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Limiter Circuits
Last Updated on: Friday, October 03, 2014 10:37 AM


Circuits Designed by Dave Johnson, P.E. :
  • 40KHz Limiting Amp
    This circuit has a gain of X20 at 40KHz.  The amplifier output level is limited to 2.5v peak to peak. Limiting action begins with a 50v peak to peak input.  (added 7/06)
  • Incandescent Lamp Inrush Current Limiter
    This circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 amp, but it could be scaled to any desired current.  (added 7/06)


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
40kHz Limiting Amp -  This circuit has a gain of X20 at 40KHz.  The amplifier output level is limited to 2.5v peak to peak. Limiting action begins with a 50v peak to peak input.  (added 7/06) …. [Designed by David A. Johnson]
Active Power Zener -  Schematic only…. [Tony van Roon's circuit]
Add-On Current Limiter -  This circuit allows you to set a limit on the maximum output current available from your PSU. It's very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you can protect both your power supply - and any device connected to it.....(added 12/2009) [Circuit designed by Ron J.]
Add-On Current Limiter For Your PSU -  This circuit allows you to set a limit on the maximum output current available from your PSU. It's very useful when you power-up a project for the first time, or carry out a soak-test. By setting an upper limit on the current available from your PSU, you can protect.....(Circuit design added 08/08/08)
AN-31 Over Voltage Protection on AC Adapter Input -  Application Note Microsemi 1314 (added 06/07)

Circuit forms high-frequency polarity clamp -  04/11/02 EDN-Design Ideas.....You need a negative signal clamp to protect an ADC against negative-going signals while measuring the positive pulse shape of the signal by digitizing the waveform. In other words, you must clamp negative signals at 0V. The circuit in Figure 1 can clamp either positive or negative pulses to ground..... [Design Idea by Shyam Tiwari, Sensors Technology Private Ltd, Gwallor, India]
Circuit guards amplifier outputs against overvoltage -  5-Jul-07 Issue of EDN  An automotive-protection circuit withstands repeated insults of direct short circuits to the full battery voltage..... [Design Idea by John Guy, Maxim Integrated Products, Sunnyvale, CA]
Circuit limits dV/dt and capacitor inrush at regulator turn on -  11-Oct-07 Issue of EDN  Adding a simple circuit to the adjust pin of a regulator controls the dV/dt of the output voltage, limiting inrush current..... [Design Idea by W Stephen Woodward, Chapel Hill, NC]
Current limit switch is Digitally programmable -  08/17/00 EDN-Design Ideas.Current-limit switches are virtually ubiquitous in system controls. They provide a safe means for regulating the current delivered to a load circuit. The switches allow the load current to increase to a programmed limit but no higher. Typically, the current limit is a  EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Current limiter allows large USB bypass capacitance -  6-Aug-09 Issue of EDN  A current-sense amplifier limits inrush current..... [Design Idea by Daniel Morris, Group IV Technology, Renton, WA]
Current Limiting Bench Power Supply -  This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current.  This is invaluable when (for example) you power-up a ….Circuit design added 08/08/08) [Design by Ron J.]
Current Limiting Resistor Calculator information -  The calculators on this page can be used to find current limiting resistors and currents for Light Emitting Diodes.  The first calculator determines the resistance for a desired LED current while the second calculates the current for a given resistance. [from Rob Paisley's Model Train web site]
Current-Limit Switch Is Digitally Programmable -  Maxim Application Notes / 298 / Dec-04.....[App Note]
Current-Limited DC/DC Converter Simplifies USB Power Supplies -  DN252  Design Notes (Linear Technology) (app note added 2/06)
Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries -  Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see ….....
Dissipation Limiter - This circuit keeps a fixed voltage across a voltage regulator, regardless of load or voltage setting.  It provides most of the efficiency of a SCR regulator and precision of a linear. [Designed by Andrew R. Morris]
Domestic power limit warning -  The circuit was designed to give an audible warning when the 3.3KWh limit is exceeded. The transformer is a disused transformer from a soldering gun. It is relatively easy to remove the few turns of the secondary winding and rewind two turns of thick wire, as thick as the wire coming from the meter at least. One turn should be enough if you have a limit of 6.6KWh, but operation at this power level was not tested. As an alternative you may try a small toroidal mains transformer: it is easy to add a few turns of thick wire.....(circuit added 07/07/07)
Dual Current-Limiting Switch for USB Applications -  Micrel Application Note 32 --  Dual Current-Limiting Switch for USB Applications (app note added 6/06)
Dual Limit Window Comparator  -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
Dynamic Limiter -  ….must register on this site.... [Published in Elecktor July/August 2010]
Hiccup Mode Current Limiting AN-8 -  Application Note 8 from Microsem.....[App Note]
How to build Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries -  Here is a deluxe version of the simple charge rate limiter, using the same idea but with the ability to charge two packs simultaneously from a single wall charger. For circuit description and parts list, see ….....
Incandescent Lamp Inrush Current Limiter -  This circuit limits the large inrush current often associated with large incandescent lamps.  With the components shown the current is limited to 1 amp, but it could be scaled to any desired current.  (added 7/06) …. [Designed by David A. Johnson]
Inrush limiter also provides short-circuit protection -  9-Jun-05 Issue of EDN  MOSFET keeps inrush currents due to capacitive loads under control..... [Design Idea by Ryan Brownlee, Process Automation Division, Pepperl & Fuchs Inc, Twinsburg, OH; Edited by Brad Thompson and Fran Granville]
L200 PSU Regulator Circuit -  easy to power supply with1-single L200 IC, offers a variable current limit of up to2 A, as well as voltage regulation  (added 10/05)
LED-Current Limiting Resistor Calculator -  The calculators on this page can be used to find current limiting resistors and currents for Light Emitting Diodes.  The first calculator determines the resistance for a desired LED current while the second calculates the current for a given resistance. [from Rob Paisley's Model Train web site]
Making the MAX1452/MAX1455 Signal Conditioners Tolerant of Supply Limitations  -  Maxim App Note 4207  -- 3/26/2008 --  (app note add 5/08)
Over Voltage Protection for LM317 -  It is a voltage regulator that allows a 6v portable supply to be derived from the 12v car battery. You can add a 6.2V zener diode and a LED to warn you when the input supply is overvoltage. If you could find a relay that would operate from 6.2v right up to 12v that you could connect in such a way that if over voltage occurred,(added 10/05) [submitted by Adam]
Over Voltage Protection on AC Adapter Input AN-31 -  Application Note 31 from Microsem.....[App Note]
Over/ Under Voltage Cut-Out -  ….(design added 03/08)
Passive circuit limits inrush current -  26-Sep-02 Issue of EDN  You would normally limit the inrush current during start-up of a rectifier circuit with a capacitor output filter by using the circuit in Figure 1. You insert a high resistance in series with the ac input or the dc output of the rectifier and then short-circuit the resistance with a switch once the filter capacitor is sufficiently charged..... [Design Idea by Sunil Tiwari and Mangesh Borage, Centre for Advanced Technology, Indore, India]
Pira CZ Stereo Encoder for FM broADCasting -  This stereo encoder is a halfway between analogue and digital processing. It combines the best from both domains to provide high-quality and easy to build device. The sampling frequency used in this stereo encoder is 97 times….....
Simple & effective inrush current limiter stops surges -  08/02/07 EDN-Design Ideas.....Active circuit and relay replace lossy negative-temperature-coefficient thermistor.… EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.
Simple and effective inrush-current limiter stops surges -  2-Aug-07 Issue of EDN  Active circuit and relay replace lossy negative-temperature-coefficient thermistor..... [Design Idea by Gregory Mirsky, Juno Lighting Group, ModuLight Division, Des Plaines, IL]
Soft Limiter for Oscillator Circuits Uses Emitter Degenerated Differential Pair -  10/12/06 EDN-Design Ideas.....Phase-shift network plus a few active components yields low-distortion output..... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.
Soft Start -  The circuit will limit the current through the supply wires to 5.5A for about 1.5sec. After that time the relay will close and the current flow won't be restricted anymore.  This is a very interesting circuit if you have a large toroid with big electrolytic caps connected to the power supply, since these will act like short circuits for a small amount of time if they start charging. ….(design added 11/08)
Soft-limiter circuit forms basis of simple AM modulator -  3-Sep-07 Issue of EDN  Inserting diodes biased by reference voltages in the feedback loop of an op amp yields a soft limiter that you can use as the basis of an AM modulator..... [Design Idea by Herminio Martínez, Encarna García, and Juan Gámiz, Technical University of Catalonia, Barcelona, Spain]
Stereo BroADCast Limiter -  Circuit for the Ramsey FM10a/FM25 Transmitter (added 5/02)
Stereo Limiter -  Stereo Broadcast Limiter Circuit for Ramsey. ….(electronic schematic added 11/08)

 
 

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