The simple FM receiver electronic production


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The simple FM receiver electronic production

Simple FM receiver circuit as shown in figure.

Circuit with four only element, it formed a tiny radio FM receiver, work frequency is stable, transmitting distance is more than 10 meters, 1.5 V power supply, current is less than 0.5 mA. When 3 v power supply, the distance can be up to 30 meters.

 

BG and L and triode junction capacitance component high frequency oscillation circuit triode the junction capacitance about 2 ~ 3 p, want to make frequency fell on FM range, the coil diameter should be in a 5 mm core around 7 laps, capacitor microphone receiver vibration modulation with high frequency signal produce deviation, realize FM. The emission distance and transmitting tube work related to its current, resistance can’t first too big or too small, in 300 ~ 500 Europe between, power less than one milliwatt.

Choose BG, pipe fT must be more than 300 MHZ, such as 2 sc3357 high frequency tube, the frequency is more stable, distance will also further.

Inductance L into two coil to winding, but to around must be the same, L1 with diameter 0.5 mm in diameter wire 5 mm skeleton round 4 turns, L2 around 3 turns.

Antenna can be used 10 cm long flexible conductor, when using hand touch antenna will affect frequency for change. When in the fixed place is very stable. According to drawing fans please must choose good triode, because each only triode of BC knot of the junction capacitance is different, according to the pictures do wireless microphone emission frequency will be in a large frequency range, at any time to mobilize coil spacing, or in BC junction and 5-15 p of small capacitance to debug, the effect is better, are more likely to tune. If you choose the parameter, the microphone a pack good can work normally.

 


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
USD
/pcs
USD
Airmail 25days

pcs
USD
/pcs
USD
Airmail 25days


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