Isolated flyback converters usually evoke thoughts-or bitter memories-of custom transformers, slipped delivery schedules, and agency-approval problems. Off-the-shelf flyback transformers carry isolation ratings of only 300 to 500 V and rarely of as much as 1 kV...
High-isolation converters use off-the-shelf magnetics
80V/100V asynchronous buck converters from Diodes incorporated deliver high efficiency in automotive 48 V PoL applications
Diodes Incorporated introduces four new automotive-compliant asynchronous buck converters for 48 V low-voltage rail point-of-load applications...
25-kV generator tests insulation
To generate high voltages with proper insulation between the “hot node” and the rest of the circuitry, a car ignition coil can function in place of a high-voltage transformer...
Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
Professional condenser microphones require a 48-V supply to charge the internal capacitive transducer and power the internal buffer for the high-impedance transducer output. You can use a simple boost converter, a filter circuit to reduce electromagnetic interference...
Simple changes improve Schmitt trigger
The classical Schmitt trigger circuit that you'll find in textbooks provides some noise immunity, such as for the front end of magnetic pickup in position-sensor circuits...
Why modulate a power amplifier? - and how to do it
We recently saw how certain audio power amplifiers can be used as oscillators. This Design Idea shows how those same parts can be used for simple amplitude modulation, which is trickier than it might seem...
Light an LED without wasting energy
A typical LED-driver circuit uses a transistor to provide current and a series resistor to decrease the voltage you apply to the LED. Unfortunately, the energy (VSOURCE – VDIODE) × IDIODE in a transistor/resistor combination goes to waste...
Matchmaker
Precision-matched resistors, diode pairs, and bridges are generic items. But sometimes an extra critical application with extra tight tolerances (or an extra tight budget) can dictate a little (or a lot) of DIY...
A simulated 100-MHz VFC
Stephen Woodward, a prolific circuit designer with way more than 100 published Design Ideas, had his “80 MHz VFC with prescaler and preaccumulator” published on October 17, 2024...
Holtek new TinyPower low dropout voltage regulators with low quiescent current - HT75Rxx-1 and HT75Rxx-7
Holtek is delighted to announce the release of its new generation of low dropout voltage linear regulators with low quiescent current, the HT75Rxx-1 and HT75Rxx-7 series...