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Strobe light: NEON to LED conversion on (Sony) turntables

Harolda

Harolda

Well-Known Member
Who has experience on the NEON to LED conversion for the strobe light on (especially) Sony turntables like a PS8750, PS6750, TTS8000 etc?

To my opinion there are a few options:
  • Integrating the LED circuit in the exsiting high voltage section of the NEON lamp
  • Modify the existing high voltage section to a low voltage section for driving the LED's
  • Use a seperate quartz driven led strobe circuit with it's own PSU.
I am looking to do this on a TTS8000 that already uses a quartz driven circuit to derive the 60Hz (or 120Hz) for the strobe lamp independent of the power line frequency. The other deck is a TTS4000/PSE4000 that uses the line frequency (50Hz or 60HZ) to drive a high voltage neon lamp.

The latter has a defect lamp and i have to do a conversion and already thinking of a seperate quartz controlled circuit for the led strobe. The TTS8000 lamp functions but gives a buzzing/whining noise so i think it is close to giving up. The complete circuit of the tts8000 has been restored with new components etc, also on the high voltage section.

thanks for the response and ideas.


regards
 
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Measure the voltage at the transformer secondary, do the conversion from AC rms to get the DC voltage, then run an LED off this with a diode to give you unsmoothed DC and the 50/60Hz "flicker" that the strobe needs. What's the AC voltage and frequency in the Netherlands? 220V and 50Hz?

Lee.

P.S. Is that Phillips building still there that looks like a flying saucer?
 
leesonic said:
Measure the voltage at the transformer secondary
Lee.
Click to expand...
Note that this will only work if the original neon bulb is driven directly from the power transformer. I have seen some higher end quartz lock turntables which drive it from their internal oscillator. The giveaway is that the latter will only have 1 or 2 strobe patterns instead of the more normal 4 (2 for 60 Hz. and 2 for 50 Hz.for 33 and 45 speeds). The fancy electronics changes the oscillator frequency to flash at the correct rate depending on the line frequency and the speed chosen.
Rick
 
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