TLV9061: Low Side Current Sink Op-Amp Output Voltage is Higher than expected when input is 0V, Causing LED glow - Amplifiers forum - Amplifiers - TI E2E support forums
Amazon.com: NE5532 Audio OP AMP Moving Coil Microphone Preamps Pre-Amplifier Pre-amp Magnetic Head Phono Amplifier Board DC9-24V AC8-16V : Electronics
Simple 0-24V/5Amp Variable Power Supply Circuit with Transistors