I gave up 7-seg VFD but completed by another VFD!

A project log for Vacuum tube game in 21st century

Playing vacuum tube is not so difficult as expected. Let's play great heritage of human being by modern technology!

kodera2tkodera2t 07/10/2019 at 12:022 Comments

As presented in my previous log, I've tried audio amplifier implementation, and after prototyping I moved to "tiny production" for tindie. HOWEVER, tight soldering to PCB (prototyping stage, it was tentative) leads to un-solvable ultra strong microphonic making ultra loud howling through speaker-tube feedback. I've tried several material attachment to VFD to reduce feedback, but sometimes it is succeeded but another day it goes super howling. Eventually I gave up this game. The 7-seg VFD does not have any responsibility because they are made for "digit display". Fortunately I have another VFD display, DM160. It is not segment one but its "audio application" is far stable and reliable, and also characteristic variation is very small between devices. So I changed tube from 7-seg to DM160.

Actual operation is presented in the following movie. One additional function of this new amplifier is "power-on speaker pop canceling". You will see "zero pop" for power on in the following movie..


Paul Andrews wrote 11/30/2021 at 01:03 point

I would love to have - or make - one of these

  Are you sure? yes | no

Ken Yap wrote 07/10/2019 at 12:15 point

That has to be the smallest vacuum tube I've ever seen.

  Are you sure? yes | no