## Monday, April 3, 2017

### Simple Circuit Schematic Contact Microphone using TL072P IC

Eltronicschool. - A ceramic piezo disc is one kinds of piezo disc that can be used to build contact microphone easily. This is very best choice to build contact microphone using ceramic piezo disc because it is more self-resonant, efficient, and less expensive.

In this time, based on TLo72P IC, we will give you one of electronic circuit schematic of Contact Microphone using TL072P IC like in Figure 1. below.

Circuit Schematic

Component Part
1. KA34063 IC
2. Coil Inductor
3. Resistors
4. LED
5. Diode
6. Capacitors
7. Variable Resistor
Description

Circuit schematic like in Figure 1 above is Contact Microphone using TL072P IC. With this circuit maybe you can look the world with different way. So, you can use the electronic circuit above to build it with simple way.

How it works

According Electroschematics site describe that the signals entering the circuit through the “PIEZO_IN” connector is handled by the first op-amp (IC1A) of IC-TL072P. Choosing the right value for resistor R1 largely depends on your specific application. For example, if you want to catch sub-audio signals, the 10M value is okay. However, if you are more interested in other realms (audio, voice, etc.), start experimenting with resistor values from 10K to 100K. The configuration of the resistor R1 and the potentiometer VR1 is totally up to you as long as R1 is a metal-film resistor (MFR) and VR1 is a logarithmic (LOG) type. The second op-amp (IC1B) wiring includes a small filter and gain adjuster — pretty usable for little signal processing by the end user. Finally, the ac coupling capacitor C5 and the audio output “AMP_OUT” can be extended directly to the outside world.

You can use a single 9-V alkaline battery (or an external dc input up to 15 V) to power your contact microphone by linking the battery [+] to DC-1 and [–] to DC-3 connection points. Note that V+ and V– are the positive and negative rails of the circuit, while GND/0V is the virtual ground used to simulate a dual-rail supply, which does not connect to the negative terminal of the battery (it connects just to the middle of the voltage divider formed by R5 and R6).

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