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

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Old 11th Jan 2019, 6:34 pm   #1
theredhouseinn
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Default Tubon hand held keyboard

Can anyone help me with a circuit diagram for a Tubon hand held keyboard type number IE50.
I have recapped it and checked all tr's and resistors.
It is making a noise and the keyboard works in changing the frequency of the sound.
It is not a sinewave o/p so any info on waveforms would be useful.
I have drawn out the cct of the pcb but it is strange territory for a vintage amp fixer like me.
John.
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Old 11th Jan 2019, 6:50 pm   #2
ms660
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Default Re: Tubon hand held keyboard

Is the schematic on this site any use?:

http://www.crazy-patroche.com/2015/1...-le-tubon.html

Lawrence.
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Old 12th Jan 2019, 3:00 pm   #3
theredhouseinn
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Default Re: Tubon hand held keyboard

Thanks Lawrence.
I had not found that site.
The pcb layout is different to my one.
There would appear to be several versions of the instrument.
John.
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