k1106 fm transmitter kit

4
Doc MS1382 P age 1 Radio microphones are used extensively  by stage performances and by professional eavesdroppers (ie spies), but they do have more mund ane uses a s well. They can be used for any kind of remote monitoring of sounds. For examp le, you can use one to hear your phone or doorbell ringing when you're sitting out in the yard, or to make sure you don't miss a word of you favourite TV programme while you are in the kitchen. They make excellent baby alarms, too, because they can go anywhere the baby goes. Our radio microphone consists of a sim- ple condenser microphone which is used to modify the output of a small radio transmitter. The transmitter radiates a continuous wave whose frequency is altered in sympathy with the sound waves striking the micropho ne. In other words it's an FM (that is, frequency modulated) transmitter. The circuit components have been cho- sen so that the transmitter works in the 88MHz to 108MHZ broadcast band, so you can use an ordinary domestic FM radio receiver to p ick up i ts signals. If you tun e across the FM dial of such a receiver you will find one or more wide gaps where there are no broa dcast signals. If you use a radio microphone only in those parts of the waveband, you will pick up its signals loud and clear and you won't cause any annoying interference to your neighbours. How It Works This circuit is basically an oscillator which runs a t around 1 00MHZ. The most important parts of the oscillator are the transistor Q1 and the tuned circuit, which comprises the inductor L1 and t he variable capacitor CV1. When the battery is first connected, a  brief surge of current flows from the col- lector to the emitter of Q1, causing an oscillating (ie alternating) current to flow  back and forth between L1 and CV1. An oscillating voltage therefore appears at the  junction of L1 and CV1, so that varying the value of CV1 tunes the oscillations so the exact frequency required. The oscillating current would very soon decay to nothing, but for the fact that the oscillating voltage is fed back via C4 to the emitter of Q1 . This makes the base-emitter current of the transistor vary at the oscilla- tion frequency and hence causes the emit- ter-collector current to vary at the same frequency, keeping the current flowing in the tuned circuit and maintaining the oscil- lations. Some of the energy in the o scillat- ing electric and magnetic fields of the tuned circuit is radiated as radio waves. But how do sound waves arriving at the microphone vary the frequency of these waves? They can do this because the fre- quency of the oscillations depends on the TOTAL capacitance in the oscillator cir- cuit. Although CV1 accounts for the major part of this capacitance, other parts of the circuit also make mino r contributions. In particular, the capacitance between the  base and the collec tor of Q1 has a sma ll but noticeable effect on the oscillation frequen- cy. This capacita nce, which is known a s the "junction capacitance", is not fixed but varies when the voltage on the base of the transistor va ries. Sound waves hitting the microphone induces a voltage that varies in time with the sound and this voltage is applied via C1 to the base of Q1, thereby frequency modulating the transmitter. Construction It's absolutely essential to use the board,  because one of the vital components, the inductor L1, is actually part of the PC  board itself. Begin by soldering the resistors onto the  board, refer ring to the diagr am for thei r positions. Next mount the fix ed capacitor s 174 Roe Street, PERT H. Western Australia. 6000 Phone : (08) 9428 2188 Fax: (08) 9428 2187 E-mail: [email protected] u Dealers Throughout Australia FM Radio Microphone Kit There are all k i nds o f use s for thi s am azi ng li tt le mi crop ho ne / tr ansmi tt e r. I t ca n b e bui lt i n ne xt to no ti me and only ne e ds an o rdi na ry FM rad io to d e te c t i ts si gna ls. Reprinted with kind permission of Hobby Electronics Magazine K 1106

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Page 1: K1106 FM Transmitter Kit

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

Page 2: K1106 FM Transmitter Kit

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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.

Page 3: K1106 FM Transmitter Kit

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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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