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1,894 Comments
Tomi Engdahl says:
https://groupdiy.com/threads/active-ribbon-mic.5743/page-15#post-929033
Tomi Engdahl says:
https://groupdiy.com/threads/active-ribbon-mic.5743/page-15#post-929033
https://groupdiy.com/threads/diy-inline-preamp-triton-fethead.74048/
Tomi Engdahl says:
https://groupdiy.com/threads/diy-inline-preamp-triton-fethead.74048/
Tomi Engdahl says:
https://www.industrial-eu.dbk-group.com/ptc-heating-technology
Tomi Engdahl says:
https://www.harwin.com/blog/power-and-voltage-ratings-for-connectors
What is the Difference Between GX12 Connector and GX16 Connector?
https://renhotecpro.com/news/what-is-the-difference-between-gx12-connector-and-gx16-connector.html
https://forum.duet3d.com/topic/17488/aviation-connectors
Tomi Engdahl says:
https://lectromec.com/voltage-current-and-thermally-rating-connectors/
Tomi Engdahl says:
https://www.edn.com/power-tips-137-implementing-llc-current-mode-control-on-the-secondary-side-with-a-digital-controller/
Tomi Engdahl says:
https://www.edn.com/1-a-20-v-pwm-controlled-current-source/
Tomi Engdahl says:
https://hackaday.com/2025/02/10/flip-flops-make-great-soft-switches/
Tomi Engdahl says:
https://hackaday.io/project/187036-to-220-dc-dc-buck-converter
Tomi Engdahl says:
Understanding The Miller Effect
https://hackaday.com/2025/02/13/understanding-the-miller-effect/
As electronics rely more and more on ICs, subtle details about discrete components get lost because we spend less time designing with them. For example, a relay seems like a simple component, but selecting the contact material optimally has a lot of nuance that people often forget. Another case of this is the Miller effect, explained in a recent video by the aptly named [Old Hack EE].
Put simply, the Miller effect — found in 1919 by [John Milton Miller] — is the change in input impedance of an inverting amplifier due to the gain’s effect on the parasitic capacitance between the amplifier’s input and output terminals. The parasitic capacitance acts like there is an additional capacitor in parallel with the parasitic capacitance that is equivalent to the parasitic capacitance multiplied by the gain. Since capacitors in parallel add, the equation for the Miller capacitance is C-AC where C is the parasitic capacitance, and A is the voltage gain which is always negative, so you might prefer to think of this as C+|A|C.
The example uses tubes, but you get the same effect in any inverting amplification device, even if it is solid state or an op amp circuit. He does make some assumptions about capacitance due to things like tube sockets and wiring.
The effect can be very pronounced. For example, a chart in the video shows that if you had an amplifier with gain of -60 based around a tube, a 10 kΩ input impedance could support 2.5 MHz, in theory. But in practice, the Miller effect will reduce the usable frequency to only 81.5 kHz!
The last part of the video explains why you needed compensation for old op amps, and why modern op amps have compensation capacitors internally.
Tomi Engdahl says:
A Novel ZVS/ZCS Push-Pull LC Resonant DC-DC Converter for Energy Sources
https://www.mdpi.com/1996-1073/16/6/2892?fbclid=IwY2xjawIa5GtleHRuA2FlbQIxMQABHZmOtIMyc3OChye60VHZ0G1ihfC_f4Ucz2gc13xnfaWUTZCYg0NLynaACg_aem_bRGJmICk1lgsF0zI1tVUWw
Tomi Engdahl says:
https://www.edn.com/how-shielding-protects-electronic-designs-from-emi-rfi-disruptions/
Tomi Engdahl says:
https://www.edn.com/a-class-of-programmable-rheostats/
Tomi Engdahl says:
Fixing the Full Bridge Rectifier’s Big Flaw – Active Power Factor Correction
https://www.youtube.com/watch?v=eI_LQWrQam4
Full bridge rectifiers may seem great, but there’s a pretty big problem with them that is becoming ever more relevant.
What happens when:
0:00 Introduction
0:20 How a full bridge rectifier works
1:36 The problem With FBRs
3:23 Power factor
5:10 Power factor correction
5:49 Building a boost PFC circuit
10:24 Advanced PFC circuits
11:31 Conclusion
11:48 Outro
Tomi Engdahl says:
https://www.edn.com/gan-transistors-fit-standard-si-packages/#google_vignette
Tomi Engdahl says:
https://www.edn.com/how-to-measure-psrr-of-pmics/
Tomi Engdahl says:
https://www.edn.com/tracking-preregulator-boosts-efficiency-of-pwm-power-dac/
Tomi Engdahl says:
https://www.edn.com/flip-on-flop-off/
Tomi Engdahl says:
https://www.edn.com/build-esd-protection-using-jfets-in-op-amps/
Tomi Engdahl says:
https://www.diyaudio.com/community/threads/how-to-make-a-loudspeaker-sandwich-cone.402917/
Tomi Engdahl says:
https://www.edn.com/investigating-injection-locking-with-dso-bode-function/
Tomi Engdahl says:
https://etn.fi/index.php/new-products/17203-pieniae-kuormia-yli-90-prosentin-hyoetysuhteella
STMicroelectronics on julkistanut uuden DCP3601-buck-muuntimen, joka yhdistää pienen koon, korkean hyötysuhteen ja yksinkertaisen rakenteen. Vain kuusi ulkoista komponenttia vaativa DCP3601 mahdollistaa kustannustehokkaiden ja kompaktien piirisuunnittelujen toteuttamisen.
Buck-muunnin on hakkurivirtalähde, joka alentaa lähtöjännitettä suhteessa tulojännitteeseen. ST:n uusi muunnin toimii 3,3V–36V syöttöjännitteellä ja kykenee tuottamaan 1A lähtövirran, mikä tekee siitä ihanteellisen valinnan esimerkiksi älymittareihin, kodinkoneisiin ja teollisuuden 24V-muunnoksiin. Sen synkroninen tasasuuntaus ja 1 MHz:n kytkentätaajuus takaavat korkean hyötysuhteen kaikissa käyttötilanteissa, yltäen jopa 91 prosenttiin 600 mA kuormituksella (12V sisään, 5V ulos).
Tomi Engdahl says:
The DCP360 series is ideal for major appliances, smart metering, and 24 V industrial bus conversion
https://www.st.com/content/st_com/en/campaigns/advanced-synchronous-buck-converters.html?icmp=tt42873_gl_pron_feb2025
Tomi Engdahl says:
DIN rail power supply adds IO-Link interface and display
https://www.eenewseurope.com/en/din-rail-power-supply-adds-io-link-interface-and-display/
Tomi Engdahl says:
https://hackaday.com/2025/03/11/lies-damned-lies-and-igbt-datasheets/
We have all seen optimistic claims for electronic products that fail to match the reality, and [Electronic Wizard] is following one up in a recent video. Can a relatively small IGBT really switch 200 A as claimed by a dubious seller? Off to the datasheet to find out!
The device in question is from Toshiba, and comes in a TO-220 package. This itself makes us pause for a minute, because we suspect the pins on a TO220 would act more like fuses at a steady 200 A.
Tomi Engdahl says:
https://www.digikey.fi/fi/articles/the-fundamentals-of-digital-potentiometers
Tomi Engdahl says:
https://www.edn.com/100-mhz-vfc-with-tbh-current-pump/
Tomi Engdahl says:
http://douglas-self.com/ampins/dipa/dipa.htm
Tomi Engdahl says:
https://hackaday.com/2025/03/17/current-mirrors-tame-common-mode-noise/
Tomi Engdahl says:
Turning Down The Noise On SMPS
https://hackaday.com/2025/03/17/turning-down-the-noise-on-smps/
On paper, electricity behaves in easy-to-understand, predictable ways. That’s mostly because the wires on the page have zero resistance and the switching times are actually zero, whereas in real life neither of these things are true. That’s what makes things like switch-mode power supplies (SMPS) difficult to build and troubleshoot. Switching inductors and capacitors tens or hundreds of thousands of times a second (or more) causes some these difficulties to arise when these devices are built in the real world. [FesZ Electronis] takes a deep dive into some of the reasons these difficulties come up in this video.
The first piece of electronics that can generate noise in an SMPS are the rectifier diodes. These have a certain amount of non-ideal capacitance as well as which causes a phenomenon called reverse current, but this can be managed by proper component choice to somewhat to limit noise.
SMPS Noise Analysis – The Actives
https://www.youtube.com/watch?v=2Vi2MoN7Mhw
Tomi Engdahl says:
Electronics Tutorial – How the Basic SMPS work: the Buck, Boost and Buck-boost
https://www.youtube.com/watch?v=89KNjEnIwWM&list=PLT84nve2j1g-6BMw6uWLujcbgIz8SyaPt
Tomi Engdahl says:
https://hackatronic.com/linear-regulated-power-supply-block-diagram-circuit-diagram/
Tomi Engdahl says:
https://www.edn.com/a-closer-look-at-pcie-6-0-interoperability-performance-testing/#google_vignette
Tomi Engdahl says:
https://www.edn.com/pwm-programmed-lm317-constant-current-source/
Tomi Engdahl says:
https://www.edn.com/injection-locking-acts-as-a-frequency-divider-and-improves-oscillator-performance/
Tomi Engdahl says:
https://www.elektormagazine.com/news/circuit-diy-resonance-meter?fbclid=IwY2xjawJOoypleHRuA2FlbQIxMQABHdSxdwlTIqg2bg6DlgrNk3jRLq86D-VRkFeUInNIkCc_2hzlLbGqjUlfyw_aem_ITu1Rb7o8tuwirM6K4yO3A
Tomi Engdahl says:
https://www.edn.com/how-to-design-a-feedback-loop-compensator-for-a-flyback-converter-in-four-steps/
Tomi Engdahl says:
https://www.premierguitar.com/diy/pedal-projects/pedalboard-power-supply
Tomi Engdahl says:
https://www.edn.com/power-tips-139-how-to-simplify-ac-dc-flyback-design-with-a-self-biased-converter/
Tomi Engdahl says:
Equalisers, The Various Types And How They Work
https://sound-au.com/articles/eq.htm
Tomi Engdahl says:
https://hackaday.com/2025/04/01/why-the-lm741-sucks/