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LM324 circuits | How to | Datasheet | Pinout

Have you ever used an LM324 circuit? We may see them in many circuit diagrams. Because they are operational amplifiers (OP-AMP) that require a battery or single-polarity supply(positive and negative only). In over a very wide voltage range.

In single DIP package have 14 pins and four op-amps inside.

You can use only one of the op-amps or all four.

The current consumption is unaffected by the power supply voltage.

LM324 Pinout

LM324 pinout

You can download more information and simple using of

Feature specifications

  • Wide power supply voltage range: 3V to 30V.
  • Use low power supply current (minimum): 0.8 milliamperes.
  • The normal output current each op-amp (at pin-output to the ground) of: 20 milliamperes typical (10 mA minimum).
  • The output current that flows from the positive supply to output-pin: 8 milliamperes typical (5 mA minimum).
  • The maximum voltage gain (typical): 100,000.
  • Set the gain by setting feedback resistors between output-pin and inverting (-) input.

The application
The LM324 has numerous circuit application. We can use it in many projects.

Learn LM324 circuits recommend

The best learning is doing it. I am slowly learning in anything but when I try to do it I will understand. You may be the same as me.

Increase output current of LM324

When we have low current current output of OP-AMP, so cannot use any circuit output. We can increase OP-AMP output current by this. In circuit the OP-AMP IC-LM324 up current to 85mA size max.


The op amp output current can generally be in the range of 20 to 40mA.
and The LM324 has numerous applications. Quad/ 1MHz/ Operational Amplifiers for Commercial/ Industrial/ and Military Applications. You will build a light meter that uses all four OP-Amps in a LM324 to form a ladder comparator.
But they can provide output current of 20mA only.

With on the LM324 IC number includes 4 OP-Amps. and 3 OP-amp is applied to parallel together. Therefore the output currents up to 85mA, it also has significant short-circuit protection too.

The properties of frequency response time from 0 Hz to 200 KHz, the R1-(10ohm) and C1-(0.01uF) are for control of isolates within, and R is the 10 ohms to control the flow of the op amp for each mean much every op-amp.

1kHz bandpass filter circuit

1kHz bandpass filter circuit using LM324

When you want simple bandpass Filter circuit at Frequency 1KHz. We recommend this circuit. Because it uses LM324 op-amp highly popular.

We can change other frequency with R1, C1, C2, and R2.


OP-amp LED flasher – Oscillator circuits


Op-amp LED flasher - oscillator circuit using LM324
The two LEDs will wink to alternate between a Red LED and a Green LED. At 1 cycle per second. Also, be a Square wave generator circuit. Change frequency by C1.

  1. Fuzz audio converter using LM324
  2. Automatic Battery Charger 6V-12V with Relay cut off by LM324
  3. Separate stereo signal with LM324

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