Having spent over 50 years in electronic labs, designing and testing, I find myself trying to test zener diodes, FETs, LEDs, transistors and...

Having spent over 50 years in electronic labs, designing and testing, I find myself trying to test zener diodes, FETs, LEDs, transistors and many other semiconductor devices. I end up kluging parts to generate a current source with enough voltage compliance to suit my needs. After searching Amazon, eBay and most test equipment vendors, I find a lot of units but none that fit my needs. So...

Lots of CMOS gates and such are tolerant of pin voltages above Vcc, typically rated for 7 volts max. Does anybody know what sort of input...

Lots of CMOS gates and such are tolerant of pin voltages above Vcc, typically rated for 7 volts max. Does anybody know what sort of input circuits are typically used? Does it behave like a zener? To ground? Some parts specify an allowed input curent in the pullup direction, some don't. I'm designing a really tiny board, and an opamp can potentially overdrive an analog mux, an FSA3157....

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...

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...

I have an opamp with a 10 volt positive supply and need the output to swing to about 16 volts. I was thinking I could add a paralleled 6.8 volt...

I have an opamp with a 10 volt positive supply and need the output to swing to about 16 volts. I was thinking I could add a paralleled 6.8 volt zener, a cap, and a floating power supply at the opamp output. The power supply could be a PV optocoupler like this: https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TLP3905-TPR-E/78098 04 My load is obviously light, a

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...

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...

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...