Circuits & Schematics ON Semiconductor

1. Another silly simple precision 0-20mA to 4/20mA converter
   Ashutosh Sapre
   Circuits Analogue Design Measurement Interfaces ON Semiconductor LM337
   A recent Design Idea (DI), “Silly simple precision 0/20 mA to 4/20 mA converter,” ( Ref. 1 ) by prolific DI contributor Stephen Woodward uses the venerable LM337 regulator in a creative configuration along with a few passive components, ...
   Feb 13, 2026
2. Circuit controls inrush current in ac-operated power supplies
   Peter Demchenko
   Circuits Supply Power ON Semiconductor MOC3062M
   Large power supplies that operate from ac wall voltage have large input-filter capacitors. You must limit the inrush current to those capacitors. Otherwise, the supply may trip the ac circuit breaker, or you may damage the rectifier, filer chokes, ...
   Jan 30, 2026

3. Combine two TL431 regulators to make versatile current mirror
   Stephen Woodward
   Circuits Analogue Design Supply ON Semiconductor TL431 TLV431 NJW21193G
   Various designs for current mirror circuits have been an active topic recently here in Design Ideas (DIs). Usually, the mirror designer’s aim is to make the mirror’s input and output currents accurately equal, but Figure 1 shows one ...
   Jan 22, 2026
4. Silly simple precision 0/20 mA to 4/20 mA converter
   Stephen Woodward
   Circuits Analogue Design Measurement Interfaces ON Semiconductor LM337
   This Design Idea (DI) offers an alternative solution for an application borrowed from frequent DI contributor R. Jayapal, presented in: “A 0-20 mA source current to 4-20 mA loop current converter” ( Ref. 1 ). It converts a 0/20 mA ...
   Dec 6, 2025
5. A simpler circuit for characterizing JFETs
   John L. Waugaman
   Circuits Measurement ON Semiconductor MPF102 MPF4392
   The circuit presented by Cor van Rij ( Ref. 1 ) for characterizing JFETs is a clever solution. Noteworthy is the use of a five-pin test socket wired to accommodate all of the possible JFET pinout arrangements. This idea uses that socket arrangement ...
   Nov 26, 2025
6. Low power ozone generator
   Joribo
   Circuits Medicine ON Semiconductor 1N4007 1N5408
   Generating ozone and negative ions in the air can be done by a corona discharge. For this we can use a sharp tip of negative polarity, acting against a flat metal part of positive or neutral potential. The device generates negative air ions and ...
   Nov 12, 2025
7. Build a simple, soft-action muting switch
   John Firestone
   Circuits Audio ON Semiconductor 2N3819
   The circuit in Figure 1 adds a soft muting switch with power-up/power-down muting to a line-level audio circuit. R 4 , C 1 , and JFET Q 1 quietly ground a signal in 100 to 200 msec when you close S 1 or release it when you open S 1 . Potentiometer ...
   Jun 4, 2025
8. Revealing the infrasonic underworld cheaply. Part 2 - Hearing the infrasound
   Nick Cornford
   Circuits Analogue Design Audio Oscillators ON Semiconductor LM385
   In Part 1 of this Design Idea [ 1 ], we saw how a standard electret microphone capsule can be persuaded to detect infrasonic signals down to a fraction of a Hertz by adding some fairly simple equalization. In this second and concluding part, we ...
   May 20, 2025
9. A negative current source with PWM input and LM337 output
   Stephen Woodward
   Circuits Analogue Design Supply ON Semiconductor LM337
   Figure 1’s negative constant current source has been a textbook application for the LM337 regulator forever (or thereabouts). It precisely maintains a constant output current (I OUT ) by forcing the OUTPUT pin to be the negative V ADJ ...
   Apr 18, 2025
10. 1-A, 20-V, PWM-controlled current source
    Stephen Woodward
    Circuits Supply ON Semiconductor LM337
    This design idea (DI) takes an unusual path to a power-handling DAC by merging an upside-down LM337 regulator with a simple (just one generic chip) PWM circuit to make a 20-V, 1-A current source. It’s suitable for magnet driving, battery ...
    Feb 7, 2025

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