This Electric guitar FM transmitter circuit is used to Modify an Acoustic into the electric guitar on FM wireless transmitter system. It is small, cheap, easy to build. The acoustic guitar pickup of this circuit like working with the condenser microphone.
Which is good because This system has less distortion than the general guitar pickup, that includes magnets and coils, may be hard to find and expensive.
The 88 MHz FM transmitter circuit can be listened to with the standard FM radio. This frequency is determined the value of L1 and capacitance between the plate-P1 and guitar strings that is connected to ground through crimping terminal, the capacitance is about 5 pF.
Figure 1 the Electric guitar FM transmitter circuit diagram
When strum Guitar strings to make the capacitance changes. And we connect P1 to L1 as the frequency generator circuit will be FM modulation, send to broadcast transmission on the FM radio.
How to builds
You should assemble the circuit into a small metal box that can tighten the nut mounted CRIMPING TERMINAL fit. And, a metal box with a ground circuit. Next, Connect the cable from P1 should be as short as possible. (See in Figure 2)
Figure 2 How to install the circuit on the guitar.
The parts you need
Q1: 2SC1815, 0.4A 40V NPN transistors
C1: 0.01uF 50V
C2: 0.005uF 50V
0.25W Resistors tolerance: 5%
B1: 9V battery and snap connector
L1: Coil 5 turns of 28 AWG with a inside diameter of about 0.25 inch.
You make the plate from thin sheets of aluminum, wide and 1 cm, length 8 cm. Then, Place under the guitar strings is about 2 mm.
Adjustment and usage
First of all, adjust the frequency of the FM radio to 88 MHz. Second, stretch-shrink L1 while slowly play the guitar until hearing a sound on the radio. Then, close the lid for good. Next, tune the radio to hear a bit more clear as possible. Now, it can play.
If the building has problems “wave away”. You may cut thin metal cover plate over the guitar strings from P1 until carton circuit. Then, fastened to the box lid, to solve the wave crashes. Periodic spread spectrum of about 20 meters.
Also Guitar wireless transmitter
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