Circuits & Schematics: power supply

1. Three parts provide tenfold increase in switcher current
   Wayne Rewinkel
   Circuits Supply Texas Instruments LM2594HV LM2597HV
   .. circuits often derive their power from widely varying sources that can exceed the 40 V maximum rating of popular switching ICs. This Design Idea ...
   Jul 17, 2025

2. Circuits to help verify matched resistors
   Jordan Dimitrov
   Circuits Analogue Design Measurement Texas Instruments LM336-2.5 OPA2197
   .. 1:1 ratio between output voltage and resistor mismatch. A possible drawback is the price: instrumentation amplifiers with a power supply of 5 V and more start at about 6.20 USD. Figure 3 shows another circuit using a dual op-amp, which is ...
   Jul 16, 2025

3. Push ON, push OFF for AC voltages
   Jayapal Ramalingam
   Circuits Digital Texas Instruments CD4024B CD40106B
   .. The relay gets de-energized, and the AC voltage to J2 gets disconnected, making the gadget turn off. R2 and C2 are for the power-on reset of. Figure 2 Circuit switches AC power on and off for output-connected gadgets using a solid-state ...
   Jul 7, 2025
4. 1 amp current injector circuit
   David A. Johnson
   Circuits Measurement Supply Texas Instruments LM385-1.2 LM393 TLC555
   .. electronic circuit injects a precise 1 Amp of current into any unknown resistor, up to about two ohms. Two alkaline C cells power the complete circuit. A voltage booster provides the current control circuit with a higher voltage, to insure ...
   Jun 26, 2025
5. Simple PWM interface can program regulators for V_OUT < V_SENSE
   Stephen Woodward
   Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
   .. in Figure 1; For part values shown A cool feature of the Figure 1 topology is that, unlike some other schemes for digital power supply control, only the precision of R1, R2, and the regulator’s own internal voltage reference ...
   Jun 24, 2025
6. Use a three-phase rectifier and voltage reducer for offline single-phase supplies
   Alberto Abal Pena Carlos Castro-Miguens José Benito Castro-Miguens Marcos Pérez-Suárez
   Circuits Supply Power Diodes TL431
   .. industrial applications require you to feed a low-power dc/dc converter from a three-phase source and possibly to deal with line-to-line voltages of 200 or 400 V rms. ...
   .. which means a higher input voltage. Voltage faults can happen in one or two phases, and some applications require the power supply to keep working despite this problem. To handle these problems, you can use an uncontrolled rectifier and a ...
   Jun 23, 2025
7. Designing 1 kW sine wave inverter circuit
   R. V. Dhekale
   Circuits Supply Power Texas Instruments CD4047B
   .. inverter provides power backup for mains-based appliances in the event of a power failure. Most of the inverters available in the ...
   .. 500 mA due to the 50% duty cycle of the square-wave signal. As the load is increased, current consumption increases. The supply voltage to IC1 is limited to 5.1 volts by using Zener ZD1 and resistor R4 with the external battery. ...
   Jun 18, 2025
8. Power amplifiers that oscillate - deliberately. Part 2 - A crafty conclusion
   Nick Cornford
   Circuits Analogue Design Audio Oscillators Microchip MCP6002 MCP6022
   .. the first part ( Ref. 1 ) of this Design Idea (DI), we saw how to use the TDA7052A (or similar) power amp to build a minimalist siren-type power oscillator, and also, having looked at that device’s ...
   .. respectable, concentrating on minimizing distortion and ignoring the siren song of raw power. We will also stick with a 5-V supply, even though the chip can handle up to 18 V. Figure 1 shows the new circuit. Figure 1. Adding more precise ...
   Jun 12, 2025
9. Power amplifiers that oscillate - deliberately. Part 1 - A simple start
   Nick Cornford
   Circuits Analogue Design Audio Oscillators NXP TDA7052A TDA7056A TDA7056B
   .. audio power amplifiers oscillate, the result is often smoke, perhaps with a well-cooked PCB and a side order of fried ...
   .. an 8 Ω speaker. The square wave produced is somewhat asymmetrical, though good enough for alarm use. Figure 1 shows a 5-V supply. Raising that to 12 V made only one change to the performance: the output became very, very loud. And it drew ...
   Jun 12, 2025
10. Simple, low-voltage charge-pumps. Part 2 - Alternatives
    Rod Elliott
    Circuits Beginners Supply Microchip TC7660 TC7660S
    .. and voltages of 5, 12, 15 and 24 V are common. Manufacturers include AimTec, CUI, Mornsun, Murata, Recom and Traco Power, plus innumerable Asian versions (often without a name printed on the case). If you buy these from eBay, be ...
    .. voltage booster is a 'true' charge pump. When the output of the 555 is low, C4 charges from the supply via D1. When the output goes high, the positive end of C4 is forced high (to +24 V in a perfect world), and ...
    Jun 12, 2025

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