With 240V mains and no load the mains Tx is saturating with , not too intrusive laminations buzz, with a current draw of .34 amps , normal? Tx seems adequate size for this combo In for "stuck" tuner display. One LED solder bridge from manufacture, cannot ever have displayed, must have eventually draggged down 74HCT595 and now all LED are on for flat/sharp section, other section , main scale note DISPLAY , and its 595 working .
just about to order some ( minimum order constraints) 74HCT595 and I noticed it is actually 74AHCT595 perhaps I will try a repinned 74HC4094 that I have laying around
How is the 74HCT595 used? We used them as parallel output latches and cascaded them for more outputs. That will be a lot of work to avoid a 40 cent part. The stobe polarity is inverted, and the timing is different. Look at the datasheets.
-- You can't have a sense of humor, if you have no sense.
noticed
have
I'm more concerned about the 1/3 amp of current of saturation , checked with the secondaries disconnected. Such equipment would have been condemned where I used to work, but I assume anything goes these days, made for UK with 230V on the rating plate. Does this sort of thing come into CE compliance? backhanders from the utility companies to increase consumption ?
I confirmed the SD-IN is valid , lashing up a 4015 and will probably get some HCT595 as there seems just one seriously over-priced supplier in the uk of AHCT595. Probably Fender having a job lot of the HCT rather than some on-the-edge of envelope AHCT spec requirement for this use. But as a backstop I now know the central in-tune LED only is an option with a 4015, without the flat and sharp direction LEDs. The main scale note LEDs are driven from another 595
worked with a 74HC595 replacement for the 74AHCT595
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