I am working on making a flyback driver with a 555 timer. The only part I need is a MOSFET power transistor. I am wondering is it possible to substitute a triode vaccum tube (14GT8) for the MOSFET?
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4\$\begingroup\$ The humor of driving a vacuum tube with a 555 has not been lost on me. \$\endgroup\$– user3624Sep 20, 2012 at 2:59
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1\$\begingroup\$ It is interesting that so far you have not accepted a single answer. Do none of the answers to your questions you received so far solve your problems? \$\endgroup\$– AndrejaKoSep 20, 2012 at 13:17
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1 Answer
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Please clarify whether you wish to use a MOSFET or a vacuum tube in the final design.
If you are looking at an older tube or an old circuit then the abbreviation 14GTB may have been used for a range of vacuum tubes.
G T B = Glass, tubular, version B (as opposed to GTA = version A)
so GTB on the end does not tell you a lot about the tube's functionality.
Do you have a circuit diagram?
Please provide more details.
MOSFET in place of a vacuum tube:
BUT, yes, if you want to use a MOSFET in place of a vacuum tube (in old equipment or using a very old circuit) and you want to drive it with a 555 to make a flyback driver you can do so, subject to getting a MOSFET that meets the circuit needs. The MOSFET would need a high enough voltage rating to survive the inductive peak on its drain during flyback, and it needs a high enough current rating to meet the circuit's design. You will need to use an N Channel MOSFET to get the polarity correct.
Vacuum tube in place of a MOSFET:
If you want to use a vacuum tube in place of a MOSFET it MAY be possible but will need good design knowledge as VT's are somewhat harder devices to drive. (Correct grid biases, limited current, higher voltages, heaters, ...).
Related:
answered Sep 20, 2012 at 2:23