Description
Here’s a single chip FM
transmitter circuit using Maxim semiconductors IC MAX2606. The MAX2606
is a compact, high-performance intermediate frequency VCO specially
designed for wireless communication circuits. They have monolithic
construction with low-noise and a low-power operation in a compact
6-pin SOT23 packing .Th1s low-noise IC feature an on-chip varicap diode
and feedback capacitances that avoid the need for external tuning
components, making the MAX2606 perfect for portable systems. Only an
external inductor is needed to set the oscillation frequency.In addition
to this, an
integrated differential output buffer is also there for driving a mixer or prescaler.The MAX2606 can be operated from a single +2.8 V to +5.4V supply and consumes very less current .The chip can be operated from 45MHz to 650MHz .
integrated differential output buffer is also there for driving a mixer or prescaler.The MAX2606 can be operated from a single +2.8 V to +5.4V supply and consumes very less current .The chip can be operated from 45MHz to 650MHz .
In the circuit the nominal frequency is
set to 100 Mhz by inductor L1, (390nH) . The left and right channel
audio signals from your source are added by R3 and R4, and attenuated
by the POT R2. R2 can be used as a volume control .POT R1 can be used
to select a channel of transmission between 88Mhz and 108Mhz.Use 80 cm
long wire as the antenna .
FM Transmitter Circuit Diagram with Parts List.
Single Chip FM Transmitter Circuit Diagram
Notes
- Assemble the circuit on a good quality PCB or common board.
- Use a battery for powering the circuit.It will reduce noise.
- An FM antenna from a old radio is a better option than the wire antenna.