Rebuilding my old analog console

[laserist]

Laserist: truly hoping I'm not in the second category.

I bought a signal generator . Never owned one before. I'm thinking I can play around with different wave forms as the AM signal for the AD633s.

I think you're safe...

Ivan told a story about the early days of Laserium where they used a couple of old army surplus signal generators to do Danube's lissijous figures. There was a rumor before a show that Patty Hurst had been seen in the park. So when a capacitor in one of the signal generators went "bang" everyone hit the floor thinking it was a shoot out between the FBI and the SLA.

I'm sure somebody makes a digital to analog converter for your Raspberry Pi. You can always write one. With an analog to digital converter & a pot you'd ever be able to play it.

[lasermaster1977]

Kevint, a very useful multi-function waveform generator is the XR2206. Useful for Sine, Triangle, Square, Ramp waveform generator.

https://www.jameco.com/z/XR2206CP-EX...hoCT7oQAvD_BwE

XR2206.pdf

XR2206-Applications .pdf

[DZ]

DZ: Thanks for the offer. What's the frequency range of the envelope generator of the AM? Can it go down to 0.1Hz for a very slow ramp?

I have different timing caps on the pair of LFO's that I use in my console. LFO1 runs from about .5Hz to around 100Hz and LFO2 runs from about 2Hz to around 250Hz (IIRC). I also use the LFO's to drive frequency modulation, which can get interesting from time to time! I shot a quick video of using the LFO's with a VCQO for AM:

[Kevint]

Laserist: LOL! Thanks for sharing the story. I pray mine doesn't do that. But knowing me, it a possibility. I have been known to reverse voltage polarity and short things out every once in a while.

Lasermaster1977: that looks like a great build design and all the parts are available. Definitely something to consider.

DZ: WOW! That video was awesome! It shows the AM ramp effect and a whole lot more. I would be very interested in the unpopulated boards.

[dchammonds]

Ah ha, found it. It is quite similar to this one from Walter Jung's "IC op-amp Cookbook" here:

Attachment 61026

Thanks @Kevint

I remember borrowing that book long ago- would love to have a copy now.

[lasermaster1977]

I remember borrowing that book long ago- would love to have a copy now.

There is one here: https://www.ebay.com/itm/143446907675

[Kevint]

Woo-hoo! AD633s

[Kevint]

Life is GOOD!

For the most part - IT'S WORKING!

[ronhip]

I think you're safe...

Ivan told a story about the early days of Laserium where they used a couple of old army surplus signal generators to do Danube's lissijous figures. There was a rumor before a show that Patty Hurst had been seen in the park. So when a capacitor in one of the signal generators went "bang" everyone hit the floor thinking it was a shoot out between the FBI and the SLA.

I'm sure somebody makes a digital to analog converter for your Raspberry Pi. You can always write one. With an analog to digital converter & a pot you'd ever be able to play it.

Here's an early photo of Charlie and Ivan with VERY early synthesizer equipment under the platform at Griffith.

[lasermaster1977]

Here's an early photo of Charlie and Ivan with VERY early synthesizer equipment under the platform at Griffith.

Great photo, thanks for sharing! Look at those long, long slide pots.