MAX2606 VHF FM Transmitter


Posted on Feb 6, 2014

To be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89. 5 to 108 MHz ” but building such an oscillator using discrete components is not that easy. Maxim now has available a series of five integrated oscillator building blocks in the MAX260x serieswhich cover the frequency range between 45


MAX2606 VHF FM Transmitter
Click here to download the full size of the above Circuit.

and 650 MHz. The only other thing you need is a suitable external coil, dimensioned for the midrange frequency. The MAX2606 covers the VHF band, although the frequency can only be varied by approximately ±3 MHz around the midrange frequency set by the coil L. The inductance values shown in the table can serve as starting points for further experimenting. The SMD coils of the Stettner 5503 series are suitable for such oscillators. In Germany, they are available from BG rklin ( with values between 12 nH and 1200 nH. You can thus directly put together any desired value using two suitable coils. If you want to wind your own coils, try using 8 to 14 turns of 0. 5-mm diameter silver-plated copper wire on a 5-mm mandrel. You can make fine adjustments to the inductance of the coil by slightly spreading or compressing the coil. The circuit draws power from a 9-V battery. The BC238C stabilises the voltage to approximately 4 V. Although the MAX2606 can work with a supply voltage between +2. 7 V and +5. 5 V, a stabilised voltage improves the frequency stability of the free-running oscillator. The supply voltage connection Vcc (pin 5) and the TUNE voltage (pin 3) must be decoupled by 1-nF capacitors located as close as possible to the IC pins. The tuning voltage TUNE on pin 3 may lie between +0. 4 V and +2. 4 V. A symmetric output is provided by the OUT+ and OUT pins. In the simplest case, the output can be used in a single-ended...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Nocturnal Animals Whisker
    Two-Wire Intercom
    Bus masters diagram
    ems metaboard
    variable power supply with l200
    stk4038 bassed 60 watt audio
    From Schematic to Veroboard
    Q METER
    Several gates as a crystal oscillator circuit
    External wiring diagram of PLC
    Video cable driven by the MAX4104 4105 4304 4305 s an enlarged schematic
    Constituted by the PGA203 and ISO102 Isolated programmable gain instrumentation amplifier



    Top