Amplifier Circuit Diagrams

Simple MD Cartridge Preamplifier Schematic Circuit Diagram

Phonographs are gradually becoming a rarity. Most of them have had to yield to more advanced systems, such as CD players and recorders or (portable) MiniDisc player/recorders. This trend is recognized by manufacturers of audio installations, which means that the traditional phono input is missing on increasingly more systems. Hi-fi enthusiasts who want to make digital versions of their existing collections of phonograph records on a CD or MD discover that it is no longer possible to connect a phonograph to the system.

Simple MD Cartridge Preamplifier Schematic Circuit Diagram

However, with a limited amount of circuitry, it is possible to adapt the line input of a modern amplifier or recorder so that it can handle the low-level signals generated by the magneto dynamic cartridge of a phonograph. Of course, the circuit has to provide the well-known RIAA correction that must be used with these cartridges. The preamplifier shown here performs the job using only one opamp, four resistors, and four capacitors. For a stereo version, you will naturally need two of everything. Any stabilized power supply that can deliver ±15 V can be used as a power source.

An operational amplifier is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op-amp produces an output potential that is typically 100,000 times larger than the potential difference between its input terminals.
In the most basic circuit, op-amps are used as voltage amplifiers, which can be broadly divided into noninverting and inverting amplifiers. Voltage followers (also simply called buffers) are a type of commonly used noninverting amplifiers. Op-amps are also used as differential amplifiers, integrator circuits, etc.  An operational amplifier has two input pins and one output pin. Its basic role is to amplify and output the voltage difference between the two input pins. 
Amplifiers can be either electronic or mechanical in common definition whereas operational amplifiers are electronic amplifiers. Amplifiers, in general, have a limited capability of amplifying DC signals but all op-amps are capable of amplifying DC signals.
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