k1106 fm transmitter kit
TRANSCRIPT
7/27/2019 K1106 FM Transmitter Kit
http://slidepdf.com/reader/full/k1106-fm-transmitter-kit 1/3Doc MS1382
Page 1
Radio microphones are used extensively by stage performances and by professionaleavesdroppers (ie spies), but they do havemore mundane uses as well. They can beused for any kind of remote monitoring of sounds. For example, you can use one tohear your phone or doorbell ringing whenyou're sitting out in the yard, or to makesure you don't miss a word of youfavourite TV programme while you are inthe kitchen. They make excellent babyalarms, too, because they can go anywherethe baby goes.
Our radio microphone consists of a sim-ple condenser microphone which is usedto modify the output of a small radiotransmitter. The transmitter radiates acontinuous wave whose frequency isaltered in sympathy with the sound wavesstriking the microphone. In other wordsit's an FM (that is, frequency modulated)transmitter.
The circuit components have been cho-sen so that the transmitter works in the88MHz to 108MHZ broadcast band, so youcan use an ordinary domestic FM radioreceiver to pick up its signals. If you tuneacross the FM dial of such a receiver youwill find one or more wide gaps wherethere are no broadcast signals. If you use a
radio microphone only in those parts of the waveband, you will pick up its signalsloud and clear and you won't cause anyannoying interference to your neighbours.
How It WorksThis circuit is basically an oscillator
which runs at around 100MHZ. The mostimportant parts of the oscillator are thetransistor Q1 and the tuned circuit, whichcomprises the inductor L1 and the variablecapacitor CV1.
When the battery is first connected, a brief surge of current flows from the col-lector to the emitter of Q1, causing anoscillating (ie alternating) current to flow back and forth between L1 and CV1. Anoscillating voltage therefore appears at the junction of L1 and CV1, so that varying thevalue of CV1 tunes the oscillations so theexact frequency required.
The oscillating current would very soondecay to nothing, but for the fact that theoscillating voltage is fed back via C4 to theemitter of Q1. This makes the base-emittercurrent of the transistor vary at the oscilla-tion frequency and hence causes the emit-
ter-collector current to vary at the samefrequency, keeping the current flowing inthe tuned circuit and maintaining the oscil-lations. Some of the energy in the oscillat-
ing electric and magnetic fields of thetuned circuit is radiated as radio waves.
But how do sound waves arriving at themicrophone vary the frequency of thesewaves? They can do this because the fre-quency of the oscillations depends on theTOTAL capacitance in the oscillator cir-cuit. Although CV1 accounts for the majorpart of this capacitance, other parts of thecircuit also make minor contributions. Inparticular, the capacitance between the base and the collector of Q1 has a small butnoticeable effect on the oscillation frequen-
cy. This capacitance, which is known asthe "junction capacitance", is not fixed butvaries when the voltage on the base of thetransistor varies. Sound waves hitting themicrophone induces a voltage that variesin time with the sound and this voltage isapplied via C1 to the base of Q1, therebyfrequency modulating the transmitter.
Construction
It's absolutely essential to use the board, because one of the vital components, theinductor L1, is actually part of the PC board itself.
Begin by soldering the resistors onto the board, referring to the diagram for theirpositions. Next mount the fixed capacitors
174 Roe Street, PERTH.Western Australia. 6000Phone: (08) 9428 2188Fax: (08) 9428 2187E-mail: [email protected] Throughout Australia
FM RadioMicrophone Kit
There are al l ki nds of uses for t hi s amazing
l i t t l e mi crophone / transmi t t er. I t can be
buil t i n next t o no t ime and only needs an
ordi nary FM radio t o det ect i t s si gnals.
Reprinted with kind permission of Hobby ElectronicsMagazine
K 1106
7/27/2019 K1106 FM Transmitter Kit
http://slidepdf.com/reader/full/k1106-fm-transmitter-kit 2/3
(C1, C2, C3 and C4), taking care that C1,the electrolytic or tantalum capacitor, isinserted the right way round.
That leaves only two components to bemounted on the board. The variablecapacitor, CV1, shouldn't present anyproblems, because it can go either way
round, but the transistor Q1 must be ori-ented correctly.
Since this is intended to be a short rangetransmitter, only a small antenna is neces-sary. Excellent results were obtained withan antenna about 12 cm long, made from apiece of hookup wire soldered onto the PC board at point A on the diagram. Longerantennas will increase the range consider-ably, with the best range being achievedwith an antenna about 750 mm long.However, apart from being unwieldy,such an antenna is too powerful, and may
begin to interfere with other users of theairwaves.
Once the PC board is finished, you canconnect up the external components.
If you are going to house the completeunit into a box and this applies in particu-lar to metal boxes make sure that theantenna is not inside as it will not radiatevery well, causing poor reception.
Setting UpTune your radio receiver to a point on
the FM dial where there are no broadcast
stations close by. With the radio micro-
phone fairly lose to your receiver andturned on, use a small screwdriver toadjust the variable capacitor CV1. At somepoint you should hear a terrible "howl"through the receiver. The radio mic is nowtransmitting on the same frequency thatyour receiver is turned to, and is causingacoustic feedback because it is too close tothe loudspeaker. So turn the receiver off,leave CV1 set in the same position andmove the receiver away from the micro-phone. Now turn your receiver on againand get a friend to speak at the micro-phone. For complete clarity you may needto alter the tuning of your receiver slightly.
The unit consumes power all the time it
is on, whether there is any sound beingtransmitted or not, so batteries don't lasttoo long. You can expect a small 9 volt battery last about ten hours. Use a bigger battery or a 9 volt power supply if youwant continuous use for longer periods.
A l t roni cs K 1106 FM Radi o M i crophone K i t
Page 2 Doc MS1382
Fig.2. The overlay f or t he Radio M icrophone. Take care w it h the orientat ion of the
pol ari sed component s such as the t ransi stor , t he mi crophone and the capacit ors.
C 0170 Mic InsertConnections
PositiveMetalTag
(GND)
Negative
Fig.1. The connecti ons for t he el ectr et
mic i nsert . Solder t he negati ve
terminal and the met al t ag together.
Resistor Colour Codes
Value Code100Ω brown black brown gold12kΩ brown red orange gold27kΩ red violet orange gold56kΩ green blue orange gold
Capacitor Codes
Value Code
1µF 35V Tantalum 105470pF Ceramic 4717 pF Ceramic 7 Fig.3. The circuit diagram for t he Radio M icrophone. Not t hat L 1 is etched onto t he
board as a coil of copper t rack.
7/27/2019 K1106 FM Transmitter Kit
http://slidepdf.com/reader/full/k1106-fm-transmitter-kit 3/3
Page 3 Doc MS1382
Al t roni cs K 1106 FM Radi o M i crophone K i t
Parts ListResistors all 1/2W, 5%1 27k (R1)
1 56K (R2)
1 12K (R3)1 100R (R4)
Capacitors
1 1u, 16V electrolytic or tantalum (C1)
2 470p ceramic (C2, C3)
1 6p8 ceramic (C4)
1 30p trimmer cap (CV1)
Semiconductor
1 BC108, BC548 or similar (Q1)
Miscellaneous
1 PCB Code HE1106
Solder, light duty hookup wire.
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Dear Kit Constructor,
At Altronics we take great pride in the qualityand presentation of our kits. If you find anydeficiency in this kit or have any constructivecomments whatsoever, please write to us.
AltronicsAttention: The Kit Manager
P.O. Box 8350,Perth Business Centre
W.A. 6849
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Important Note:Please note that we can offer a warranty only on the componentssupplied with this kit. Because we are unable to guarantee yourlabour, there is no warranty on either partially or fully built kits.
We are able to offer a repair service, but once construction hascommenced, this service is chargeable.
This Kit Contains Static
Sensitive Devices
Some components contained in this kit are static sensitivedevices. Use antistatic precautions as these devices canbe degraded or destroyed by static discharge. We
recommend you use a wrist strap and make sure thesoldering iron tip is earthed. Also work on a surface that isnot susceptible to static charge such as a proper static mator wood surface. Try to avoid melamine or plastic surfaces
as these can hold a static charge.
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