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Posts by TonyStewart‭

42 posts
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Q&A Confusion in operation of analog computer

The two-terminal symbol for the attenuator comes from 3 pin potentiometer (pot.) referenced to 0V = "GND" The summing amplifier is always inverting and gives you 3 options for gain which means i...

posted 11mo ago by TonyStewart‭  ·  edited 11mo ago by TonyStewart‭

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Q&A estimation of pogo pin resistance

I agree with Olin that unknown contact area is the biggest variable. I think the scientific way is to test and verify each contact using a 4 pin kelvin bridge. The sum of 2 pins carrying constant...

posted 3mo ago by TonyStewart‭  ·  edited 3mo ago by TonyStewart‭

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Q&A Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor?

The 70.9/40.8 A rating for L.R. is rated only for ; Locked rotor time 19s (cold) 11s (hot) I doubt this meets your requirements unless you modify from a forced air cooling motor to a pumped liqu...

posted 5mo ago by TonyStewart‭  ·  edited 5mo ago by TonyStewart‭

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Q&A What fabrication process is being used for jellybean parts

As of the early 2020s, common technology nodes for SSI (Small-Scale Integration) and MSI (Medium-Scale Integration) ICs include nodes such as 180nm, 130nm, 90nm, 65nm, 45nm, and 28nm. Each technolo...

posted 5mo ago by TonyStewart‭  ·  edited 5mo ago by TonyStewart‭

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Q&A Driving LED with NPN transistor from I/O pin

If you choose suitable ultrabright LEDs , there is no need to use 40 mA. I have over 10 thousand LEDs all over 16,000 mcd at 20 mA which is painfully bright for close indicator but works well 100 ...

posted 7mo ago by TonyStewart‭  ·  edited 7mo ago by TonyStewart‭

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Q&A derating MLCC ripple current for transient current spikes

Remember that RMS measurements assume at least 1 cycle or in your case 100 ms or 10 Hz. So the Ripple Current/rms vs Temp rise is always valid for any duty cycle. This means in theory you can rai...

posted 7mo ago by TonyStewart‭

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Q&A Will shorting a lithium ion battery cause an explosion?

Will shorting a lithium ion battery cause an explosion? Chain Reaction: The release of flammable gases can lead to a chain reaction, where the heat generated by the short circuit causes even m...

posted 7mo ago by TonyStewart‭

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Q&A Why 3.3V instead of 3V?

The other answers are excellent justification to the the industry standards imposed on CMOS logic. The historical migration to smaller lithography CMOS led to lower Cds values which led to faster ...

posted 8mo ago by TonyStewart‭

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Q&A Power switches and automotive load dump, unclamped

The spec 79V 0.5 ohm 5ms = 62.41 Joules . The TVS must be rated for a low temp. rise at this energy dump or higher. MOV's are limited by the number of discharges as the oxide wears out, but may be...

posted 8mo ago by TonyStewart‭

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Q&A Microwave oven interfering with WiFi on the 2.4GHz band

Microwave Materials, Spectrum then EMI effects on SNR of WiFi, BT. There are a lot of measurable parameters in microwave dielectrics which affect; Dielectric Constant , Dk between conductors an...

posted 3y ago by TonyStewart‭  ·  edited 3y ago by TonyStewart‭

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Q&A Over-voltage protection for device with photovoltaic cell source

This IC is not well suited for the task. MPPT (Maximum Power Point Tracking) relies on matching impedance according to the maximum power transfer theorem. However, in the case of a photovoltaic ar...

posted 11mo ago by TonyStewart‭  ·  edited 11mo ago by TonyStewart‭

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Q&A What are these transformer graphs about?

For R loads I is in phase with V. For L loads , V lags I up to 90 deg. For C loads, I lags V up to 90 deg. The trigonometric tangent angle is the ratio of impedance: Real to reactive. Your le...

posted 11mo ago by TonyStewart‭

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Q&A Minimizing Common Mode Radiation - Separating Grounds

The problem with cable emissions from HS data and SMPS noise is very common even with UTP and ribbon cable with adjacent grounds on differential signals. I have seen this frequently on HDD testing...

posted 1y ago by TonyStewart‭

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Q&A Can confusing the plugs for earphones and microphones do any damage?

If you mean electret microphone, no damage to JFET buffer. Microphone input won't damage a headset with it's current limited pullup resistor for electret Mics.

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

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Q&A Results of analysis of Hartley oscillator dont make sense

This LC circuit depends on several criteria for stable linear oscillation; 180 deg phase shift ( with 3rd order LC network) plus 180 degree inversion to achieve the oscillation criteria of 0 or ...

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

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Q&A Is there a way to reliably measure antenna return loss outside a lab?

The RSSI detector in the receiver is the best field tool. In Windows I had a tool (Wifi Radar?) that read the Broadcom IC RSSI and displayed a time plot of the results as I changed laptop orientati...

posted 3y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

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Q&A How to estimate time of completion while developing an electronic product?

In my 15 yrs of intense deadline R&D for new state-of-the-art design in my 45yrs experience, estimation of time is inversely proportional to the number of mini failures from bad assumptions fro...

posted 3y ago by TonyStewart‭  ·  edited 3y ago by TonyStewart‭

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