Integrating ADCs that provide accurate results without requiring a precision integrator capacitor has been around for a long time. A venerable example is that multimeter favorite, the dual-slope ADC. That classic topology uses just one integrator ...
Industrial-control circuits often derive their power from widely varying sources that can exceed the 40 V maximum rating of popular switching ICs. This Design Idea presents a simple, flexible, and inexpensive buck switcher that converts an input ...
Analog designers often need matched resistors for their circuits [ 1 ]. The best solution is to buy integrated resistor networks [ 2 ], but what can you do if the parts vendors do not offer the desired values or matching grade? The circuit in ...
The 16-bit DACs are a de facto standard for high DC accuracy and precision domain conversion, but surprisingly few are fully 16-bit (0.0015%) precise. Even when described as “high precision,” some have inaccuracy and integral ...
Stephen Woodward’s DI, “Flip ON Flop OFF” ( Ref, 1 ) does a wonderful job for DC voltages. I thought of extending this idea to much-needed AC voltages, as all our gadgets work with AC voltages. Figure 1 shows the compact circuitry ...
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 ...
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 ...
I recently published a Design Idea (DI) showing some very simple circuits for PWM programming of standard regulator chips, both linear and switching, “Revisited: Three discretes suffice to interface PWM to switching regulators” ( Ref. 1 ...
Some 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. Further, the neutral terminal of the ac source may be unavailable for ...
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, ...