imagine of making. The circuit is so simple that it could be finished
assembling within a few minutes and you are already listening your favorite
programs over it.
reception? An antenna stage, a band selector stage, a demodulator stage and a
simple as a piece of cake.
looks pretty ordinary, incorporates all the above stages and thus becomes just
suitable for receiving the radio stations.
here the present design will be capable of receiving only strong stations and
also selectivity might not be very pleasing, typically if there are a couple of
strong stations mingling around the band.
be made, we can clearly see that it just involves a single transistor as the main
collecting or sensing the MW receptions.
capacitor which is connected in parallel to the antenna coil.
which lock on to the received or the resonant frequency at a particular
LC tuned stage is fed to the base of the transistor which as performs the function
of a demodulator as well as a amplifier stage.
sure only the radio information passes to the transistor while the DC component
from the supply is appropriately blocked.
transistor, where the demodulated and amplified signal is applied.
over the headphones with this little “audio marvel”
circuit starts operating with its functions and the switches OFF itself when
the headphone is removed from the circuit. This eliminates the need of an
external switch to be associated with the circuit, making the unit very
The circuit requires just 1.5 V for operating which can be
implemented using a single button type of cell.
You would also want to build this ONE TRANSISTOR FM RADIO CIRCUIT