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Posts by Olin Lathrop‭

363 posts
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Q&A how to figure out the max power of a transformer?

If there isn't a VA rating on the label or published in a reliable source, then you have to guess. There are several clues that can be used: Look at the size of the primary wires. That gives you...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

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Q&A What is the role of master clock speed on DAC

In protocol I2S we have 4 signal: 1.data 2.lrck/fck (frame synchronizer) 3.bck (bit clock) 4.mck/sck (master clock) Not really. IIS really only has 3 signals: bit data, bit clock, and left/right ...

posted 2y ago by Olin Lathrop‭

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Q&A How is it possible to perform a open circuit test on a induction motor?

Your basic problem is that the motor needs some applied power to generate any EMF, but if you apply that power then its not an open circuit test. For a true induction motor you're probably stuck. ...

posted 2y ago by Olin Lathrop‭

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Meta Tag naming guidelines.

Adding to what Lundin said (+1): s is seconds, S is siemens (1/Ω). What we write here is inherently HTML. Greek characters like µ and Ω are defined as HTML entities, and can always be writte...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A CAN BUS monitoring with a LED

CAN lines in the most common implementation have 60 Ω impedance between them. Anything that is substantially larger than that won't effect the lines much. I'd use 1 kΩ at least, preferably more. ...

posted 1y ago by Olin Lathrop‭

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Q&A Determining the output swing, output common-mode range and input common-mode range in a differential amplifer

First, common mode is something that only applies to a differential signal. When a signal is encoded in the difference between two voltages, the common mode voltage is the average of the two. The...

posted 1y ago by Olin Lathrop‭

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Q&A ESD Table Earth Bonding Points - Why?

I've never been involved with the design of an ESD table, so I can only imagine some reasons to put grounding connections at the front: For convenience. If you've got a table specifically for ESD...

posted 10mo ago by Olin Lathrop‭  ·  edited 10mo ago by Olin Lathrop‭

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Q&A Missing voltage rating

They don't outright tell you the maximum operating voltage, probably because that would imply a power level beyond what they think anyone would use this connector with. Note that it is intended fo...

posted 10mo ago by Olin Lathrop‭  ·  edited 10mo ago by Olin Lathrop‭

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Q&A Opto-coupler, slow turn off

Some optos are really slow. What off time is yours specified for? Your circuit could be better. The transistor is turned on thru 1 kΩ, but off thru 11 kΩ. You are also giving it way more base c...

posted 6mo ago by Olin Lathrop‭

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Q&A How does JFET biasing work in a 2-terminal electret condenser microphone?

The voltages from the raw microphone are quite small and fairly high impedance. That's why an amplifier at the mic is needed in the first place. The signal on the wire would be way too small comp...

posted 5mo ago by Olin Lathrop‭

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Q&A Solder mask bridge issue

Talk to your board house. 4 mil slop for the soldermask around pads is excessive. Leaving 4 mils is fine for larger parts, but as you say, it doesn't work for fine pitch. The main reason for mak...

posted 2mo ago by Olin Lathrop‭

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

Microwave ovens work on the frequency they do because that's one of the main resonant frequencies of water molecules. The radiation excites water molecules, which then transfer some of their extra...

posted 4y ago by Olin Lathrop‭  ·  edited 4y ago by Olin Lathrop‭

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Q&A What Sine-Wave Oscillator can be controlled with a microcontroller?

pure stable sinusoidal wave This is impossible. Forget it. Go home. No matter what you do, there will always be some noise added to the sine wave. Some random noise and some harmonic distortio...

posted 2y ago by Olin Lathrop‭

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