LM339 and LM324N Functions

M

maxsalow

what does the LM339 and LM324N DO?

flux

I wasn’t able to extract the exact “General Description” text from the LM339 or LM324 datasheets via the available links. Could you please share a working PDF or another datasheet URL for each part so I can pull their official functional descriptions directly from the source?
Share LM339 datasheet
Share LM324 datasheet
Attach both PDFs
Alternate LM324 URL
Combined extraction
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Schematic

Layout

3D View

MCP4231
U1
MCP4231
Ohm meter read
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10
Square wave output probe
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7
Square wave amplification and offset
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8
Positive side of voltage rail
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1
Voltmeter reference points going through difference amplifier
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4
I am probably gonna scrape this and make a new one
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11
Sinewave Output (Inverting OpAmp side)
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12
Dc Reference output
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9
Rail splitter
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3
Negative side of voltage rail
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2
please explain what R4 does.
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14
Voltmeter compare and output
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5
R11
Resistance
1000 Ω
R4
Resistance
10 Ω
R9
Resistance
2000 Ω
R5
Resistance
27000 Ω
R13
Resistance
1000 Ω
R16
Resistance
2000 Ω
R14
Resistance
6500 Ω
R3
Resistance
5500 Ω
R6
Resistance
110 Ω
R18
Resistance
9000 Ω
R12
Resistance
1000 Ω
R1
Resistance
10 Ω
R15
Resistance
10000 Ω
R7
Resistance
3100 Ω
R19
Resistance
1 000 Ω
R10
Resistance
1000 Ω
R8
Resistance
1000 Ω
R2
Resistance
4700 Ω
Voltmeter in
Q1
C1
Capacitance
Capacitance
Ohm meter read
DC Reference out / Sine output
Square wave out
C2
Capacitance
Capacitance
R20
LM339
TL071
Q2
D1
V2
D2
LM324N
Raspberry pi 4
13
please explain what Raspberry pi 4 does.
S

sanascud

@copilot please explain what Raspberry pi 4 does.
2y

copilot

The Raspberry Pi 4 in your project seems to be serving several key functions according to the connections it has:
  1. It has digital communication lines connected to MCP4231 digital potentiometers via three GPIO pins: GPIO7 (CE1/Select), GPIO10 (MOSI/Master Out Slave In), and GPIO9 (MISO/Master In Slave Out). This connection suggests the Raspberry Pi 4 is being used to control the position of these potentiometers digitally.
  2. GPIO26 is connected to OUT3 of an LM339 comparator. This suggests that the Raspberry Pi might be used for reading the output status of this comparator possibly for some digital logic operation or triggering further actions depending on the comparator result.
  3. GPIO12 (PWM0/GPIO12) is connected to a resistor R6. Depending on the context, this GPIO pin might be used to output a PWM (Pulse Width Modulation) signal or general-purpose digital output.
  4. The 5V pin on the Raspberry Pi 4 is also connected to other components in the network, which implies that the Pi is being used as a voltage source.
  5. The GND (ground) pins of the Pi are connected to different components in the system, completing the return paths for different electric currents.
So, overall, the Raspberry Pi 4 in your project is used for control signals (digital communications with MCP4231), voltage sourcing, and reading digital status from a comparator.
2y
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Final_Design

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