microphone preamp Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/microphone-preamp Amplifier Project Schematic Diagram Fri, 23 Dec 2011 21:32:12 +0000 en-US hourly 1 103688205 Mono Preamp based on CMOS IC CD4069 https://amplifiercircuit.net/mono-preamp-based-on-cmos-ic-type-cd4069.html https://amplifiercircuit.net/mono-preamp-based-on-cmos-ic-type-cd4069.html#respond Fri, 18 Nov 2011 06:01:11 +0000 http://amplifiercircuit.net/?p=737 Microphone preamp described here is not a professional preamp, but the original preamp and it is cheap and easy to […]

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]]> Mono preamp based on CMOS ICMicrophone preamp described here is not a professional preamp, but the original preamp and it is cheap and easy to build. Why the original? Because it does not use non-conventional transistors or operational amplifiers (op amps) to amplify the signal from the microphone, but a set of logic gates are commonly used in digital electronics. Digital ICs used are as in the title above which is cmos CD 4049.

As said above, this scheme there are no transistors or components “analog” to ensure amplification of the signal from the microphone. Except for only two logic gates share the work. Microphones, which are provided to capture the sound,
connected to the input of the first logic gate U1: A. This ensures that the amplifier logic gate rate is determined by the value of the resistors R1 and R2. The second logic gate U1: B, in turn, ensures that amplification can be adjusted using potentiometer RV1.

Note: The microphone must be magnetic low impedance (50 ohms and 600 ohms). If your microphone electret type with two legs or three legs, you need to add resistance to power.

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]]> https://amplifiercircuit.net/mono-preamp-based-on-cmos-ic-type-cd4069.html/feed 0 737 Mono Preamp Based on NE5534 https://amplifiercircuit.net/mono-preamp-based-on-a-ne5534.html https://amplifiercircuit.net/mono-preamp-based-on-a-ne5534.html#respond Mon, 24 Oct 2011 02:56:08 +0000 http://amplifiercircuit.net/?p=692 This achievement shows that it is possible to create a balanced dynamic microphone preamp, it is relatively simple. This preamp […]

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]]> Mono preamp based on a NE5534This achievement shows that it is possible to create a balanced dynamic microphone preamp, it is relatively simple. This preamp is particularly suitable for microphones with an output impedance of 200 ohms to 600 ohms. The advantage of the preamplifier is 50 dB, and bandwidth (-3 dB) extends to about 25 KHz. The splitted power supply is required.

The power supply should be treated. It is recommended to use a symmetrical power supply + /-15V using a voltage regulator has less noise, such as the LM317 and LM337.

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