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JC-2 circuit diagram of the front Mark Levisin
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Phono preamp module is a device used to boost the weak analog signal captured from the cartridge (such as the pickup of a record player) to a line-level signal suitable for subsequent audio equipment processing.
Role and Function:
The main role of the phono preamp module is to amplify the low-level, high-impedance signal output from the cartridge to a standard line-level signal level.
It usually includes RIAA (Recording Industry Association of America) equalization circuits to compensate for the frequency response changes introduced by the recording process when recording records.
Technical Parameters:
Gain: Usually has a higher gain to compensate for the low-level signal output by the cartridge. The gain range may vary from product to product, but it is usually sufficient to amplify the cartridge signal to a level suitable for subsequent equipment processing.
Impedance matching: The module will match the impedance of the cartridge to maximize the signal extracted from the cartridge output. Common cartridge impedances include 16Ω, 32Ω, 100Ω, etc.
Frequency response: Includes RIAA equalization to ensure a flat frequency response across the entire audio spectrum.
Noise: A high-quality phono preamp module should have a low noise level to maintain the purity of the music.
Design and Type:
Phono preamp module can be a stand-alone external device or a module integrated into an audio device (such as an amplifier, receiver).
External devices usually offer more options and flexibility, while integrated modules are more convenient and compact.
Market Products:
There are a variety of Phono preamp module products on the market, with different prices and qualities. From affordable entry-level products to professional-level equipment, consumers can choose according to their needs and budget.
Some well-known brands such as NAD, Bellari, etc. offer different levels of Phono preamp module products.
Precautions for use:
When connecting and using a Phono preamp module, ensure that the impedance of the cartridge and subsequent audio equipment is matched.
For different records (such as old records and new records), the gain and equalization settings of the module may need to be adjusted to achieve the best results.
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