May 1972 ETI sound operated flash

[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?

 

[Phil Allison]

"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

 

[Russ_Verdon]

Wrong guess Phil

I have the mag, it was a 741.

Russell

 

[Phil Allison]

"Russ_Verdon"

Wrong guess Phil

I have the mag, it was a 741.

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

Pukes .....




......... Phil

 

[Ralph]

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

 

[Alan Rutlidge]

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).
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

 

[Phil Allison]

"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

 

[GB]

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