Analog Synth

The biggest electronic project I ever did. Actually, I started in 1980 but couldn't make the pcbs then. Retried in 2000, and this time I didn't give up...
There will be detailed descriptions and schematics of the modules as soon as I have the time.
#1
The beginning. I'd like to add an article about the making of PCBs... (some day)
#2
The basic rack and the power supply.
#3
Rear view. You can see the transformer, the master volume pot, mute switch and the headphone jack.
#4
From now on you can call it a synth: In/Out panel, oscillator #1, test keyboard; the module in front is an ADSR envelope plus a exponential VCA.
#5
Same as above with the ADSR/VCA built in and a beautiful red trigger switch in front.
#6
The filter. On the right side of the board you can see the famous transistor ladder (thank you, B.M.!), on the left there is another ADSR.
#7
The filter is in. But will it work?
#8
My workbench. Just testing the filter module.
#9
Basic synth with 1 oscillator, 1 filter, 1 VCA and two envelopes.
#10
Rear view, with connections to the patch bay.
#11
Oscillator #2
#12
The mixer and the ring modulator, plus an envelope follower for the external input.
#13
Growing. Still some space in there.
#14
Different point of view.
#15
Needs a bigger power supply. The 3 oscillator chip heatings are eating all the current.
#16
The bigger transformer causes hum in the VCA. Built an external power supply.
#17
What to do with the empty space: Two separate 4-stage frequency dividers and fixed filter banks, two additional LFOs and linear VCAs.
#18
Front view of upper rack. 70's organ switches for frequency dividers and fixed filters.
#19
OK. I did my best to put in as much as possible.
#20
Ta-dah!
#21
Nice photo for the brochure, huh?
accessories
Indispensable needful things.
accessories
More I.N.T. Also see The Moog Archives (menu "Oddities")