TECHNICAL SPECIFICATIONS

• Circuit Architecture: Discrete Operational Amplifier (AP2520 Topology)

• Pinout & Footprint: Standard 2520/990 footprint with heavy-duty gold-plated pins

• Input Stage: Matched BC550C low-noise input transistors

• Supply Voltage: ±12 V to ±16 V DC

• Quiescent Current Draw: 35 mA@16 V

• Output Stage: High-current output drive (capable of driving low-impedance output transformers)

• Dimensions: 28 mm x 28 mm (compact square form factor)

• Passive Components: 1% precision capacitors and ultra-low-noise thin-film resistors

DETAILED FEATURES

• Pre-Mounted SMT Components: All intricate surface-mount passive components come pre-soldered to the PCB – eliminating tedious micro-soldering while preserving compact layout advantages

• Matched BC550C Front-End: Hand-matched input transistors deliver outstanding Common Mode Rejection Ratio (CMRR) and thermal stability

• 1% Precision Tolerances: Precision thin-film resistors and 1% capacitors yield lower total harmonic distortion (THD+N) and lower self-noise than traditional carbon-film designs

• High-Current Transformer Drive: Easily drives 2503-style and 1:1 output transformers without bandwidth loss or premature clipping

• Gold-Plated Pins: Ensures maximum conductivity, corrosion resistance, and secure contact in all standard 6-pin DOA sockets

• Universal 2520/990 Footprint: Compatible with a vast array of DIY and commercial gear (Link Audio PI512/PI312, CAPI, API, Hairball, etc.)

WHAT'S INCLUDED IN THE KIT?

This DIY kit contains all necessary parts to complete your discrete op-amp:

• PCB with pre-mounted thin-film SMT resistors and precision capacitors

• Matched BC550C input transistors

• Through-hole power transistors and diodes

• Gold-plated connector pins

(Note: Requires basic soldering skills to attach through-hole transistors and pins to the PCB. Interactive assembly guides are available in our Build Manuals section.)