Electronics Design

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How do UPS trigger circuits work?

After using a pair of inverter/charger circuits as UPS units for some months I've become curious as to how the trigger...
15 comments posted 3yrs
posted by bp
15 comments posted 3yrs posted by bp

cool books

Not Much of an Engineer by Stanley Hooker Fighter by Len Deighton
1 comments posted 3yrs
posted by jlarkin
1 comments posted 3yrs posted by jlarkin

Triacs in Parallel

Gentlemen, I guess this is going to be a non-starter, but here goes: Can I put two BT137 8 Amp triacs in parallel and ge...
33 comments posted 3yrs
posted by cd
33 comments posted 3yrs posted by cd

Musical Coherence Limitations

I was just watching the Tabernacle Choir and realized they had some 360 people singing in unison adequate to preserve t...
14 comments posted 3yrs
posted by gnuarm.deletethisbit
14 comments posted 3yrs posted by gnuarm.deletethisbit

thermistors in parallel

Imagine a chassis with up to eight plugin boards. The chassis has a pair of PWM controlled fans. https://www.dropbox.co...
41 comments posted 3yrs
posted by jlarkin
41 comments posted 3yrs posted by jlarkin

AC/DC equivalent power delivery question

This is in regard to the HV oil/water separation. The first experiment, had very good results in 5 minutes using AC. I'...
14 comments posted 3yrs
posted by amdx62
14 comments posted 3yrs posted by amdx62

Re: Defeating Breathalyzer Ignition Interlocks

> The newest "weapon" in the crusade against drinking and > driving - breathalayzer type ignition interlocks for the >...
0 comments posted 3yrs
posted by drb394
0 comments posted 3yrs posted by drb394

In Texas He Would Have Been Shot!

https://news.yahoo.com/penalty-reduced-man-took-leaf-154758663.html Yeah, if he did this in Texas, he would have been sh...
28 comments posted 3yrs
posted by gnuarm.deletethisbit
28 comments posted 3yrs posted by gnuarm.deletethisbit

Reverse Engineering Rights

I know that some regions provide the right of a consumer to reverse engineer products they have bought. As an example,...
27 comments posted 3yrs
posted by gnuarm.deletethisbit
27 comments posted 3yrs posted by gnuarm.deletethisbit

EVGO CHPT

CSU (Cal State U) is now anti-EV. During the pandemic, I got kicked out of their chargers. Now, all chargers go dark. I...
13 comments posted 3yrs
posted by edward.ming.lee
13 comments posted 3yrs posted by edward.ming.lee

Tek Concepts books

The Tek power supply thread reminded me of these interesting old books, some of which are still an excellent read. http...
12 comments posted 3yrs
posted by pcdhSpamMeSenseless
12 comments posted 3yrs posted by pcdhSpamMeSenseless

EV Charging and Pacemakers

It sounds like anyone with common sense would be ok. Who would stand by a charger for any length of time?
4 comments posted 3yrs
posted by deanh6929
4 comments posted 3yrs posted by deanh6929

OT: Public transport

Can't we just get rid of public transport? I asked Google Maps for a route from my house to somewhere I want to go on h...
204 comments posted 3yrs
posted by CK1
204 comments posted 3yrs posted by CK1

Help with a voltage multiplier

In my junque box I have a High Voltage, Voltage multiplier. I pulled it out to help my son on a project and it doesn't...
22 comments posted 3yrs
posted by amdx62
22 comments posted 3yrs posted by amdx62