Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs

1. A pot of many colors
   Nick Cornford
   Circuits Analogue Design Microchip MCP6002
   .. pair to drive not just two but three LEDs. As everyone knows, rainbows always have pots of gold at their ends. This Design Idea reverses that, starting with a pot (no gold, alas) and ending with a rainbow. Bi-color LEDs can be ...
   Jun 24, 2026

2. 4-20mA to 0-20mA converter sips mere microamps
   Stephen Woodward
   Circuits Analogue Design Interfaces Diodes AP4310A
   .. like TO220 packaged power pass transistors sporting substantial heatsinks. Would Greta T. approve? I think not!7 The design in Figure 1 offers a cool (and maybe even useful) efficiency improvement. It thriftily recycles most of the 4 ...
   Jun 23, 2026
3. 4mA-20mA to 0mA-20mA converter's current mirror drives grounded load
   Stephen Woodward
   Circuits Analogue Design Interfaces Texas Instruments TLV197-Q1 TLV431
   .. V REF input of Z1. The principle in play is discussed here ( Ref. 1 ). A potentially annoying shortcoming of the Figure 1 design, however, is its current sink output that’s referred not to ground but to the V+ source node, which ...
   Jun 15, 2026
4. Dual-fan PWM cooling circuit with a 6W isolated flyback power supply
   Hesam Moshiri
   Circuits Supply Microcontrollers Usage Atmel ATtiny13
   .. project presents the design and implementation of a dual-fan PWM cooling circuit, integrating a compact and efficient power supply with ...
   Jun 15, 2026
5. Zener test circuit serves as DC source
   John Jardine
   Circuits Measurement Supply Texas Instruments SN74HC132
   .. Design Idea describes a versatile test circuit for zener diodes after yet another misread zener diode had ...
   Jun 8, 2026
6. Triply simply sequence supply voltages
   Stephen Woodward
   Circuits Supply Texas Instruments CD40106B
   .. circuit design for power supply on/off sequencing uses Schmidt triggers for triple-positive-rail timing purposes. Recent ...
   Jun 4, 2026
7. 4/20mA to 0/20mA loop current converter for grounded loads
   Jayapal Ramalingam
   Circuits Analogue Design Measurement Interfaces STMicroelectronics LM124
   .. common in industry. This circuit implements current loop conversions for them. Recently, there have been several published Design Ideas on converting 0/20 mA to 4/20 mA current and 4/20 mA to 0/20 mA current as full-circle current loop ...
   May 25, 2026
8. Triple-duty current loop calibrator
   Stephen Woodward
   Circuits Measurement Interfaces ON Semiconductor LM337
   .. to 4/20mA converter. Woodward, Stephen. Double-duty current loop transmitter. Ramalingam, Jayapal. Linearly variable two-wire loop current generator. Materials on the topic Datasheet ON Semiconductor LM337
   .. always gratifying when a simple and successful design idea luckily turns out to have additional applications that you didn’t originally envision. ...
   May 21, 2026
9. 30A AC soft starter (inrush current limiter)
   Hesam Moshiri
   Circuits Arduino Supply Microcontrollers Usage Atmel ATtiny13
   .. C7 are output capacitors to stabilize the regulator output voltage and reduce the noise. NTC is a 2 Pins XH connector to wire a 10K NTC to the board. R6 and NTC build a voltage divider, where voltage variations indicate changes in the ...
   .. current flow, ensuring a smooth and efficient start-up, while protecting your equipment from damage. So I decided to design this AC soft starter that is equipped with a fail-safe mechanism. During start-up, the inrush current passes ...
   May 20, 2026
10. ΔVbe thermometer is switchable between °C and °F
    Stephen Woodward
    Circuits Measurement Texas Instruments CD4073B
    .. significantly affecting temperature measurement accuracy. V+ can likewise wander harmlessly from 7 to 20 volts. A simple 9 volt battery will therefore work well and, since the total current draw is less than 2 mA, will last for hundreds of ...
    .. small signal BJTs can function in simple circuits as 0.1% precision absolute temperature sensors, as shown in an earlier Design Idea ( Ref. 1 ). The ΔVbe effect depends solely on the ratio of applied currents, independent of their ...
    May 14, 2026

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