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Self-oscillating sawtooth generator spans 5 decades of frequencies
There are many ways of generating analog sawtooth waveforms with oscillating circuits. Here’s a method that employs a single supply voltage rail to produce a buffered signal whose frequency can be varied over a range from 10Hz to 1MHz (Figure 1). Figure 1 The sawtooth output waveform is the signal “saw” available at the output […]
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Reducing Certification Risk at the Design Stage Hazardous Environments
Hazardous-area electronics demand high reliability, but traditional wired approaches often deliver it at significant cost and complexity. WirelessHART, an industrial wireless standard for low-power, highly reliable communication in harsh environments, reduces wiring through a self-healing mesh network while maintaining robust performance. The appeal is clear, but designing and certifying WirelessHART devices for ATEX-rated environments introduces technical and […]
Simplifying inductive wireless charging
What do e-bikes and laptops have in common? Both can be wirelessly charged by induction. E-bikes and laptops both use lithium-ion batteries for power, chosen for their light weight, high energy density, and long lifespan. Both systems can be wirelessly recharged via the wireless power transfer (WPT) method that uses electromagnetic induction to transfer energy […]
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555 VCO revisited
It is well known that a 555 timer in astable mode can be frequency modulated by applying a control voltage (CV) to pin 5. The schematic on the left of Figure 1 shows this classic 555 VCO. Figure 1 Classic VCO (left) and new 555 VCO variant (right), where Pin 5 is not modulated, which […]
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TP-Link’s Kasa HS103: A smart plug with solid network connectivity
With Amazon’s smart plug teardown “in the books”, our engineer turns his attention to some TP-Link counterparts, this first one the best behaved of the bunch per hands-on testing results. Two months back, I introduced you to several members of TP-Link’s Kasa and Tapo smart home product lines as successors to Belkin’s then-soon and now […]