UNI-OPAMP-04

8 opamp, SMT version

Features

• Universal OpAmp Board
  • Configurable through stuffing options for typical OpAmp circuits
  • Through hole parts
  • 14 pin DIP
  • 1/8 or 1/4W resistors
• 4 Channels, 1 Quad OpAmp
  • LM324, MCP6004, NJM2060
• Individual input and output headers per channel
• Terminal block or header for power
• Bypass capacitors
• 59X49mm form factor
• (4) 4-40 mounting holes

Typical OpAmps

Part	LM324	MCP6004	NJM2060
Operating Voltage	3 to 30V	1.8V to 6V	+/-4 to +/-18V
GBW Product	1.2 MHz	1 MHz	10 MHz
Output Current (mA)	10mA	23mA	25mA
Offset Voltage (max)	7mV	4.5mV	6mV

Connectors

J1-J4 - Inputs

• Pinout

1. Opamp + input
2. Opamp - input
3. GND

• J1 - CH 1
• J2 - CH 2
• J3 - CH 3
• J4 - CH 4

J5-J8 - Outputs

• Pinouts

1. Opamp Out
2. GND

• J5 - CH 1
• J6 - CH 2
• J7 - CH 3
• J8 - CH 4

Configurations

• The reference designs (below) are for the first channel.

• The resistor mapping from the first channel on the schematic to the other channels are as follows.

Resistor Stuffing by Channel

OpAmp	Ax-/Ix-	Ax+/Ix+	Ax-/Qx	Ax-/GND	Ax+/GND	Ax+/VCC
U1A	R3	R5	R1	R2	R4	R6
U1B	R10	R9	R12	R11	R7	R8
U1C	R22	R19	R24	R23	R21	R20
U1D	R15	R17	R13	R14	R16	R18

Reference Designs

• Reference drawings are from TI Ap Note 31 - Op Amp Circuit Collection
• Reference designators are for channel 1
  • See resistor values table (above) schematic for other channels

Differential Amplifier

Differential Amplifier - Reference Design (AN31)

Differential Amplifier Stuffing Options

Current to Voltage Converter

Current to Voltage Converter - Reference Design (AN31)

Current to Voltage Stuffing Options

Inverting Amplifier

Inverting Amplifier - Reference Design (AN31)

Inverting Amplifier Stuffing Options

Non-inverting Amplifier

Non-inverting Amplifier - Reference Design (AN31)

Non-inverting Stuffing Options

Schematic

• Schematic

Single Channel Schematic (Editable)

U1 Part A Schematic

U1 Part B Schematic

U1 Part C Schematic

U1 Part D Schematic

Test

Measure OpAmp Input offset voltages

• From Test Op Amps Via Simple Input Offset Voltage Measurement
• DPS3005 Power Supply
  • 0.1A current limit
  • Use built in current meter to measure power supply current
• Measure using DMM Extec EX330
  • 0.1 mV resolution
• Pick off split voltage at R8 (not power side)
• 12V for LM324NE3, NJM2080D
• 5V for MCP6004-E/IP
• Jumpers between + inputs

Voltage Offset Measurements

• Parts purchased from Mouser 2022-Aug

• LM324N
  • Channel A, 0.7mV
  • Channel B, 0.3mV
  • Channel C, 0.5mV
  • Channel D, 0.5mV
  • Vcc = 12V
  • Icc = 1mA
• NJM2080D
  • Channel A, 0.2mV
  • Channel B, 0.4mV
  • Channel C, 0.7mV
  • Channel D, 0.6mV
  • Vcc = 12V
  • Icc = 8mA
• MCP6004
  • Channel A, <0.1mV
  • Channel B, 0.8mV
  • Channel C, 1.3mV
  • Channel D, 1.1mV
  • Vcc = 5V
  • Icc = 1mA

Mechanicals

Videos

• IMSAIGuy OpAmp videos playlist

Assembly Sheet

• UNI-OPAMP-04 Rev 1 Assembly Sheet