When we talk about amplifiers, these are the circuits that convert the lower input signals into a higher level of output signals. And, that’s why they get utilized in almost every other electronic circuit. Amplifiers include voltage amplifiers, current amplifiers, audio amplifiers, etc. Audio amplifiers are essentially used by the mic and the speaker. In other words, it is employed in public addressing systems, concerts, etc.
Thus, In this tutorial, we are going to Make a “Condenser Mic Preamplifier Circuit”. Now coming towards the discussion of preamplifiers, these are generally the very first stage of any amplifier circuit that pickups the very weak signal and amplifies that signal to pass it for further processing. Moreover, it also increases the gain of the circuit.
Hardware Components
The following components are required to make Condenser Mic Preamplifier Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Transistor | BC547 | 1 |
| 2. | Microphone Condenser | – | 1 |
| 3. | Ceramic Capacitor | 0.1uF | 1 |
| 4. | Electrolytic Capacitor | 1uF, 22uF | 3, 1 |
| 5. | Resistor | 1K, 2.2K, 4.7K, 5.6K, 560K, 56 | 1 |
| 6. | 4 Pin Connector | 1 |
BC547 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of BC547
Condenser Mic Preamplifier Circuit
Working Explanation
When you connect the Condenser Mic Preamplifier Circuit and provide any weak audio signal to the microphone, those audio signals touch the diaphragm of that mic attached to the circuit. Now, this triggered the base of the transistor through the base of resistor R2 and capacitor C4. Further, The capacitors C3 and C1 are wired as the filtered capacitor. Since the transistor is connected as the common emitter configuration, therefore the emitter is grounded and output is taken at the collector of the transistor. Hence, the amplified output would be taken through the four-pin connector.
Application and Uses
- Firstly, it is the first stage of audio amplifier circuits.
- Moreover, it enhances the weak signals.
- Further, in the circuits where power amplifiers are there.
- Also, for the progression of other stages in the circuit.
