guard rings

Started by Anonymous in sci.electronics.design2 years ago 26 replies

Some schottky diodes have a PN junction in parallel, a "guard ring" that acts like a parallel zener to improve ESD specs, and may help with the...

Some schottky diodes have a PN junction in parallel, a "guard ring" that acts like a parallel zener to improve ESD specs, and may help with the fab somehow. That's OK, but at high currents the PN diode can turn on, and it's slow to turn off and can even act like a step-recovery diode. I wonder if there is a way to tell, from the data sheets, if there is a guard ring. VI curve? CV curve? ES...


Over Voltage Protection Crowbar Circuit

Started by panfilero in sci.electronics.design10 years ago 73 replies

I'm needing an over-voltage protection circuit to put at the output of a switching regulator that takes in 100V input and drops it to 24V... I'd...

I'm needing an over-voltage protection circuit to put at the output of a switching regulator that takes in 100V input and drops it to 24V... I'd like to protect the output from going over 28V. Here's the 3 options I was considering: For all the options the point is to blow my 5A fast acting fuse that's at the input, so I'm trying to decide on a way to short my output 1. A Zener - I'm think...


Using NE2 bulbs as voltage regulators

Started by Geoffrey S. Mendelson in sci.electronics.design7 years ago 33 replies

I am building an experimental radiation detector. Being an experiment, I want to avoid buying anything for it. Sort of a junkbox project to...

I am building an experimental radiation detector. Being an experiment, I want to avoid buying anything for it. Sort of a junkbox project to see what could be done using the parts I have. The geiger muler tubes I have require 400 volts. I could do it easily buy buying 200 volt zener diodes and put two in series. Or I could buy a 400 volt gas discharge tube from a Soviet geiger counter cheapl...


MC34063 Step-down Converter Heating Problem

Started by Anand P. Paralkar in sci.electronics.design11 years ago 21 replies

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown...

Hi, I have constructed a DC-DC step-down converter using the MC34063. The circuit I use is very similar to the one shown here: http://www.eleccircuit.com/wp-content/uploads/2008/01/ipod-mp3-player-charger-by-mc34063.jpg My circuit does not have the Zener, output side LED and input side protection diodes (TVS1 and D2 in the circuit). The rest of the circuit is quite similar. The...


URL of the AoE III errata website?

Started by Don in sci.electronics.design3 months ago 1 reply

Does an AoE III errata website exist? If so, does anyone know its URL? AoE III Exercise 9.1 implies a 10 W power dissipation occurs when 1 A...

Does an AoE III errata website exist? If so, does anyone know its URL? AoE III Exercise 9.1 implies a 10 W power dissipation occurs when 1 A flows through a 5 V zener. But. it seems to me the actual dissipation is 5 W. Danke, -- Don, KB7RPU, https://www.qsl.net/kb7rpu There was a young lady named Bright Whose speed was far faster than light; She set out one day In a relative way...