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The first was interested in a flexible preamp for use with a high-end acoustic guitar with piezo-electric bridge pickup, and the second wanted a preamp for use with a guitar emulator, to provide add someof the warmth that vacuum valves can provide. Both of....

The YD9088 is a bipolar integrated circuit for use in mono portable and pocket Radios It is used when a minimum of peripheral components (of small dimensions and low costs) is important. The circuit contains a frequency-locked-loop (FLL) system with an....

The G9 project is an adaptation of the Gyratec IX dual microphone/line/DI preamplifier to suit the DIY`ers demands. Searching the net, I`ve never come across a complete tube microphone preamp design, so I decided to share this version of our very popular....

This is high quality Preamplifier circuit with built-in USB DAC for my power amplifier Leachamp. Schematics is from datasheet of PCM2902. Circuit includes DAC and ADC, SPDIF output and input and HID part with 3 buttons for MUTE, VOL + and VOL-. For high....

This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses tw...

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Take a V2-400 and use the sub-woofer amplifier for the center channel. Then add a separate Digital Converter just for the added sub-woofer amplifier and you have the starting of a V5. 1. Next, put all the preamplifiers in the sub-woofer box and make a....

This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more....

Since modern sound systems usually lack inputs for record players, separate MD preampliers are becoming increasingly popular. They are needed not only by people who still regularly like to listen to vinyl records, but also by those who want tonally....

This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage required is 1 to 12 volts and can be obtained from a 10k potentiometer....

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This LM12 audio amplifier circuit will provide a high output power on a 8 ohms or 4 ohms load impedance. The maximum output power delivered by this LM12 audio amplifier is around 60 watts on a 4 ohms load and 100 watts on a 4 ohms load on each channel. A....

This is a low cost FM booster circuit to receive far away fm stations clearly on your radio in your local area. The circuit diagram of FM booster consist of a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. The output of the....

The microphone preamplifier circuit design presented in this schematic use SSM2015 produced by Precision Monolithics Inc. (PMI) which offers a high amplifi...

high quality amplifier for headphones electronics project. no need for preamplifier. circuit diagram...

6DJ8 / ECC88 Symmetrical SRPP Tube Preamplifier Schematic. Gain of the preamp is 27 dB (about 23.5 times)...

The SDR hardware in its simplest form consists of a wideband switched balanced mixer and low noise LF amplifier. This simple hardware has an amazing sensitivity and linearity which is sufficient for test and even regular use. Here are some of the problems in....

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This Hi Fi stereo preamplifier circuit is congenital with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL amalgamation and integrates 2 abstracted preamp circuits. It is a low babble preamp with little or no botheration in the building process. The aboriginal....

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The first part of the circuit here is a preamplifier consisting of transistor Q1(2N2222). The collector of the Q3 is coupled to the base of Q2 (2N2905A), which forms a complementary symmetry pair with Q3 (2N3053). The amplified signal is available at the....

The circuit given here is of a three input mic mixer cum preamplifier using the IC LM348. The LM348 is a high gain, internally compensated quad operational amplifier with a class AB output stage. The IC has very low input supply current drain (0. 6mA/ opamp)....

This electronic project is a simple microphone preamplifier based on the LM318 op amp. The LM318 op amp is operated as a standard non-inverting amplifier. Resistor R1 provides an input path to ground for the bias current of the non-inverting input. The....

Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find but BC549C or BC109C are a good replacement. The circuit is self stabilizing and will set its....

It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resistor R1 provi..

The circuit was designed to create a modular Class A buffer preamplifier in order to isolate stages in an audio circuit. BF245 a general purpose N-Chann....

This is an intercom circuit which use LM380 as the audio amplifier and 2 transistors as the microphone pre amplifier. The sound quality will be good enough with low cost building. This circuit consists of two identical intercom units. Each unit contains a....

High Quality very simple unit, No need for a preamplifier Amplifier parts: P1 = 22K R1 = 1K R2 = 4K7 R3 = 100R R4 = 4K7 R5 = 82K R6 = 10R-1/2W R7 = 22R R8....

This is a low cost, antenna-mounted, this UHF TV pre-amplifier circuit can add more than 25db of gain. The first stage of the pre-amplifier is biased from optimum gain. L1, L2 strip line equivalent with Lambda/8 of PC board. An RF power amplifier is a type....

This is a symmetrical amplification unit circuit, more composed, modified by a construction which was proposed some years ago by Lisley Hood. The most important reason is to get the right transistor FET at differential amplifier at input. In spite of all....

A simple but effective fixed gain transformerless microphonepreamplifier circuit diagramin the picure below. The circuit amplifies differential signals from low impedance microphones by 50 dB and has an input impedance of 2 kOhms. The OP27/37 operational....