Search Results for: mic preamp diagram

A/B Box Switch 2 Inputs 1 Output with Dual Op-Amps

A/B Box Switch Pedal Circuit

This is a A/B Box switch pedal schematic with two inputs and one output and featured with dual operational amplifier modules. This circuit was designed by Rick Barker. This A/B Box effect was originally designed for switching between different harmonica mics. This A/B Box featured low noise dual preamp for better performance.

2 x 70W Power Stereo Amplifier based on IC STA550

70W Power Stereo Amplifier STA550

Here’s the circuit diagram of a 70W stereo power amplifier which built using single power IC STA550. The circuit is simple and require little additional electronic components to support the work of IC STA550. This power stereo amplifier works with dual polarity / symmetrical power supply. Since based to the datasheet, the negative supply range… Read More »