Tag Archives: preamplifier

Preamp Stage For Ceramic Phono Cartridge Or Violin Pickups

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While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for ceramic phono cartridges. Typically, these were supplied as turnover cartridges in record changers but there were higher quality versions such as the Decca Deram. These… Read more »

Single-Chip VHF RF Preamp

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Here is a high performance RF amplifier for the entire VHF broadcast and PMR band (100-175 MHz) which can be successfully built without any special test equipment. The grounded-gate configuration is inherently stable without any neutralization if appropriate PCB layout techniques are employed. The performance of the amplifier is quite… Read more »

Electric Guitar Preamp, Mixer and Line Driver

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Depending on its design an electric guitar may have anything from one to six pickup elements. Classic (acoustic) guitars could also benefit from one or more retro-fitted pickups. Each pickup has a specific sound depending on the type of sensor and the location on the instrument. When a guitar has… Read more »

The OP27 Fixed Gain Transformerless Microphone Preamplifier Circuit Diagram

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You can see a simple but effective fixed gain transformerless microphone preamplifier circuit diagram in 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 amplifier helps to preserve bandwith because of the high… Read more »

Pre-Amp + Tone Control with TDA1524A

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This is a low noise and distortion pre-amplifier and tone control circuit in one module. Using a special IC TDA1524A, this simple circuit is easy to build and will drive most of power amplifier. Schematic diagram: Component: Resistors: R1, R2__________________ 220R R3, R4__________________ 4K7 R5______________________ 2K2 R6______________________ 1K Capacitors: C1,… Read more »

Portable Mic Pre-amp

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This circuit consume low current supply (about 2mA), so will have a long battery life for supplying the circuit. The circuit built based on a low noise, high gain two stage PNP and NPN transistor amplifier, using DC negative feedback through R6 to stabilize the working conditions quite precisely. Most… Read more »

Simple Microphone Pre-amp

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This Simple preamplifier circuit provides sufficient gain to weak audio signals from the microphone. This circuit can also be supplied from the voltage baterry 3 to 9 volts if necessary. Take a note that the microphone used in this pre-amp circuit is electret type. If you are using high fidelity… Read more »