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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 6th Aug 2021, 12:35 pm   #41
Cobaltblue
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Default Re: 1970s disco light displays

My TUAC one surfaced its from around 1983

Cheers

Mike T
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Old 7th Aug 2021, 5:21 pm   #42
robinshack
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Default Re: 1970s disco light displays

Following correspondence with Malcolm, I attach my two pdf of the article refererred to in post #2.
Credit to Symon, Philips210 for providing the information in the first place for my initial request.
This is the PW one I built back in the early 70s, as a stereo version with the dimming circuit added.
The bass/mid/treble filter controls work extremely well and enable the sound heard to relate to the light displayed.
NOTE. Part 4, last paragraph refers to a couple of minor errors within Fig. 9 in the first pdf.
Be interested if anyone actually builds this?
Mine, being stereo and including the dimmer facility as well, all built on veroboard is quite a beast!
Rob
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File Type: pdf Sound to light parts 1 to 3.pdf (3.46 MB, 20 views)
File Type: pdf Sound to light Part 4.pdf (1.49 MB, 9 views)
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Old 7th Aug 2021, 8:33 pm   #43
Valvepower
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Default Re: 1970s disco light displays

Hello,

Pictures attached...

Please can I throw into the mix the sound to light unit from the 1974 Practical Wireless. I built this one in the days of doing social club discos and playing George McCrae, Rock Your Baby and Higher Ground, Stevie Wonder and trying to impress the girls with the slick DJ stylee and failing quite miserably! From memory it used a “backwards” connected LT transformer to trigger the TRIAC.

The other is the ETI disco project from 1976 (sorry for the upside down scans). The company I was working for at the time in Southend in the mid/latter part of the 70’s made the cabinet for Maplin. We cribbed the amplifier module/circuit and we modified it to drive 2SD424’s in Quasi-Complimentary instead of the 2N3055/MJ2955 as they kept blowing.

….Good days

Terry
Attached Files
File Type: pdf PW-Light-1974-06.pdf (434.3 KB, 28 views)
File Type: pdf ETI_Light_00.pdf (1.58 MB, 20 views)
File Type: pdf ETI_Light_01.pdf (1.40 MB, 21 views)
File Type: pdf ETI_Light_02.pdf (1.28 MB, 14 views)
File Type: pdf ETI_Light_03.pdf (1.41 MB, 18 views)

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Old 8th Aug 2021, 8:05 am   #44
Trevor
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Default Re: 1970s disco light displays

I built the early practical wireless sound to light in the mid 70,s it worked quite well !
This a described used a small valve type output transformer from RS
Trev
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Old 9th Aug 2021, 7:25 pm   #45
Malcolm T
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Default Re: 1970s disco light displays

So quite a simple circuit really for each channel to switch the live to the lamp multiplied several times per lamp.
Thanks for the pdf ,s. and the articles.
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