Rebuilding my old analog console

[Kevint]

Awesome. Thanks for the advice. I can shift the phase on the square wave. I'll give that a try this weekend. My parts order from Mouser will arrive tomorrow. I ran out of trimpots to build the 3rd channel on the scan amp. Hoping for good results this weekend .

[Kevint]

Thanks, but I really can't take the credit for developing the board. The front end (feedback portion) is basically the LM22SDA and the back end is the open loop amp I am using based on TIP41/42 transistors. What I can do, is piece things together, draw up schematics, layout a board, make them and do a little troubleshooting.

The really good news is the I got parts today, so the weekend is looking good.

[Kevint]

Those look great!. Really nice work.

[Kevint]

I'm alive.

Going to post some (what I think are some classic Laserium style) image examples.

Demonstrates: basic quadrature oscillators, VCA modulation, offset signal, z axis rotation, and blanking through diode laser modulation.

Give me a little time to get the videos converted and up. The videos are nothing special. My 3D printer is next to my workbench. It has dark glass sides and I noticed that the images looked better viewing the reflection then from directly on the wall. As a result the images are skewed but look better.

[Kevint]

Here are some videos.

[Kevint]

Here is the first of six panel sections. I 3D printed the panel and knobs.

[lasermaster1977]

Here are some videos.

Very nice results Kevin! Congratulations on your hard work and efforts. Let's see some more when you have time.

[Kevint]

Here is another video

[Kevint]

Thank you so much Lasermaster for the encouragement. I've been racking my brain.

The biggest challenge is dealing with, how to balance the voltages when changing effects. For example, the AD633's drop the voltage so when you turn off the AM signal the image gets gigantic, or goes to zero depending on how they are hooked up. For the z-axis rotation when I turn off the rotation signal I have to ground one side or the image goes to zero. So, I'm trying to figure out how to wire all this stuff together so it interacts nicely.

If anyone has some advise on how to manage signal paths, that would be great.

[lasermaster1977]

Thank you so much Lasermaster for the encouragement. I've been racking my brain.

The biggest challenge is dealing with, how to balance the voltages when changing effects. For example, the AD633's drop the voltage so when you turn off the AM signal the image gets gigantic, or goes to zero depending on how they are hooked up. For the z-axis rotation when I turn off the rotation signal I have to ground one side or the image goes to zero. So, I'm trying to figure out how to wire all this stuff together so it interacts nicely.

If anyone has some advise on how to manage signal paths, that would be great.

Video 8 is really nice!

I know you've posted in early posts in this thread your PCB but do you have any specific schematics of your implementation to share? Or, maybe I missed it. There are lots of ways to 'skin this cat'.