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Electronics Forum / Electronics / March 2006May 1972 ETI sound operated flash
I have a sound operated camera flash circuit that I built in the 70's. It has the IC missing. I thought that it was built from an English Practical Electronics circuit, but the circuit appears very similar to the ETI 514B published in May 1976. It does have a few differences however. Does anyone have the May 1972 ETI that published the original ETI 514? "Ralph" >I have a sound operated camera flash circuit that I built in the 70's. > It has the IC missing. > I thought that it was built from an English Practical Electronics circuit, > but the circuit appears very similar to the ETI 514B published in May > 1976. It does have a few differences however. > Does anyone have the May 1972 ETI that published the original ETI 514? ** If the IC has 8 pins, I bet it is an LM301A. The dudes at ETI were besotted with them in the early '70s. Still an impressive device. ....... Phil Wrong guess Phil I have the mag, it was a 741. Russell > "Ralph" > >I have a sound operated camera flash circuit that I built in the 70's. [quoted text clipped - 11 lines] > > ....... Phil "Russ_Verdon" > Wrong guess Phil > > I have the mag, it was a 741. ** Ok - so they were slumming it that day .... Pukes ..... ........ Phil Thanks to Russ, I can state that the 514 used the 741 and the latter 514B used the 301, as Phil guessed. Ralph > "Russ_Verdon" >> [quoted text clipped - 7 lines] > > ........ Phil > Thanks to Russ, I can state that the 514 used the 741 and the latter 514B > used the 301, as Phil guessed. > Ralph Phil appears to be good at that (guessing that is). :P Pity his guessing (mostly incorrect) extends beyond the sphere of electronics into other areas of which he has absolutely no knowledge or expertise. Cheers, Alan >> "Russ_Verdon" >>> [quoted text clipped - 7 lines] >> >> ........ Phil "Ralph" > Thanks to Russ, I can state that the 514 used the 741 and the latter 514B > used the 301, as Phil guessed. ** That was no mere "guess". I built a 514B back in 1976. Took a nice pic of a yellow balloon bursting with my Pentax KX. ....... Phil > Thanks to Russ, I can state that the 514 used the 741 and the latter > 514B used the 301, as Phil guessed. LOL, so they *were* slumming it that day! GB  Signature"Men will never be free until the last king is strangled with the entrails of the last priest." (Diderot, paraphrasing Meslier) |
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