Electronics > Projects, Designs, and Technical Stuff

It looks for me as stupid schematic (Oldtimers welcome!)

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Yansi:
R1 in the first schematic above is not placed the best. Shall be going from the cathode of the pass tube, not anode. This way, you can get better regulation.

In the second schematic you can get rid of OB3 completely, not necessary as you can reference cathode of 6SJ7 to the output minus terminal and the bottom of the feedback divider to the negative reference voltage.

001:

--- Quote from: floobydust on October 05, 2019, 05:54:35 am ---
--- Quote from: 001 on October 03, 2019, 07:38:07 pm ---Can You post schematics  You told (and built)?

--- End quote ---

Here are scans of classic, all-tube voltage regulator circuits from some GE and RCA databooks I have.

--- End quote ---

Thanx You a lot! Great work  :-+ :-+ :-+ :-+


--- Quote from: Yansi on October 05, 2019, 09:47:09 am ---R1 in the first schematic above is not placed the best. Shall be going from the cathode of the pass tube, not anode. This way, you can get better regulation. 

--- End quote ---

Hahah No way because it is variable REGULATOR

Yansi:
Hahaha, don't be silly. Couple days ago you did not have even slightest understanding how the circuit works.  Now trying to be smart, but still no, you have to learn more and harder.

Variable or not, the reference still can be supplied from the output. It all depends on many things.

floobydust:
In the second schematic, note the 6SJ7 screen is also regulated by the 0B3. This is favorable for better PSRR and line regulation.

In the first (Compactron) schematic, which is bare bones cheap, placing the VR tube at the output can add instability as an NE-2's dynamic impedance is not zero. Have to look if the VR ends up in-phase or out-of-phase with the pass tube, as far unexpected feedback in these circuits. I'm used to the VR tube being at the raw DC side, I thought it was to save 10's mA off the pass tube's load in the case of the big 0B2, 0B3.

Testing these circuits is a PITA, I used to use a scrap bin big 814 tetrode connected to a signal generator as a load. The workbench looked like Frankenstein's lab lol.

001:

--- Quote from: Yansi on October 05, 2019, 01:45:26 pm ---
Variable or not, the reference still can be supplied from the output.

--- End quote ---
Don`t be  @#^&&% please


--- Quote from: floobydust on October 05, 2019, 08:04:58 pm ---This is favorable for better PSRR and line regulation.

--- End quote ---

Thanx a lot for Your posting  :-+
Is it good idea to replace  ONLY diver tube (6AU6/6SJ7 etc)  with some transistor(s)? What the way to do it right?

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