VFD Graphics EQ

My VFD graphic EQ was built to satisfy my need to use a VFD. It was my first VFD project. It was not an easy build for these reasons: the case I chose was to small for all the circuit; the datasheet for the LC7566 was in Japanese or Chinese, I only speak English and nether the chip or the VFD fitted the breadboard.

It was another device salvaged off an old hifi, I even got another VFD and its driver chip.

Some how through pure guess work and a datasheet of a similar chip I was able to decipher the LC7566 datasheet; I then built an adapter for the VFD and soldered wires to the chips pins. The stuff that did not fit was glued to the outside.

There were not to many problems in prototyping and I used three small 12V battery's to power my device as I wanted it to be portable. I did not use an inverter circuit as the ones I built ether did not work, the voltage was to low or there was no current. So battery's it was.

Soldering the device was a challenge as all the pins had about a millimetre of space between and I even soldered two wires in backwards, I never corrected that. however the device worked.