Electronics > Projects, Designs, and Technical Stuff
Low Cost Huntron 2000 - Circuits, Plans & Ideas!
Chris56000:
Hi!
The power supply and CRT driver circuits in my design are complete and I'm now waiting till pay–day to order the CRT, case, transformers and the voltage regulator modules I propose to use!
Can I use the transformer equation:–
Ep = 4.44 × f × B x A × Np
. . .with an Epcos N87 series transformer kit to make the signal–voltage transformer?
I presume the "area" parameter given by Epcos in their E32 series, etc., datasheets corresponds to 'A' in the basic transformer equation!
The transformer primary would be wound for 9.5V rms at 50Hz, then the primary volts needed for 400 & 2000Hz determined either from the transformer equation or by direct experiment.
Would I need to provide two primary taps, or is it simpler to adjust the oscillator voltage/power amp gain to give the same secondary outputs at 400Hz & 2000Hz?
Chris Williams
PS!
I forgot to mention – is 'A' in the transformer equation the effective c.s.a. of the core itself or the winding–space area, or the sum of both?
(It's forty years since I studied this in detail at college!)
schmitt trigger:
I may be wrong, but those Epcos cores may not have sufficient window area to wind the required amount turns for such large applied volt-seconds.
A salvaged steel-core audio transformer, with a turns adjustment, may do the trick.
Or if you have access to high grade silicon steel, like an M6 or M5, you could design your own.
And drive it with any audio power amp IC.
fastguido:
I am designing a DIY Huntron too , but I am starting with the guts of an old Heathkit 3" CRT vector monitor for the CRT portion( I like CRT's). I am going to use a MPU to replace the Huntron logic portion. Why can't you use an audio amp IC (i.e. LM 3875 or something similar ) with a > +/-30 volt supply to get a 60v pk-pk output instead of a transformer , it would seem that you would have voltage available since you are using a CRT with it associated power supply.
kripton2035:
although I understand some can prefer a crt display for a component tester, I'm planning to make one with a good lcd display, to make things more modern !
2N3055:
Audio trafo for 100V PA speaker might do the trick..
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