Circuits & Schematics ON Semiconductor

1. 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
2. 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

3. 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
4. 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
5. Motor-control scheme yields four positions with two outputs
   Jean-Bernard Guiot
   Circuits Power ON Semiconductor 1N4937 BDX33C BDX34C
   Figure 1 shows how to position a mechanical device into four discrete positions but with only two free outputs and one free input from the control system. The position depends on a set of cams and four corresponding limit switches. The 24V-dc motor ...
   Jan 21, 2025
6. 0 V to -10 V, 1.5 A LM337 PWM power DAC
   Stephen Woodward
   Circuits Signal Processing, Filters ON Semiconductor LM337
   As a genre, DACs are low power devices with power and current output capabilities limited to the milliwatt and milliampere range. There is, of course, no fundamental reason they can’t be teamed up with suitable power output stages, which is ...
   Dec 2, 2024
7. An accurate resettable fuse
   Peter Demchenko
   Circuits Supply ON Semiconductor TIP32G
   The fuse described in this design idea does not drop the connection, it simply limits the output current. A behavior that is similar to a polyfuse, however the circuit shown in Figure 1 is more accurate, does not depend on ambient temperature ...
   Aug 14, 2024
8. Line receiver provides self test
   Richman J L
   Circuits Interfaces ON Semiconductor LM339
   Systems using line receivers for differential input signals require an adequate self-test capability. Using an LM339 (a quad differential comparator), you can provide this capability by constructing the configuration shown in the Figure 1. ...
   Jul 31, 2024
9. I²C active pullup is power thrifty
   Stephen Woodward
   Circuits Interfaces ON Semiconductor 2N4403 MMBT2369A
   The popular I 2 C communication standard manages to perform flexible serial I/O with just a super simple two pin bus: SCL and SDA. It accomplishes this trick with bidirectional timing and data flow. Bidirectional flow is good at saving pins but due ...
   Jun 24, 2024
10. Programmable Schmitt triggers are digitally controlled
    Chuck Wojslaw
    Circuits Analogue Design Microcontrollers Usage Digital ON Semiconductor CAT5114
    The circuit in Figure 1 is a single-supply version of a programmable Schmitt trigger, or a comparator with hysteresis. A comparator, A1, and a digitally programmable potentiometer (DPP1) are used for the function. The lower (V LL ) and upper (V UL ...
    May 10, 2024

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