:

Miniature FM Transmitter #1:

Miniature FM Transmitter #2:

Miniature FM Transmitter #3:

Miniature FM Transmitters #4:

MPF102 FM Receiver:

PLL FM Transmitter:

Small FM Transmitter:

Two Transistor FM Transmitters:

Waveform Generator Demodulates FM Signals: 10/10/96 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

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