开云体育

geo: Make before break is a good idea, but not necessary. You can have a resistor always in the circuit which sets the highest voltage setting and when the switch is rotated other resistors are place

https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2063-2064-2065.pdf a 2uA opamp...... wow. rogerw -- rogerw On the Catclaw ΜΟΛΩΝ ΛΑΒΕ The PanDemic is over, but the

Hi Cliff, boy you sure opened an interesting topic! I'm struggling to keep up and am learning a lot, but slowly. The rotary switch and a hand full of Zeners, yes that would work, as long as it's a

Dear Geo, How about a rotary selector switch with different combinations of zeners to select voltage on the fly? Old style would be a rotary rheostat, but that would waste energy or not be practical

not a problem P. Just curious. Already got more projects than space-time Well, 1 ma min isn't going to do me any good with 1kV or 2kV bias supplies.. Back to the ol' op-amp + 1G resistor. Geo "peter

Geo: Sorry I don't remember the part numbers. I saw an announcement by Microchip a while ago, but I can't find it, must have been vapor. TI has a TL783 ( 125V) but its a series and not a shunt

" (On a different not there some newer ones that go up to 125 volts or so,) P . " Really? Nice. Gat a part# or series? Do you know if they can be "floated" (with an eye on stacking) ? Geo To:

Yes, I see that and I should have thought of it..... MindSim failed! That 1mA must be the minimum to power the onchip reference and opamp. Oh well, back to the drawing board! I suppose it could be

I will look into that. rogerw -- This email has been checked for viruses by AVG. https://www.avg.com

Roger: This is what Geo was asking in lieu of a zener. Well, there may be a limitation due to minimum current requirements of the IC shunt regulator chip. I think the spec sheet notes about 1ma for

Geo, Peter, Well how about this enclosed circuit(s)? The TL431 2,5V reference voltage is going to be an onchip bandgap generated voltage reference and the TI spec gives 3 grades: 0.5%, 1%, and 2% unit

OK on 1.25, that's even better. I wonder how precision that reference Voltage is? That's a good Voltage to have, if it's accessible.No never used it except for the primary shunt HV reg. and never

geo: the xx431 starts at 1.25V( or at least some of them do) Most of the other shunt regs start at 2.5V But in either case, I think they are only spec'd for 1mA and up of current. Don't know how they

I do too

"Geo: You can adjust the HV shunting voltage by either changing the resistor between base and ground or by changing the value of the zener and or both."That's why I'm following this thread so close, a

"but not everyone has one.I may also try your shunt regulator across the primary side idea!P"Take a look at the other topics on this CDV700Club list P., I have the assembled boards for the CDV-700

I also like the "zener referenced adjustable regulation in the LV primary side of the transformer." In that case, the transformer does the translation to HV with some fixed winding ratio, rather than

Hi Mike L.Good timing for Hi-Range tubes for sure.I'm in need of an Si-3BG Glass Ruddian Hi Range for a project, anyone have a spare? It doesn't even have to work, but does need to be intact for a

Geo: You can adjust the HV shunting voltage by either changing the resistor between base and ground or by changing the value of the zener and or both. In theory, the Vbe temperature coef can be

This does seem like a good price BUT...the seller clearly says that they are defective, so YMMV