Jordan Dimitrov

Oct 2, 2024 | edn.com | Jordan Dimitrov

If you need a very pure sine wave in the audio range, the circuit in Figure 1 can help. It is a simple deal: A sine wave with a THD of 1% coming from a function generator that goes through a trackable low-pass filter, which attenuates the distortion-causing harmonics by a factor of 7900 (-78 dB) or more. The result is a sine wave with less than 0.0002% (2 ppm) distortion.

Dec 18, 2023 | edn.com | Jordan Dimitrov

A recent Design Idea presents a circuit to measure an airflow rate up to 2000 fpm using two transistors in a Darlington configuration. One transistor works as a self-heated thermal sensor and the other one compensates for ambient temperature variations. The circuit is smart and simple; however, the output voltage depends on the input flow rate in a very nonlinear fashion.

Oct 10, 2023 | nature.com | Luis M. Molinos-Albert |Pierre Rosenbaum |Thierry Hieu |Dominique Clermont |Jordan Dimitrov |Sophie Hue | +1 more

AbstractHIV-1 infection causes severe alterations of gut mucosa, microbiota and immune system, which can be curbed by early antiretroviral therapy. Here, we investigate how treatment timing affects intestinal memory B-cell and plasmablast repertoires of HIV-1-infected humans. We show that only class-switched memory B cells markedly differ between subjects treated during the acute and chronic phases of infection.

Mar 7, 2023 | ednasia.com | Jordan Dimitrov

Article By : Jordan Dimitrov The RMS value of a time dependent voltage or current is based on the simple concept of equality of power dissipation; however, its theoretical calculation or instrument implementation may not be easy. Reference 1 explains the principles of RMS measurements and compares performance of 20 digital multimeters (DMMs). The results are alarming.

Mar 2, 2023 | edn.com | Jordan Dimitrov

The RMS value of a time dependent voltage or current is based on the simple concept of equality of power dissipation; however, its theoretical calculation or instrument implementation may not be easy. Reference 1 explains the principles of RMS measurements and compares performance of 20 digital multimeters (DMMs). The results are alarming. Many units report lower RMS values than expected; for some instruments, numbers are almost half of what they should be.