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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


    ** 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.

  4. Phil Allison

    Phil Allison Guest


    ** 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.
  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

  7. Phil Allison

    Phil Allison Guest


    ** 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!

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