Alfred Rosenkränzer (57)

7-05-2026 | Mains hum from loudspeakers isn’t always caused by bad wiring, poor cables, interference, or grounding issues. Sometimes the amplifier power...

6-05-2026 | A few years ago, QuantAsylum’s QA403 filled a niche between costly high-end analyzers and basic hobbyist setups. In this article, we examine...

1-05-2026 | High-frequency circuits have different demands than low-frequency designs like audio. Standard prototyping boards fall short for RF due to t...

1-05-2026 | A few years ago, the QA403 from QuantAsylum filled a gap in the market — positioned between audio analyzers priced like new cars on one side...

27-04-2026 | Professional audio systems often use fully differential signal chains — from inputs and outputs to ADCs, DACs, and filtering stages — to ach...

1-03-2026 | In the previous issue, an adjustable DC load was presented. It allows the implementation of an electronic load for DC power supplies and can...

9-02-2026 | This article covers an extended, symmetrical version of an adjustable DC load. The design is suitable, for example, for testing the typicall...

18-01-2026 | Connecting peripherals like USB sticks to a PC is usually straightforward since they share the same ground potential. However, USB-connected...

1-01-2026 | The advantages of using an adjustable DC load for power supply testing are clear: There is no need to work with a collection of different lo...

1-08-2025 | At the end of 2024, my opamp tester for audio applications [1] was published. It enables evaluation of various opamps under identical condit...