Negative controlled for LM337
Control negative voltage output using the LM337 IC. Adjustable and stable, ideal for low-power electronics requiring a regulated negative voltage.
adjustable negative regulator
LM337 has a negative controlled circuit, which is used to give out a regulated negative voltage. You can obtain consistent and accurate analog electronics and low-power output by modifying resistors and capacitors.
negative power supply project
LM337 Negative Voltage Regulator Circuit is a low-power electronics project that can enable a stable and adjustable negative voltage output. LM337 is complementary to LM317 and is a regulated negative voltage, usually -1.2V to -37V with external resistors. The voltage divider (two resistors) between the adjust pin and the output is used to adjust the output voltage. At the input and output, filtering and stability are added with the addition of capacitors. In more sophisticated systems, the current-carrying capacity can be expanded with a transistor. This is an appropriate negative voltage supply to be used in op-amp circuits, analog electronics, and dual-polarity power supply projects. With appropriate heat sinking, appropriate operation is guaranteed, particularly when there are increased currents. It is also a low-cost and small-sized LM337 circuit, which is suitable for hobbyists and students studying the fundamentals of voltage regulation.
Work / Installation (Inputs → Outputs)
- Power Input → DC input with voltage slightly higher than desired negative output.
- LM337 Regulator → Adjust pin sets output voltage via voltage divider resistors.
- Filtering → Input and output capacitors reduce ripple and stabilize voltage.
- Optional Transistor → Increases output current capacity if needed.
- Output → Provides stable negative voltage to connected circuit.
- Installation → Assemble on PCB, connect input and load, add heat sink, verify voltage with multimeter, and adjust resistors for desired output.
Testing & Final Adjustments
Once assembled, connect the DC input and output voltage with a multimeter. Adjust the resistor divider voltage to adjust to the negative voltage required. Ripple Check ripple with an oscilloscope, where possible. Care should be taken to ensure that LM337 does not get hot - proper heat sinks are employed. Check connections and polarity to avoid regulator and load damage. In the higher current applications, verify the operation of the transistor and current sharing. After testing, attach to the target electronics, and make sure that the load is not large enough to exceed maximum ratings. Correct testing guarantees stable, accurate, and dependable negative voltages of the analog circuits, op-amp supplies, and other low-power electronics applications.
Frequently Asked Questions - Negative controlled for LM337:
What is LM337?
LM337 is a negative voltage regulator IC providing adjustable output.
What voltage can it provide?
Output ranges from -1.2V to -37V depending on resistors.
Do I need capacitors?
Yes, input and output capacitors improve stability and reduce ripple.
Can I increase current output?
Yes, by adding a transistor to boost current capacity.
Is it suitable for op-amps?
Yes, ideal for dual-polarity or negative voltage supply.
Do I need a heat sink?
Yes, especially for higher currents to prevent overheating.
Can I adjust output voltage?
Yes, using a voltage divider connected to the adjust pin.
Is it beginner-friendly?
Yes, basic electronics knowledge is enough to assemble.
Can it power digital circuits?
Yes, as long as voltage and current ratings are within limits.
Applications?
Op-amp circuits, analog electronics, dual power supplies, hobby projects.
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