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May 1972 ETI sound operated flash

Discussion in 'Hobby Electronics' started by Ralph, Mar 24, 2006.

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  1. Ralph

    Ralph Guest

    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?
     
  2. Phil Allison

    Phil Allison Guest

    "Ralph"

    ** 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
     
  3. Russ_Verdon

    Russ_Verdon Guest

    Wrong guess Phil

    I have the mag, it was a 741.

    Russell
     
  4. Phil Allison

    Phil Allison Guest

    "Russ_Verdon"

    ** Ok - so they were slumming it that day ....

    Pukes .....




    ......... Phil
     
  5. Ralph

    Ralph Guest

    Thanks to Russ, I can state that the 514 used the 741 and the latter 514B
    used the 301, as Phil guessed.
    Ralph
     
  6. 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
     
  7. Phil Allison

    Phil Allison Guest

    "Ralph"

    ** 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
     
  8. GB

    GB Guest

    LOL, so they *were* slumming it that day!

    GB
     
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