| Electronics > Projects, Designs, and Technical Stuff |
| It looks for me as stupid schematic (Oldtimers welcome!) |
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| 001:
Thank You for detailed answer Can You post schematics You told (and built)? |
| 001:
--- Quote from: floobydust on October 03, 2019, 06:30:17 pm --- They are dangerous to develop on the workbench and unforgiving of mistakes. There is no simple circuit out there that is 100% solid-state. Sorry but that fantasy has to end, so we end up with these hybrid designs. --- End quote --- That the right way to use pass tube with solidstate driver circuit? |
| Yansi:
Follow here, some nice article about twoob power supplies: http://www.angelfire.com/electronic/funwithtubes/bench_psu.html I almost got a thirst to cobble up some of these supplies and compare and test their performances against each other. |
| techman-001:
--- Quote from: ArthurDent on September 30, 2019, 04:36:25 pm ---T3sl4co1l - "No current limiting (aside from the impedance of the poor tube itself), and it'll explode if ever you should accidentally short the output." As I said, I made that supply 40 years ago and I'm still waiting for the 6BX7 tube to explode, maybe in 50 years.:-DD I've never ever seen a tube explode but I have seen some tube plates glow bright red. There is both a primary fuse and a 10 ohm resistor as protection in case you missed that. I also stated I wanted to build a supply out of parts I had in my junk box and I didn't intend to make a complicated supply that would have all the bells and whistles that my programmable precision bench supplies have today. You should be pleased I even put meters on the supply! 8) --- End quote --- That's a really nice schematic, it took me back 40 years ago as well. I've never seen a tube explode either and I've run them with red hot anodes for hours, I've had then bright blue inside and sparks flying everywhere (from massively positive grids) before they burnt out. Tubes are incredibly rugged, far more so than semiconductors. I've seen a few TV CRT's IMPLODE ......... after I threw a brick at them :clap: |
| floobydust:
--- Quote from: 001 on October 03, 2019, 07:38:07 pm ---Can You post schematics You told (and built)? --- End quote --- You'll have to decide if you want to use vacuum tubes or solid-state, or a mix of both. Here are scans of classic, all-tube voltage regulator circuits from some GE and RCA databooks I have. I used the GE circuit with an extra RC filter after the VR tube to filter noise, as gas tubes are noisier than zeners. The RCA one has 0.1% load and line regulation with 0-225mA. The Compactron circuit is very cheap using a neon lamp as the reference. The architecture is very basic and anything can replaced by solid-state components. It's whatever you like. Add some op-amps if you want better performance and more parts and have lots of money. The hardest part is the pass transistor or mosfet, if you use one. They need a lot of protection for high voltage linear use. If your load has big capacitance 100's of uF like some audio circuits use, it will blow the transistor/mosfet on power up. Too much inrush current for too long. |
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