Circuits & Schematics Texas Instruments

1. +5V powered charge pump battery charger
   David A. Johnson
   Circuits Supply Texas Instruments SN74HC14
   The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5 v available a USB connection and pumps about 70 mA of current into the battery. This should be enough current to fully charge ...
   Jun 30, 2025
2. 1 amp current injector circuit
   David A. Johnson
   Circuits Measurement Supply Texas Instruments LM385-1.2 LM393 TLC555
   I designed and built this thing many years ago. I published the hobby circuit in the now defunct “Radio Elecronics” magazine back in 1992. The electronic circuit injects a precise 1 Amp of current into any unknown resistor, up to about ...
   Jun 26, 2025

3. Designing 1 kW sine wave inverter circuit
   R. V. Dhekale
   Circuits Supply Power Texas Instruments CD4047B
   An inverter provides power backup for mains-based appliances in the event of a power failure. Most of the inverters available in the market have complicated circuit designs and are not very economical. Some of them produce a square-wave output, ...
   Jun 18, 2025
4. A two-way Wilson current mirror
   Stephen Woodward
   Circuits Analogue Design Texas Instruments LMC555
   Recently (5/21/25), I published a Design Idea (DI) describing a bidirectional current mirror using just two transistors and a diode, “A two-way mirror current mirror that is” ( Ref. 1 ). That circuit works well in some applications, ...
   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
   Designing 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 design of 4 mA to 20 mA, two-wire ...
   Jun 11, 2025
6. Circuit controls microneedle etching
   Stephen Woodward
   Circuits Automation Measurement Supply Texas Instruments LM324 LM7812
   At its invention roughly four decades ago, STM (scanning tunneling microscopy) created a sensation because it was the first technology to make atomic-scale-resolution imaging a routine procedure. An essential requirement for the practical ...
   Jun 9, 2025
7. Revisited: Three discretes suffice to interface PWM to switching regulators
   Stephen Woodward
   Circuits Supply Microcontrollers Usage Texas Instruments TPS62933
   The typical regulator output network Many voltage regulator chips, both linear and switching, use the same basic two-resistor network for output voltage programming. Figure 1 illustrates this feature in a typical switching (buck type) regulator, ...
   Jun 2, 2025
8. A single op-amp solution to stabilize laser output
   Anirban Chatterjee
   Circuits Laser Microcontrollers Usage Texas Instruments OPA551
   Semiconductor laser diodes (SLDs) are often packaged with a photodiode. The output current from this photodiode can be monitored to regulate the output power intensity of the laser diode. SLDs, however, are prone to pathological drifts, such as ...
   May 29, 2025
9. A two-way mirror - current mirror that is
   Stephen Woodward
   Circuits Analogue Design Oscillators Texas Instruments LMC555
   One classic set you’ll see in most гvintage mystery movies is an interrogation room with a “two-way” mirror in one wall. This cool gadget lets the witnesses see the suspects from another room while the suspects can see only ...
   May 22, 2025
10. Seven-octave linear-in-pitch VCO
    Stephen Woodward
    Circuits Oscillators Texas Instruments LMC555 SN74HCT74
    Frequent contributor Nick Cornford recently shared design ideas incorporating cool circuits for linear-in-pitch voltage-controlled oscillators (LPVCOs): Revealing the infrasonic underworld cheaply: Part 1 ( Ref. 1 ) and Part 2 ( Ref. 2 ) A ...
    May 21, 2025

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