Universal OPAMP Board for SMD SOT23-5 Package

  • Rajkumar Sharma
  • 393 Views
  • easy
  • Tested

This is easy to build and very useful project for hobbyists and students to learn and create OPAMP-based projects. The project accommodates a single OPAMP in the SOT23-5 package. The project provides the user with multiple choices and extensive flexibility for different applications circuits and configurations. It provides the user with many combinations for various circuit types including active filters, differential amplifiers, and external frequency compensation circuits etc. A few examples of application circuits are given below. LM321 op-amp is the right choice to use for this board or any SOT23-5 OPAMP with the same pin configuration as LM321 can be used. It supports dual supply or single supply, Jumper J1 is provided to use this board with a single supply, D1 power LED.

Note: Refer to example circuit to test the board, it is a bistable multivibrator, with single supply Jumper J1 closed.

Credits: All example schematics are from Analog Devices application notes.

Features

  • Single or Dual Supply User-defined (Jumper)
  • 4 Pin Male Header Connector for inputs
  • 3 Pin Male Header for Supply input (Single or Dual)
  • Jumper J1 Close for single Supply, Open for Dual Supply
  • LED D1 Power LED
  • Any SOT23-5 Op-Amp Can be used Pin configuration – LM321
  • PCB Dimensions 37.31 x 23.50 mm

Other Universal OPAMP boards:

Schematic

Example Application

Parts List

NO.QNTYREF.DESC
11CN14 PIN MALE HEADER PITCH 2.54MM
21CN22 PIN MALE HEADER PITCH 2.54MM
31CN33 PIN MALE HEADER PITCH 2.54MM
426R1,C1,R2,C2,R3,C3USER DEFINED
R4,C4,C5,R6,C6,R7USER DEFINED
R8,C8,R9,R10,R11,R12USER DEFINED
R13,C13,R14,R15,R16,R18USER DEFINED
R5,C7,C14,R19USER DEFINED
52C9,C11CAPACITOR SMD SIZE 1206
62C10,C12CAPACITOR SMD SIZE 0805
71D1LED RED SMD SIZE 0805
81J1PCB SOLDER JUMPER
91R17ALL RESISTORS SIZE 0805
101U1OP-AMP SOT23-5 (LM321)
ALL RESISTORS SMD SIZE 0805OPAMP DIGIKEY# LM321MFX/NOPBCT-ND

Example Application Parts List

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN22 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5315-ND
21CN33 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5316-ND
31C61K PF /50V SMD SIZE 0805MURATA/YAGEO
41C910uF/25V SMD SIZE 1206MURATA/YAGEO
51C100.1uF/50V SMD SIZE 0805MURATA/YAGEO
61D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
71J1CLOSED(PCB JUMPER)PCB SOLDER JUMPER
84R1,R3,R7,R16100K 5% SMD SIZE 0805MURATA/YAGEO
92R8,R90E SMD SIZE 0805MURATA/YAGEO
101R171K 5% SMD SIZE 0805MURATA/YAGEO
111U1LM321TIDIGIKEY LM321MFX/NOPBCT-ND

Example OPAMP Circuits

Gerber View

Photos

Video

LM321 Datasheet

lm321

PCB

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