Hi all,
I'm been having fun modding an old 7" B&W TV into a "wobblevision" oscilloscope as an on-stage visual effect as per
this thread.
I've left the vertical drive circuit intact, allowing me to control horizontal deflection through an audio input. This lets me get full deflection from a 1V-peak signal.
It's really cool but I'm wondering if there's a way I can better match an audio input to the impedance of the horizontal deflection coil. I expect an opamp-based buffer circuit would help here but I could use some advice on the specifics. Since others have used audio amp circuits for this purpose, I'm wondering if a simple LM386-based circuit would suffice. I mean, speakers have coils - and I want to drive a coil!
Many thanks for any help you can offer.
Best regards,
Iain