About the DIY #3
The jaytor DIY Preamp #3 is a high-quality stereo preamplifier designed for DIY enthusiasts. It uses a single Texas Instruments OPA627 precision field-effect transistor (FET) operational amplifier, known for its high accuracy, extremely low input bias current, and very low noise performance. The preamplifier circuitry is mostly contained on one double-sided circuit board with a copper ground plane for ease of construction and optimal performance. Input selection is managed by three high-quality Panasonic TXS2-12V-1 relays per channel, which fully connect or disconnect both positive and negative parts of the signal, ensuring clean signal paths suitable for low-level analog circuits. The power supply uses a low-noise toroidal transformer with a nominal output of 2x 15VRMS at 15VA, though actual voltage can be higher due to the low power demand of the preamp. The design emphasizes sonic purity and reliability, making it a favored project among DIY audio builders.
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