Peter Demchenko

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Peter Demchenko

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  • 08.14.2017
  • The weed-eater circuit
  • Yes, assuming a correct answer of the pretendent, the next obvious question - about the gain this stage of amplifier can provide - seems superfluous!
  • 05.31.2017
  • Double µC’s PWM frequency & resolution
  • In its essence a PWM signal is a pulse wave. To get a PWM signal with 180° phase difference it is sufficient to invert the original PWM. If the both amplitudes are equal and the inverter is fast enough you'll get a complementary PWM signal(s)... Agree? I can't see which use can you have from the Fourier series here.
  • 05.24.2016
  • LED current regulator has low dropout
  • What about to read the text one more time? It deals with the lowest possible drop... The 20V is a very modest value, why not 1000? :) And "Q3's parameters" include not only "beta"... Sapienti sat :)
  • 05.01.2017
  • Hubsan FPV drone teardown
  • Good stuff for all ages. Reminds me my disassembling of HC-500 Scouting Trail Camera... While surely simpler, it responds to the same human instinct - to investigate) Let each take-off ends in good landing!
  • 04.03.2017
  • I Sing the Capacitor Electric
  • I noticed quite audible "ticks" from the film capacitor (47mkF) @ 12V. But the pulses were rather short.
  • 03.10.2017
  • DC Transformer? Forward converter? Isolation amp? You decide!
  • We are lucky enough to have the world where almost any thing can have many purposes! In this case they are enclosed within one discipline, whereas mostly they are far one from another... Look at the nettle, for example. It is a feed for cattle, a feedstock for a soup at spring, and also a means of a reasonable punishment. One more: "the same thing takes out the water and produces your offsprings" - Heinrich Heine "On Teleology"
  • 12.12.2016
  • Scoping a filter response – with math
  • The setup seems interesting. How clear the output spectrum is? I sometimes use products of Soundtechnology (SpectraLab). They provide both sweep tone and the FFT math.
  • 11.15.2016
  • Capacitor self-diagnostics
  • Thank you for your attitude! For sure the ADC was exactly suitable for the circuit. Should I recheck?