Hi I have a triac control circuit in which I supply gate current all the time to avoid zero crossing...

Hi I have a triac control circuit in which I supply gate current all the time to avoid zero crossing noise. https://electronicsdesign.dk/tmp/TriacSolution.PNG Apparently, sometimes the circuit spontaneously turns on the triac. It's probable due to a transient, high dV/dt, turning on via "rate of rise of offstate voltage" limits. The triac used is BT137S-600: https://www.mouse

I guess that gives me second thoughts about replacing the lead-acid batteries in my wheelchair with lithium given the size required... (Not...

I guess that gives me second thoughts about replacing the lead-acid batteries in my wheelchair with lithium given the size required... (Not going to store a $40K chair outside "just to be safe"!)

Pardon a post about electronic design. In a recent Dave Jones EEVBlog video nr 1561 ... ... he shows his USB powered variable bench...

Pardon a post about electronic design. In a recent Dave Jones EEVBlog video nr 1561 ... ... he shows his USB powered variable bench power supply. At about 28:10 the regulator schematic is shown. I am baffled why he uses two series pass transistors; one for current, one for voltage. I cannot recall ever seen the functionality split into tw

There seems to be quite a few youtube videos showing their use of Qspice. But, has any one here been playing around with it? If so, how do you...

There seems to be quite a few youtube videos showing their use of Qspice. But, has any one here been playing around with it? If so, how do you feel about it? Thanks, John

What do you call a nigger in college? ...Janitor. What do you call 100 parachuting niggers? ...Skeet. Why did all the blacks die in...

What do you call a nigger in college? ...Janitor. What do you call 100 parachuting niggers? ...Skeet. Why did all the blacks die in Vietnam? ...When the sergent said "Get down!", they got up and started dancing. What did the black kid get for Christmas? ...My bike. What do you throw a drowning nigger? ...his family. How do you scare a black person? ...Take him to an auction. ...

Cool book. https://www.amazon.com/Empire-Sum-Reign-Pocket-Calculator/dp/0393882144 It ends by saying that, basically, the calculator is...

Cool book. https://www.amazon.com/Empire-Sum-Reign-Pocket-Calculator/dp/0393882144 It ends by saying that, basically, the calculator is now dead. I have four HP32's, and an excellent HP calc clone on my phone. My first calculator was an HP35, so my brain is hardwired in Reverse Polish.

This is an interesting new take on modelling quantum correlations by analogous classical point mass distributions. It might eventually lead to...

This is an interesting new take on modelling quantum correlations by analogous classical point mass distributions. It might eventually lead to a better understanding of both but for now it is just a curiosity. https://physicsworld.com/a/theorists-unearth-new-link-between-entanglement-and-classical-mechani cs/ The actual paper is not behind a paywall for once: https://journals.aps.org

I had to visit a package store, yesterday, to buy some booze for a friend's bday. After ringing up the sale, he asked for my ID (REALLY? Do I...

I had to visit a package store, yesterday, to buy some booze for a friend's bday. After ringing up the sale, he asked for my ID (REALLY? Do I look *20*? 30?? 40???) Turns out, they've got a little appliance to verify your age. Despite the fact that the two items most visible on the license are your birthdate... and your birthdate?? Just how low have they set the qualifications for ca...

I have many "scenes" that are covered by multiple cameras. I don't want to burden the user with complicated setup instructions: - mount...

I have many "scenes" that are covered by multiple cameras. I don't want to burden the user with complicated setup instructions: - mount cameras - aim in general direction of scene - ensure some level of overlap - press "Calibrate" button Of course the software can advise the user if he has not given it adequate coverage ("Please adjust camera #5...") [This assumes static camera positi...

Hi I recently bought a EMI test receiver HP 85422E at an auction. I have tested it, directing a single frequency into the RF input. The...

Hi I recently bought a EMI test receiver HP 85422E at an auction. I have tested it, directing a single frequency into the RF input. The gain is spot on, at most 0.5dB off. But the frequency is wrong. If I enter 50MHz, I get 20MHz peak. If I then add 100MHz, it only increased the peak by 73MHz. It's consistent, every time I increase by 100MHz, only 73MHz is seen (generator has been check...