wireless audio transmitter
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Hey world...
This is a instructable on wireless audio transmitter.In most of our day to day lifewe come across situation where we need a connect ouriPod,mobile,laptop.....etc. to our sound system,but the major limitation is thecable that we need to connect.This probably happens if your sound systemdoesn't have a wireless connectivity option.i too had the same problem so idecided yo solve it...:)Basically its a adjustable FM transmitter that is designed to transmit soundwaves to the radio receiver.We connect the transmitter to our device and use aold phone or FM receiver to connect to our sound system.This might seem oddas we are kinda broadcasting ourself but the range of the transmitter is limitedto 800 meters only.The reason choosing this option is that it is very very CHEAP..!!Also u can connect multiple sound systems at a time without any worries ofsync.Hope this project helps you.!
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Step 1: Electronics You Need
(http://cdn.instructables.com/FB4/2BPN/HXLD5KT6/FB42BPNHXLD5KT6.LARGE.jpg)
About This Instructable
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Scifiswapnil(/member/Scifiswapnil/)swapnil kalhapure(http://scifiswapnil.weebly.com)
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Wireless Audio Transmitter by Scifiswapnil (/member/Scifiswapnil/)
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Parts List :
Resistors :
R1 10k
R2 15k
R3,R4 4k7
R5 68E(68 ohms)
R6 2k2
R7 10E(10 ohms)
Capacitors :
C1 2.2uF/25v
C2,C3 10KpF(103)
C4,C5 10pF
C6,C7 1KpF(102)
Transistors :
Q1 BC548
Q2 C2570
Inductors (air core):
L1 4 turns (22 S.W.G Copper wire)
L2 4 turns (22 S.W.G Copper wire)
L3 6 turns (22 S.W.G Copper wire)
Miscellaneous:
Trimmers 1,2,3 22pf
Antenna 30 cm
MIC (optional) condenser MIC
Audio Jacks:
3.5 mm mono jack
3.5 mm female jack
6.5 mm mono jack (guitar jacks)
6.5 mm female jack
Step 2: Tools You Need
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(http://cdn.instructables.com/FD1/ORHF/HXLD5G2X/FD1ORHFHXLD5G2X.LARGE.jpg)
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Tools :
Soldering iron
Soldering wire
Multimeter
pliers
Wire stripper
Tester
FeviCol
Desoldering pump
PCB hand drill (if needed)
Step 3: Schematics for the Transmitter
The above Image shows the transmitter Schematics you'll need to make thePCB.I have used a black zero PCB i.e. one that is used make a new prototype ;).In the schematic instead of the MIC you can use a Mono jack. The pinouts forthe jack are given above.Its has only two pins GND and Signal.The antenna canbe replaced with a simple wire
(http://cdn.instructables.com/FDD/V606/HXLD50FS/FDDV606HXLD50FS.LARGE.jpg)
(http://cdn.instructables.com/F2R/10F5/HXLD59MO/F2R10F5HXLD59MO.LARGE.jpg)
(http://cdn.instructables.com/F7G/3P5A/HXLD5IEX/F7G3P5AHXLD5IEX.LARGE.jpg)
Step 4: After building the transmitter
You should get this after building the PCB. I've used a plastic box to place thecircuit.The transmitter has a 2 basically a 2 stage transmitter having a V.H.F.oscillator and a R.F. power amplifier.R.F. output power is 100 milliwats.Frequency of the Transmitter can be set with in 88 108 MHz band by adjustingthe first trimmer and also by adjusting the distance between the coil.Adjust theother 2 trimmers for max radiation.Connect a 9 volt battery and thats about it..!
Step 5: Applications
(http://cdn.instructables.com/FX3/ZC1V/HXLD50GD/FX3ZC1VHXLD50GD.LARGE.jpg)
(http://cdn.instructables.com/F09/NKKM/HXLD5KUG/F09NKKMHXLD5KUG.LARGE.jpg)
(http://cdn.instructables.com/FPV/J8SC/HXLD50G3/FPVJ8SCHXLD50G3.LARGE.jpg)
(http://cdn.instructables.com/F6F/6KG6/HXLD50FQ/F6F6KG6HXLD50FQ.LARGE.jpg)
I had small speakers which I've connected to the speakers as radio receiver wecan even use a FM receiver too. The tab is connected to the transmitter . Sonow whatever the tabs audio output is, it is being broadcast and received by thereceivers.Also if you have to many transmitter in the at one place just changethe frequency of the transmitter.Here's a video of that.You can connect multiple sound systems now, by justgetting a new receiver to each sound system.
Step 6: Its done..!!
(http://cdn.instructables.com/FZ7/YF2N/HXLD5M92/FZ7YF2NHXLD5M92.LARGE.jpg)
(http://cdn.instructables.com/FX0/E462/HXLD50FE/FX0E462HXLD50FE.LARGE.jpg)
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(/member/supercapacitor/)
1 year ago Reply
(/member/chandra24/)
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(/member/Scifiswapnil/)
1 year ago Reply
(/member/chandra24/)
1 year ago Reply
Your done and hope fully the R.J. of your area .. ready to rock yourneighbors..!!
Recommended for You
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supercapacitor (/member/supercapacitor/)
Nice build!
chandra24 (/member/chandra24/)
im not getting c2570 transistor so is there any replacement for that which i canuse Atty it's place
Scifiswapnil (/member/Scifiswapnil/) (author) chandra24
try 2SC3512, 2SC2753, 2SC3128.But its moredifficult to get these ic's ...!
chandra24 (/member/chandra24/)
how can we make it a stereo???
Scifiswapnil (/member/Scifiswapnil/) (author) chandra24
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1 year ago Reply
(/member/chandra24/)
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(/member/Hassanul_/)
1 year ago Reply
Thats a good one .. but i think i have a solution....for my solution you'll be needing two such transmitter's and tworeceiver's with some modification..the idea is that ..in mono we send a single signal to the receiver but incase of stereo we need two outputs (the device generates two signals)to be sent...so we'll send those signals on two different carriers andreceive them at two different receivers(on different frequencies) andconnect them to one jack to get a stereo output.See in the image you'llsee the stereo jacks have left and right signals ..
(http://cdn.instructables.com/FTP/8SJP/HXMURLNA/FTP8SJPHXMURLNA.LARGE.jpg)
chandra24 (/member/chandra24/) Scifiswapnil
thanks bro!! I have bought all the parts. and going to make it but i need help so cani get ur fb id or whatsapp no so that i can contact you for help inrealtime.
thanks. my whatsapp no 8126648064
chandra24 (/member/chandra24/)
is it a mono or stereo transmitter???
Hassanul_ (/member/Hassanul_/) chandra24
its mono
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