Power Supplies

2 × single = 1 × dual Schematic Circuit Diagram

Variety of Single Opamps

A wider range of single opamps is accessible compared to their dual or quad counterparts. Occasionally, it can be intriguing to substitute a dual opamp with two equivalent single opamps. This not only provides versatility but also enables the utilization of two distinct opamp types based on the specific application. An instance of this is in the integration of the DAC and output filter within a CD player.

2 × single = 1 × dual Schematic Circuit Diagram 1

2 × single = 1 × dual Schematic Circuit Diagram 2

Selecting Opamps for Specific Applications

In certain scenarios, a dual opamp is employed to serve different purposes. For instance, a fast linear amplifier is necessary for the current-to-voltage converter, while a low-noise opamp is more appropriate for the output filter. Fortunately, it’s relatively straightforward to substitute a dual opamp when using one of the provided printed circuit boards. The schematic outlines the connections between the two single opamps and pin placements within the dual package.

Modification Process and Layout Options

To make the substitution, begin by soldering eight short wire segments to the circuit board in the location designed for the dual package. After installing the single opamps, complete with sockets if desired, solder these wires in place of the dual opamp. Attention to orientation is crucial. Two layout versions are presented: a larger one with improved channel separation, albeit consuming more space, and a more compact alternative. In the case of the larger board, the lead length may need to be reasonably long, depending on the height of surrounding components, slightly elevating the possibility of interference.

Alternative Configuration with Separate PCBs

An additional approach involves two small, independent printed circuit boards, with the ICs mounted back-to-back. However, in this configuration, power supply connections between the two boards are established using wire bridges. Regrettably, the PCB illustrated here is not readily available through the Publishers’ Readers Services.

Understanding Operational Amplifiers (Op-amps)

Operational amplifiers, often referred to as op-amps, are integrated circuits (ICs) designed to amplify the voltage difference between two input terminals. They derive their name from their capacity to perform mathematical operations. In their simplest applications, op-amps function as voltage amplifiers, categorized into noninverting and inverting amplifiers. Noninverting amplifiers, also known as voltage followers or buffers, are commonly utilized. Op-amps can also be employed as differential amplifiers, integrators, and in various other configurations to fulfill diverse tasks.


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