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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