"1. FM Radio Receiver Kit 76MHz-108MHz
Kit Purpose:
1, Suite variety of electronic components: a plurality of electronic components, resistors, capacitors, inductors, diodes, integrated circuits, headphone jack, buttons, etc., many kinds of basic components.
2, learning electronics.
3, practical ability.
4, is particularly suitable for use epoxy PCB welding students use rather than for general use paper-based board!
Frequency range: FM 76-108MHz

Advantages:
Electronic enthusiasts or electronic production of electronic student classes, in particular to optimize the arrangement of the elements according to the beginner, this package easy to manufacture and install a high success rate! As it has been used in many schools, so we know its performance. This kit is not just welding assembly, as well as adjust their own hands and the coiled coil, more fun, this is better than the other simply assembly kit. The main advantage of using the headset also takes into account the student's classroom noise!
Features and use:
FM radio program has a rich, good sound quality, etc.All over launch its own FM radio station. The kit FM scan radio pocket computers using special blocks, 16-pin dual flat package, the working voltage of 1.8-3.6V, the circuit includes a FM radio receiver from antenna to the frequency discriminator output audio signals of all the features, it also has search tuning circuit, the signal detection circuit, a mute circuit and compression frequency offset of the frequency-locked loop FLL circuit. IF frequency of the circuit is designed to 70KHZ, peripheral circuits without intermediate frequency transformer, wherein the frequency is selected by an internal RC circuit IF filter to complete. Aircraft such as digital radio tuner that uses electrical tuning buttons (SEEK +, SEEK-), in addition to the volume control buttons (VOL +, VOL-) and the power button (PW). After the circuit is powered on, press the power button, the circuit starts to work, press SEEK + to search for high-frequency or low-end press SEEK- radio frequency search, automatic search for radio signals, tuning automatically stops, then click on the Search button if The circuit continues to search for radio stations. Frequency range is 76-108MHZ. Both receive Universal FM FM station can be received school campus radio station.

Welding sequence

First welding SMT components, then: 1.resistor 2.Inductor 3.capacitor 4.diode 5.keys 6.headphone jack and switch button.
Electronic kit (complete set of spare parts) for electronic enthusiasts assemble themselves, study electronics knowledge, experience hands-on fun, enjoy the fun of success.
Kit details (schematics, circuit board diagram, parts list, circuit works described assembling step instructions, debugging instructions, etc).If you need,we can send it to you by e-mail.

Package Contents
1x Wireless Stereo FM Radio Receiver Module PCB DIY Electronic Kits 76MHz-108MHz
 
2. 80MHz-108MHz FM Radio
 DIY KITS, need solder yourself
The circuit transmission frequency of about 90MHz,using ordinary FM radio receiving equipment,
adjusting the inductance L to adjust the transmission frequency to avoid the local radio frequency,
the circuit operating voltage: DC 3V-6V,
emitted from the package of about ten to several tens meters,
the distance of the supply voltage, the antenna length and impedance matching,
geographic extent of open, electromagnetic interference, the receiver sensitivity related equipment.
Performance parameters:
Frequency Range: 80MHz-108MHz
Operating voltage: DC3V-6V
TX antenna is connected: You can take a piece of wire as an antenna,
the antenna should not be too long, so as not to affect the frequency stability .
Debugging:
Connect the power and antenna test, the antenna can be used 20-40 cm thick wire
(antenna not too long, so as not to affect the frequency stability),
the package does not provide, you need to bring your own.
FM radio receiving equipment used to adjust the tightness
of the inductor coil on simple wireless microphone,
so the radio signal received by the microphone.
Package including :
R1 resistor 2.2 k 1
R2 resistor 22 k 1
R3 resistance 220 1
C1 C2 ceramics capacitors 104 3
C3 ceramics capacitors 103 1
C6 C7, C4 ceramics capacitors 30 3
C5 ceramics capacitors 10 1
Q triode 9018 1
L inductance 4T 1
1 MIC electret microphone
BT3V CR2032 battery holder 3 v 1
PCB: 26 * 52 mm

3.91-103MHz FM Wireless Radio(Assembled)
Product description:

Operating voltage range [3-5V]

Frequency range [91-103MHZ] (shipping default 3V99.8MHZ)

Transmission range [3-20 m] (the larger environmental influences)

Operating current [6-30mA]

[No antenna (supplied)]

Circuit and illustrating [no]

Frequency regulation [adjustable]

Battery box [no]

Volume adjustment [no]

Interference frequency stability [poor]

MIC sensitivity [0.3 m] speak normally be received

Sound [General]

PCB size] [1.9 * 3.2CM]

Buyers to be equipped [electric iron, battery box and battery, wires, solder wire, 88-108MHZ FM receiver]

Note: This baby is less stable, easy frequency drift, as the industry can not use a wireless transmitter."