Phono RIAA Preamplifier

The circuit uses one simple, but effective power supply, which is sufficiently shielded by the rest of the circuit, if necessary, with aluminium to prevent noise. The entire circuit can be housed in a small box, from which only the RCA jack, the main power cable at the back, and the Diode Led D1 at the front protrude. It is beneficial to have a fuse and a small switch installed. The signal from the circuit outputs is directed via a quality cable to a free LINE input of an amplifier or preamplifier. If the output signal level is not as desired, the resistors R9-22 can be adjusted to a different value to modify the level.

Additional Content: The circuit is designed with a focus on simplicity and efficiency. The power supply, though simple, is robust and well-protected by the rest of the circuit components. The use of aluminium for shielding is a strategic choice to minimize electrical noise, thus ensuring clean and clear signal transmission. The compact design allows for the entire circuit to be contained within a small box, making it portable and easy to manage.

The RCA jack, the main power cable, and the Diode Led D1 are the only components that extend outside the box. This streamlined design contributes to the circuit's overall neatness and user-friendliness. The inclusion of a fuse provides an additional layer of safety, protecting the circuit from potential overcurrent situations. The small switch adds to the user convenience, allowing for easy operation of the circuit.

The signal from the circuit is directed to an amplifier or preamplifier through a high-quality cable. This ensures minimal loss of signal quality during transmission. The circuit offers flexibility in terms of output signal level. If the user finds the output signal level unsatisfactory, the resistors R9-22 can be replaced with ones of a different value. This feature allows for easy adaptation and customization of the signal level according to user requirements.The circuit use one simple, but good power supply, is enough its armor-clad by the remainder circuit, if it needs, with a aluminium, so that we avoid the noises. All the circuit can be placed in a small box, from which will only come out the RCA jack, the main power cable, in the back box part and the Diode Led D1, in front part.

Good its are placed a Fuse and a good small switch. The signal from the circuit outputs, with a good cable, is led to a free LINE input of amplifier or preamplifier. If the output signal level, is not that we want, we can change the resistors R9-22, with other value so that we adapt the level.

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