One-Zener Precise Limiter

A limiter circuit that requires matched zener diodes can instead use one zener with a full-wave diode bridge. The
One-Zener Precise Limiter - schematic

circuit`s two limits are nearly equal when determined by the same zener—only two pairs of forward diodes need to be matched. For best results, an integrated quad of diodes can be used. But, after testing the circuit, four single controlled-drop diodes and four ordinary diodes gave about the same accuracy (better than 0.5%). Because the limiting level can be adjusted, zener tolerance can be adjusted out. Gain stability can be optimized by connecting the inverting input to the first op amp to the output of the second to make the circuit inherently unity-gain. The zener voltage must be increased to 8.2 V to compensate for the two diode drops. Placing small capacitors across the resistors in the loop stabilized the circuit adequately and response is orders of magnitude faster than conventional circuits. Moreover, it`s limited primarily by the op amp`s slew rate.

Recommended videos

  • Current Limited LM2576 Power Supply
    Duration: 20:01.
  • Advent Calendar of Circuits 2011: Day 1: Regulated, Current Limiting Power Supply
    Duration: 5:18.
  • How to Set up and Use a BK Precision Power Supply
    Duration: 6:04.


  • EDN Europe (registration) (blog)
    EDN Europe (registration) (blog) STNRGPF01 is a configurable high-efficiency interleaved power-factor correction controller that STMicroelectronics says can simplify access to digital-power advantages. The SMPS reduces technical challenges an
     24 March 2017
  • WebWire (press release)
    WebWire (press release) Geneva, March 23, 2017 - The STNRGPF01 SMPS (Switched-Mode ) controller from STMicroelectronics delivers the flexibility and high efficiency of digital power without the technical challenges and time to develop custom
     23 March 2017
  • Electronics Weekly (blog)
    Electronics Weekly (blog) Connect the red positive rail to the 5V (pin 27 of the Nano, labelled 5V). This is necessary if you are operating from the USB connector. Connect pin 4 of the Nano (labelled GND) to ... After testing your circuit on
     21 March 2017
  • Electronics Weekly (blog)
    Electronics Weekly (blog) I used a Magnavox AC adapter, but any similar with a DC output from 7.5V to 12V should work. These are readily available online and cost from under $1.00 to about $3.00. Be sure to use two ight LEDs that are ... The
     14 March 2017
  • Dataweek (press release)
    Dataweek (press release) When the input signal applied to a switch exceeds the (VDD or VSS) by more than a diode drop, the ESD protection diodes within the IC become forward biased and current flows from the input signal to the supplies, as
     24 February 2017
  • Electronic Design
    Electronic Design Don't rely solely on electronic of to protect relay contacts. Electronic takes a finite time to react, and decoupling capacitors are often on the output of a . There's nothing better than
     29 September 2016
  • Hackaday
    Hackaday [GreattScott!] combines a few of these into a relatively useful variable with . Admittedly, this is more of academic exercise if your only metric for success is monetary savings. Comparable can be purchased
     12 September 2016
  • Electronic Design
    for Light LoadsWhile these circuits are easy to configure, you should take utmost care to create a bench prototype and add an appropriate filtering and protection circuit to avoid potentially fatal injuries. The user must ensure that the in
     12 September 2016
  • Control Design
    in industrial machineryThis capability may also determine the specified. Some have little current inrush (current overload) capability and other powers supplies have a very high inrush capability, up to 400%. If high inrush
     28 June 2016