Circuits & Schematics: Design

1. Designing 1 kW sine wave inverter circuit
   R. V. Dhekale
   Circuits Supply Power Texas Instruments CD4047B
   .. ‘off.’ When a proper load is connected, the inverter will automatically turn on. Sine wave inverter PCB design An actual-size, single-side PCB for the pure sine wave inverter circuit is shown in Figures 5 and 6. Figure ...
   Jun 18, 2025

2. A two-way Wilson current mirror
   Stephen Woodward
   Circuits Analogue Design Texas Instruments LMC555
   .. (5/21/25), I published a Design Idea (DI) describing a bidirectional current mirror using just two transistors and a diode, “A two-way ...
   Jun 12, 2025

3. 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 ...
   Jun 12, 2025
4. Power amplifiers that oscillate - deliberately. Part 1 - A simple start
   Nick Cornford
   Circuits Analogue Design Audio Oscillators NXP TDA7052A TDA7056A TDA7056B
   .. oscillate, the result is often smoke, perhaps with a well-cooked PCB and a side order of fried tweeter. This two-part Design Idea (DI) shows some interesting ways of (mis-)using a common power amp to produce deliberate oscillations of ...
   Jun 12, 2025
5. A two-wire temperature transmitter using an RTD sensor
   Jayapal Ramalingam
   Circuits Analogue Design Measurement Texas Instruments INA122 LM334 XTR116U CD40106B
   .. an analog circuit can be a frustrating experience, as noted by Nick Cornford in his Design Idea (DI), “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the ...
   Jun 11, 2025
6. Circuit controls microneedle etching
   Stephen Woodward
   Circuits Automation Measurement Supply Texas Instruments LM324 LM7812
   .. offset error generally limits sensitivity to input spans no smaller than some hundreds of millivolts. The converter in this design avoids these faults and adds a number of new and useful features. The differential ac signal to be rectified ...
   Jun 9, 2025
7. Build a simple, soft-action muting switch
   John Firestone
   Circuits Audio ON Semiconductor 2N3819
   .. and reduces the LED-current change for less noise (references 1 and 2). References Linkwitz, SJ, “Loudspeaker System Design,” Wireless World, Volume 84, June 1978, pg 67. Self, D, “Inside Mixers,” Wireless World, ...
   Jun 4, 2025
8. Solar power MPPT control Li-ion battery charger
   Manoj Kumar
   Circuits Supply Solar Consonance CN3165
   .. circuit which is there on TP4056. All this packed into a small form factor. PCB layout This is the hardware level design I have implemented keeping all the noise and stabilization problems in mind. Tracks are made with enough ...
   Jun 4, 2025
9. Revisited: Three discretes suffice to interface PWM to switching regulators
   Stephen Woodward
   Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
   .. What if you wouldn’t mind investing a couple more parts to speed it up? Figure 3 shows what. First disclosed in EDN Design Idea (DI), “Cancel PWM DAC ripple with analog subtraction” ( Ref. 1 ), a thrifty way to implement ...
   Jun 2, 2025
10. Precision programmable current sink
    Stephen Woodward
    Circuits Analogue Design Supply Diodes TL431
    .. the 431’s “anode” pin sinks to the same lowly fate. It gets grounded. Current sink regulation The design idea presented here offers that poor persecuted pin a more buoyant role to play, Figure 1. Figure 1. The ...
    May 22, 2025

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