FM Wireless HI-FI circuit

Posted on Feb 6, 2014

Circuit To relieve you of any concern related to high frequency, I used a module ready, in case a module Aurel audio FM transmitter. This tiny circuit board with 2 cm by 4 cm supports a transmitter modulation frequency track, delivering an RF power of 10 mW which is quite sufficient for the desired use. As it is driven by a resonator surface wa As

FM Wireless HI-FI circuit
Click here to download the full size of the above Circuit.

you can see the review of the scheme, the module can stand alone even for some HF itself since it lacks power and a network of pre-emphasis R7, R8, C6, designed to improve quality transmission of higher frequencies. The input level required by the circuit to achieve a sufficient modulation rate of 100 mV rms, a preamplifier is necessary for our microphone. It is the role of IC1, mounted on a very classic inverting amplifier with adjustable gain through P1. The provided microphone is a model electret with its supply circuit formed by R1, R2 and C1, but you might as well use a conventional dynamic mic, or an external electret microphone with its integrated power supply in which case R1, R2 and C1 disappear. As to the transmitter, I used a module Aurel, which is an FM audio receiver. It also appears as a tiny circuit board containing all the components of the receiver, equipped with a squelch circuit or quiet as I put to good use. As illustrated, the audio output takes place on the leg 10 of the module and should be dG©saccentuG©e through capacitor C4 to offset the effect of pre-emphasis circuit used in the show. The AF level issued by the module may be insufficient for some high fidelity amplifiers or mixers certain: it is only 100 mV in the best cases I amplifies a bit through rose IC1 very classic. This preamplifier is fed continuously as the module Aurel but instead receives its power through the leg 18 of the latter....

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Rugged lamp driver
    Inverter Circuit
    op amp Flow of current in a simple inverting amplifier circuit
    simple 2 watt small switching power
    FT232 USB to Serial Module
    Standlight circuits
    Based on AT89C52 minimum system interface circuit