Circuits & Schematics onsemi

1. A simple, purely analog -130 dB THD sine wave generator
   Christopher Paul
   Circuits Oscillators onsemi NE570 SA571
   The recent Design Idea “Getting an audio signal with a THD 0.0002% made easy” [ 1 ] discloses a low THD sine generator which led me to dust off a design that I had published in AudioXpress magazine [ 2 ] (see Figure 1). Figure 1. A ...
   Mar 7, 2025
2. "Bolt-on" circuit, transistors create zero-drift current source
   Tim Davis
   Circuits Supply onsemi MMBT4401 MMBT4403
   A two-terminal current source using the basic circuit of Figure 1a can be enhanced by adding on an independent subcircuit that uses degeneration of a PNP transistor to achieve zero temperature coefficient (tempco or TC). This low-cost design is the ...
   Nov 30, 2024

3. Efficient digitally regulated bipolar voltage rail booster
   Stephen Woodward
   Circuits Analogue Design Supply onsemi MC74AC132
   The challenge of improving analog/digital accuracy by preventing amplifier saturation in systems supplied with only a single logic-level power rail has been receiving a lot of activity and design creativity recently. Voltage inverters generating ...
   Apr 26, 2024
4. Linear and switcher LED supplies combine, overcome disadvantages of each topology
   Fabien Franc
   Circuits Supply onsemi CAT4101 CAT4201
   To control their brightness, LEDs need a constant current; this can be done with a resistor placed in series with the LED string. Both the LED-string voltage and the supply voltage can vary, so a dedicated LED driver is a must to guarantee the ...
   Dec 28, 2023
5. Circuit senses high-side current
   Jim Hill Robert Bell
   Circuits Measurement Supply onsemi MC33202 MBT3904DW1 MBT3906DW1
   The accurate, high-side, current-sense circuit in Figure 1 does not use a dedicated, isolated supply voltage, as some schemes do. Only the selected transistors limit the common-mode range. The circuit measures the voltage across a small ...
   Aug 21, 2023
6. Method sets voltage in multiple-output converters
   Robert Bell
   Circuits Supply onsemi MC33023 MBR2030CTL MURS120T3
   When you design a transformer for any power converter, you face several compromises. You must trade off core size against the number of primary turns and flux density. Another trade-off is the number of turns and winding resistance versus the ...
   Mar 8, 2023
7. Astable multivibrator gets hysteresis from positive-feedback stage
   Robert Larson
   Circuits Oscillators Digital onsemi MC74VHC04
   Many designs exist for logic-based astable multivibrators, one of the simplest being an RC feedback loop around a single inverting Schmitt trigger inverter (Figure 1). The output charges the capacitor to the upper switching threshold, at which ...
   Jun 27, 2022
8. -50-V, 1-W Power Supply Harnesses Unused µC Pins
   Steve Kendig
   Circuits Supply Microcontrollers Usage onsemi MMBTA42 MURA120
   Why not take advantage of the micro-controller included in many systems these days? This design uses microcontroller feedback to produce a 50-V, 1-W power supply (see Figure 1). It leverages an unused analog-to-digital converter (ADC) input and a ...
   Dec 1, 2021
9. Battery automatic power-off has simpler design
   Yongping Xia
   Circuits Supply onsemi MC14093
   A previous Design Idea describes a simple way to automatically turn off a battery after a preset on period to save battery life ( Reference 1 ). This Design Idea presents a simpler way to perform the same function (Figure 1). Two gates of IC 1 , a ...
   Nov 24, 2021
10. Circuit Forms Random-Bit-Sequence Generator
    Lukasz Sliwczynski Przemyslaw Krehlik
    Circuits Oscillators Measurement onsemi MC10EL16 MC10EL31
    A random-bit-sequence generator is basic equipment for prototyping and testing any data-transmission system. You use such a generator when measuring BER (bit-error rate) and pattern-dependent effects in a transmission system. Such effects can ...
    Oct 13, 2021

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